Add ffmpeg progress tracking to FFmpegFD

Add ffmpeg progress tracking to FFmpegPostProcessor

Apply changes from the code review

Fix a bug where the subprocess didn't capture any output thus an empty stdout and stderr were sent back

Add missing hooks

Revert "Add missing hooks"

This reverts commit a359c5ea10bb35b965e80801e736f43cdbcf3294.

Add support of -ss=132 timestamp format

Infer filename from ffmpeg args instead of info_dic

Remove redundant parenthesis and switch from to_stodout to to_screen

Add info kwarg with multiple files and ffmpeg to track progress

Moved format progress function to util

Moved format progress function to util

Add progress tracking to postprocessing operations

Fix typing error

Handle self._downloader is None at __init__

Move format progress functions to utils

Move format progress functions to utils

Handle case where ydl passed is None

Handle case where ydl passed is None

Handle case where _multiline isn't initialized

Handle case where _multiline isn't initialized

Fix streams incorrectly returned

Fix case where ydl is nested in the downloader

Add progress_hook attribute

Fix bug after merge

Fix import bugs after merge

Catch up with upstream

Fix merge errors #1

Adapt tests and implementatation for ffmpeg progress tracking args

test/test_downloader_external.py

@@ -120,19 +120,22 @@ def test_make_cmd(self):
             downloader._call_downloader('test', {**TEST_INFO, 'ext': 'mp4'})
             self.assertEqual(self._args, [
                 'ffmpeg', '-y', '-hide_banner', '-i', 'http://www.example.com/',
-                '-c', 'copy', '-f', 'mp4', 'file:test'])
+                '-c', 'copy', '-f', 'mp4', 'file:test', '-progress', 'pipe:1'])
 
             # Test cookies arg is added
             ydl.cookiejar.set_cookie(http.cookiejar.Cookie(**TEST_COOKIE))
             downloader._call_downloader('test', {**TEST_INFO, 'ext': 'mp4'})
             self.assertEqual(self._args, [
-                'ffmpeg', '-y', '-hide_banner', '-cookies', 'test=ytdlp; path=/; domain=.example.com;\r\n',
+                'ffmpeg', '-y', '-hide_banner', '-cookies',
-                '-i', 'http://www.example.com/', '-c', 'copy', '-f', 'mp4', 'file:test'])
+                'test=ytdlp; path=/; domain=.example.com;\r\n', '-i',
+                'http://www.example.com/', '-c', 'copy', '-f', 'mp4',
+                'file:test', '-progress', 'pipe:1'])
 
             # Test with non-url input (ffmpeg reads from stdin '-' for websockets)
             downloader._call_downloader('test', {'url': 'x', 'ext': 'mp4'})
             self.assertEqual(self._args, [
-                'ffmpeg', '-y', '-hide_banner', '-i', 'x', '-c', 'copy', '-f', 'mp4', 'file:test'])
+                'ffmpeg', '-y', '-hide_banner', '-i', 'x', '-c', 'copy', '-f',
+                'mp4', 'file:test', '-progress', 'pipe:1'])
 
 
 if __name__ == '__main__':

yt_dlp/downloader/common.py

@@ -15,6 +15,7 @@
 from ..utils import (
     IDENTITY,
     NO_DEFAULT,
+    FormatProgressInfos,
     LockingUnsupportedError,
     Namespace,
     RetryManager,
@@ -25,11 +26,9 @@
     format_bytes,
     join_nonempty,
     parse_bytes,
-    remove_start,
     sanitize_open,
     shell_quote,
     timeconvert,
-    timetuple_from_msec,
     try_call,
 )
 
@@ -115,56 +114,6 @@ def to_screen(self, *args, **kargs):
     def FD_NAME(cls):
         return re.sub(r'(?<=[a-z])(?=[A-Z])', '_', cls.__name__[:-2]).lower()
 
-    @staticmethod
-    def format_seconds(seconds):
-        if seconds is None:
-            return ' Unknown'
-        time = timetuple_from_msec(seconds * 1000)
-        if time.hours > 99:
-            return '--:--:--'
-        return '%02d:%02d:%02d' % time[:-1]
-
-    @classmethod
-    def format_eta(cls, seconds):
-        return f'{remove_start(cls.format_seconds(seconds), "00:"):>8s}'
-
-    @staticmethod
-    def calc_percent(byte_counter, data_len):
-        if data_len is None:
-            return None
-        return float(byte_counter) / float(data_len) * 100.0
-
-    @staticmethod
-    def format_percent(percent):
-        return '  N/A%' if percent is None else f'{percent:>5.1f}%'
-
-    @classmethod
-    def calc_eta(cls, start_or_rate, now_or_remaining, total=NO_DEFAULT, current=NO_DEFAULT):
-        if total is NO_DEFAULT:
-            rate, remaining = start_or_rate, now_or_remaining
-            if None in (rate, remaining):
-                return None
-            return int(float(remaining) / rate)
-
-        start, now = start_or_rate, now_or_remaining
-        if total is None:
-            return None
-        if now is None:
-            now = time.time()
-        rate = cls.calc_speed(start, now, current)
-        return rate and int((float(total) - float(current)) / rate)
-
-    @staticmethod
-    def calc_speed(start, now, bytes):
-        dif = now - start
-        if bytes == 0 or dif < 0.001:  # One millisecond
-            return None
-        return float(bytes) / dif
-
-    @staticmethod
-    def format_speed(speed):
-        return ' Unknown B/s' if speed is None else f'{format_bytes(speed):>10s}/s'
-
     @staticmethod
     def format_retries(retries):
         return 'inf' if retries == float('inf') else int(retries)
@@ -343,18 +292,16 @@ def with_fields(*tups, default=''):
                     return tmpl
             return default
 
-        _format_bytes = lambda k: f'{format_bytes(s.get(k)):>10s}'
-
         if s['status'] == 'finished':
             if self.params.get('noprogress'):
                 self.to_screen('[download] Download completed')
             speed = try_call(lambda: s['total_bytes'] / s['elapsed'])
             s.update({
                 'speed': speed,
-                '_speed_str': self.format_speed(speed).strip(),
+                '_speed_str': FormatProgressInfos.format_speed(speed).strip(),
-                '_total_bytes_str': _format_bytes('total_bytes'),
+                '_total_bytes_str': format_bytes(s.get('total_bytes')),
-                '_elapsed_str': self.format_seconds(s.get('elapsed')),
+                '_elapsed_str': FormatProgressInfos.format_seconds(s.get('elapsed')),
-                '_percent_str': self.format_percent(100),
+                '_percent_str': FormatProgressInfos.format_percent(100),
             })
             self._report_progress_status(s, join_nonempty(
                 '100%%',
@@ -367,16 +314,16 @@ def with_fields(*tups, default=''):
             return
 
         s.update({
-            '_eta_str': self.format_eta(s.get('eta')).strip(),
+            '_eta_str': FormatProgressInfos.format_eta(s.get('eta')),
-            '_speed_str': self.format_speed(s.get('speed')),
+            '_speed_str': FormatProgressInfos.format_speed(s.get('speed')),
-            '_percent_str': self.format_percent(try_call(
+            '_percent_str': FormatProgressInfos.format_percent(try_call(
                 lambda: 100 * s['downloaded_bytes'] / s['total_bytes'],
                 lambda: 100 * s['downloaded_bytes'] / s['total_bytes_estimate'],
                 lambda: s['downloaded_bytes'] == 0 and 0)),
-            '_total_bytes_str': _format_bytes('total_bytes'),
+            '_total_bytes_str': format_bytes(s.get('total_bytes')),
-            '_total_bytes_estimate_str': _format_bytes('total_bytes_estimate'),
+            '_total_bytes_estimate_str': format_bytes(s.get('total_bytes_estimate')),
-            '_downloaded_bytes_str': _format_bytes('downloaded_bytes'),
+            '_downloaded_bytes_str': format_bytes(s.get('downloaded_bytes')),
-            '_elapsed_str': self.format_seconds(s.get('elapsed')),
+            '_elapsed_str': FormatProgressInfos.format_seconds(s.get('elapsed')),
         })
 
         msg_template = with_fields(

yt_dlp/downloader/external.py

@@ -3,7 +3,6 @@
 import os
 import re
 import subprocess
-import sys
 import tempfile
 import time
 import uuid
@@ -11,7 +10,11 @@
 from .fragment import FragmentFD
 from ..compat import functools
 from ..networking import Request
-from ..postprocessor.ffmpeg import EXT_TO_OUT_FORMATS, FFmpegPostProcessor
+from ..postprocessor.ffmpeg import (
+    EXT_TO_OUT_FORMATS,
+    FFmpegPostProcessor,
+    FFmpegProgressTracker,
+)
 from ..utils import (
     Popen,
     RetryManager,
@@ -619,26 +622,23 @@ def _call_downloader(self, tmpfilename, info_dict):
 
         args = [encodeArgument(opt) for opt in args]
         args.append(encodeFilename(ffpp._ffmpeg_filename_argument(tmpfilename), True))
+        args += ['-progress', 'pipe:1']
         self._debug_cmd(args)
 
         piped = any(fmt['url'] in ('-', 'pipe:') for fmt in selected_formats)
-        with Popen(args, stdin=subprocess.PIPE, env=env) as proc:
+        self._debug_cmd(args)
+        ffmpeg_progress_tracker = FFmpegProgressTracker(info_dict, args, self._ffmpeg_hook)
+        proc = ffmpeg_progress_tracker.ffmpeg_proc
         if piped:
             self.on_process_started(proc, proc.stdin)
-            try:
+        _, _, return_code = ffmpeg_progress_tracker.run_ffmpeg_subprocess()
-                retval = proc.wait()
+        return return_code
-            except BaseException as e:
+
-                # subprocces.run would send the SIGKILL signal to ffmpeg and the
+    def _ffmpeg_hook(self, status, info_dict):
-                # mp4 file couldn't be played, but if we ask ffmpeg to quit it
+        status['downloaded_bytes'] = status.get('outputted', 0)
-                # produces a file that is playable (this is mostly useful for live
+        if status.get('status') == 'ffmpeg_running':
-                # streams). Note that Windows is not affected and produces playable
+            status['status'] = 'downloading'
-                # files (see https://github.com/ytdl-org/youtube-dl/issues/8300).
+        self._hook_progress(status, info_dict)
-                if isinstance(e, KeyboardInterrupt) and sys.platform != 'win32' and not piped:
-                    proc.communicate_or_kill(b'q')
-                else:
-                    proc.kill(timeout=None)
-                raise
-            return retval
 
 
 class AVconvFD(FFmpegFD):

yt_dlp/downloader/http.py

@@ -11,6 +11,7 @@
 )
 from ..utils import (
     ContentTooShortError,
+    FormatProgressInfos,
     RetryManager,
     ThrottledDownload,
     XAttrMetadataError,
@@ -293,11 +294,11 @@ def retry(e):
                 before = after
 
                 # Progress message
-                speed = self.calc_speed(start, now, byte_counter - ctx.resume_len)
+                speed = FormatProgressInfos.calc_speed(start, now, byte_counter - ctx.resume_len)
                 if ctx.data_len is None:
                     eta = None
                 else:
-                    eta = self.calc_eta(start, time.time(), ctx.data_len - ctx.resume_len, byte_counter - ctx.resume_len)
+                    eta = FormatProgressInfos.calc_eta(start, time.time(), ctx.data_len - ctx.resume_len, byte_counter - ctx.resume_len)
 
                 self._hook_progress({
                     'status': 'downloading',

yt_dlp/downloader/rtmp.py

@@ -5,6 +5,7 @@
 
 from .common import FileDownloader
 from ..utils import (
+    FormatProgressInfos,
     Popen,
     check_executable,
     encodeArgument,
@@ -50,8 +51,8 @@ def run_rtmpdump(args):
                             resume_percent = percent
                             resume_downloaded_data_len = downloaded_data_len
                         time_now = time.time()
-                        eta = self.calc_eta(start, time_now, 100 - resume_percent, percent - resume_percent)
+                        eta = FormatProgressInfos.calc_eta(start, time_now, 100 - resume_percent, percent - resume_percent)
-                        speed = self.calc_speed(start, time_now, downloaded_data_len - resume_downloaded_data_len)
+                        speed = FormatProgressInfos.calc_speed(start, time_now, downloaded_data_len - resume_downloaded_data_len)
                         data_len = None
                         if percent > 0:
                             data_len = int(downloaded_data_len * 100 / percent)

yt_dlp/postprocessor/common.py

@@ -1,15 +1,27 @@
 import functools
 import json
 import os
+import sys
 
+from ..minicurses import (
+    BreaklineStatusPrinter,
+    MultilineLogger,
+    MultilinePrinter,
+    QuietMultilinePrinter,
+)
 from ..networking import Request
 from ..networking.exceptions import HTTPError, network_exceptions
 from ..utils import (
+    FormatProgressInfos,
+    Namespace,
     PostProcessingError,
     RetryManager,
     _configuration_args,
     deprecation_warning,
     encodeFilename,
+    format_bytes,
+    join_nonempty,
+    try_call,
 )
 
 
@@ -56,7 +68,9 @@ def __init__(self, downloader=None):
         self._progress_hooks = []
         self.add_progress_hook(self.report_progress)
         self.set_downloader(downloader)
+        self._out_files = self.set_out_files()
         self.PP_NAME = self.pp_key()
+        self._prepare_multiline_status()
 
     @classmethod
     def pp_key(cls):
@@ -102,6 +116,11 @@ def get_param(self, name, default=None, *args, **kwargs):
             return self._downloader.params.get(name, default, *args, **kwargs)
         return default
 
+    def set_out_files(self):
+        if not self._downloader:
+            return None
+        return getattr(self._downloader, '_out_files', None) or self._downloader.ydl._out_files
+
     def set_downloader(self, downloader):
         """Sets the downloader for this PP."""
         self._downloader = downloader
@@ -173,25 +192,116 @@ def add_progress_hook(self, ph):
         # See YoutubeDl.py (search for postprocessor_hooks) for a description of this interface
         self._progress_hooks.append(ph)
 
-    def report_progress(self, s):
+    def report_destination(self, filename):
-        s['_default_template'] = '%(postprocessor)s %(status)s' % s
+        """Report destination filename."""
-        if not self._downloader:
+        self.to_screen('[processing] Destination: ' + filename)
-            return
+
+    def _prepare_multiline_status(self, lines=1):
+        if self._downloader:
+            if self._downloader.params.get('noprogress'):
+                self._multiline = QuietMultilinePrinter()
+            elif self._downloader.params.get('logger'):
+                self._multiline = MultilineLogger(self._downloader.params['logger'], lines)
+            elif self._downloader.params.get('progress_with_newline'):
+                self._multiline = BreaklineStatusPrinter(self._downloader._out_files.out, lines)
+            elif hasattr(self._downloader, "_out_files"):
+                self._multiline = MultilinePrinter(self._downloader._out_files.out, lines, not self._downloader.params.get('quiet'))
+            else:
+                self._multiline = MultilinePrinter(sys.stdout, lines, not self._downloader.params.get('quiet'))
+            self._multiline.allow_colors = self._multiline._HAVE_FULLCAP and not self._downloader.params.get('no_color')
+        else:
+            self._multiline = MultilinePrinter(sys.stdout, lines, True)
+            self._multiline.allow_colors = self._multiline._HAVE_FULLCAP
+
+    def _finish_multiline_status(self):
+        self._multiline.end()
+
+    ProgressStyles = Namespace(
+        processed_bytes='light blue',
+        percent='light blue',
+        eta='yellow',
+        speed='green',
+        elapsed='bold white',
+        total_bytes='',
+        total_bytes_estimate='',
+    )
+
+    def _report_progress_status(self, s, default_template):
+        for name, style in self.ProgressStyles.items_:
+            name = f'_{name}_str'
+            if name not in s:
+                continue
+            s[name] = self._format_progress(s[name], style)
+        s['_default_template'] = default_template % s
 
         progress_dict = s.copy()
         progress_dict.pop('info_dict')
         progress_dict = {'info': s['info_dict'], 'progress': progress_dict}
 
-        progress_template = self.get_param('progress_template', {})
+        progress_template = self._downloader.params.get('progress_template', {})
-        tmpl = progress_template.get('postprocess')
+        self._multiline.print_at_line(self._downloader.evaluate_outtmpl(
-        if tmpl:
+            progress_template.get('process') or '[processing] %(progress._default_template)s',
-            self._downloader.to_screen(
+            progress_dict), s.get('progress_idx') or 0)
-                self._downloader.evaluate_outtmpl(tmpl, progress_dict), quiet=False)
-
         self._downloader.to_console_title(self._downloader.evaluate_outtmpl(
-            progress_template.get('postprocess-title') or 'yt-dlp %(progress._default_template)s',
+            progress_template.get('download-title') or 'yt-dlp %(progress._default_template)s',
             progress_dict))
 
+    def _format_progress(self, *args, **kwargs):
+        return self._downloader._format_text(
+            self._multiline.stream, self._multiline.allow_colors, *args, **kwargs)
+
+    def report_progress(self, s):
+        def with_fields(*tups, default=''):
+            for *fields, tmpl in tups:
+                if all(s.get(f) is not None for f in fields):
+                    return tmpl
+            return default
+
+        if not self._downloader:
+            return
+
+        if s['status'] == 'finished':
+            if self._downloader.params.get('noprogress'):
+                self.to_screen('[processing] Download completed')
+            speed = try_call(lambda: s['total_bytes'] / s['elapsed'])
+            s.update({
+                'speed': speed,
+                '_speed_str': FormatProgressInfos.format_speed(speed).strip(),
+                '_total_bytes_str': format_bytes(s.get('total_bytes')),
+                '_elapsed_str': FormatProgressInfos.format_seconds(s.get('elapsed')),
+                '_percent_str': FormatProgressInfos.format_percent(100),
+            })
+            self._report_progress_status(s, join_nonempty(
+                '100%%',
+                with_fields(('total_bytes', 'of %(_total_bytes_str)s')),
+                with_fields(('elapsed', 'in %(_elapsed_str)s')),
+                with_fields(('speed', 'at %(_speed_str)s')),
+                delim=' '))
+
+        if s['status'] != 'processing':
+            return
+
+        s.update({
+            '_eta_str': FormatProgressInfos.format_eta(s.get('eta')),
+            '_speed_str': FormatProgressInfos.format_speed(s.get('speed')),
+            '_percent_str': FormatProgressInfos.format_percent(try_call(
+                lambda: 100 * s['processed_bytes'] / s['total_bytes'],
+                lambda: 100 * s['processed_bytes'] / s['total_bytes_estimate'],
+                lambda: s['processed_bytes'] == 0 and 0)),
+            '_total_bytes_str': format_bytes(s.get('total_bytes')),
+            '_total_bytes_estimate_str': format_bytes(s.get('total_bytes_estimate')),
+            '_processed_bytes_str': format_bytes(s.get('processed_bytes')),
+            '_elapsed_str': FormatProgressInfos.format_seconds(s.get('elapsed')),
+        })
+
+        msg_template = with_fields(
+            ('total_bytes', '%(_percent_str)s of %(_total_bytes_str)s at %(_speed_str)s ETA %(_eta_str)s'),
+            ('processed_bytes', 'elapsed', '%(_processed_bytes_str)s at %(_speed_str)s (%(_elapsed_str)s)'),
+            ('processed_bytes', '%(_processed_bytes_str)s at %(_speed_str)s'),
+            default='%(_percent_str)s at %(_speed_str)s ETA %(_eta_str)s')
+
+        self._report_progress_status(s, msg_template)
+
     def _retry_download(self, err, count, retries):
         # While this is not an extractor, it behaves similar to one and
         # so obey extractor_retries and "--retry-sleep extractor"

yt_dlp/postprocessor/ffmpeg.py

@@ -5,7 +5,10 @@
 import os
 import re
 import subprocess
+import sys
 import time
+from queue import Queue
+from threading import Thread
 
 from .common import PostProcessor
 from ..compat import functools, imghdr
@@ -23,6 +26,7 @@
     encodeFilename,
     filter_dict,
     float_or_none,
+    int_or_none,
     is_outdated_version,
     orderedSet,
     prepend_extension,
@@ -326,11 +330,9 @@ def _duration_mismatch(self, d1, d2, tolerance=2):
         return abs(d1 - d2) > tolerance
 
     def run_ffmpeg_multiple_files(self, input_paths, out_path, opts, **kwargs):
-        return self.real_run_ffmpeg(
+        return self.real_run_ffmpeg([(path, []) for path in input_paths], [(out_path, opts)], **kwargs)
-            [(path, []) for path in input_paths],
-            [(out_path, opts)], **kwargs)
 
-    def real_run_ffmpeg(self, input_path_opts, output_path_opts, *, expected_retcodes=(0,)):
+    def real_run_ffmpeg(self, input_path_opts, output_path_opts, *, expected_retcodes=(0,), info_dict=None):
         self.check_version()
 
         oldest_mtime = min(
@@ -350,19 +352,20 @@ def make_args(file, args, name, number):
             args += self._configuration_args(self.basename, keys)
             if name == 'i':
                 args.append('-i')
-            return (
+            return [encodeArgument(arg) for arg in args] + [encodeFilename(self._ffmpeg_filename_argument(file), True)]
-                [encodeArgument(arg) for arg in args]
-                + [encodeFilename(self._ffmpeg_filename_argument(file), True)])
 
         for arg_type, path_opts in (('i', input_path_opts), ('o', output_path_opts)):
             cmd += itertools.chain.from_iterable(
                 make_args(path, list(opts), arg_type, i + 1)
                 for i, (path, opts) in enumerate(path_opts) if path)
 
+        cmd += ['-progress', 'pipe:1']
         self.write_debug('ffmpeg command line: %s' % shell_quote(cmd))
-        _, stderr, returncode = Popen.run(
+
-            cmd, text=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
+        ffmpeg_progress_tracker = FFmpegProgressTracker(info_dict, cmd, self._ffmpeg_hook, self._downloader)
-        if returncode not in variadic(expected_retcodes):
+        _, stderr, return_code = ffmpeg_progress_tracker.run_ffmpeg_subprocess()
+        if return_code not in variadic(expected_retcodes):
+            stderr = stderr.strip()
             self.write_debug(stderr)
             raise FFmpegPostProcessorError(stderr.strip().splitlines()[-1])
         for out_path, _ in output_path_opts:
@@ -370,7 +373,7 @@ def make_args(file, args, name, number):
                 self.try_utime(out_path, oldest_mtime, oldest_mtime)
         return stderr
 
-    def run_ffmpeg(self, path, out_path, opts, **kwargs):
+    def run_ffmpeg(self, path, out_path, opts, informations=None, **kwargs):
         return self.run_ffmpeg_multiple_files([path], out_path, opts, **kwargs)
 
     @staticmethod
@@ -435,6 +438,12 @@ def _concat_spec(cls, in_files, concat_opts=None):
                 if directive in opts:
                     yield f'{directive} {opts[directive]}\n'
 
+    def _ffmpeg_hook(self, status, info_dict):
+        status['processed_bytes'] = status.get('outputted', 0)
+        if status.get('status') == 'ffmpeg_running':
+            status['status'] = 'processing'
+        self._hook_progress(status, info_dict)
+
 
 class FFmpegExtractAudioPP(FFmpegPostProcessor):
     COMMON_AUDIO_EXTS = MEDIA_EXTENSIONS.common_audio + ('wma', )
@@ -469,14 +478,14 @@ def _quality_args(self, codec):
             return ['-vbr', f'{int(q)}']
         return ['-q:a', f'{q}']
 
-    def run_ffmpeg(self, path, out_path, codec, more_opts):
+    def run_ffmpeg(self, path, out_path, codec, more_opts, informations=None):
         if codec is None:
             acodec_opts = []
         else:
             acodec_opts = ['-acodec', codec]
         opts = ['-vn'] + acodec_opts + more_opts
         try:
-            FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts)
+            FFmpegPostProcessor.run_ffmpeg(self, path, out_path, opts, informations)
         except FFmpegPostProcessorError as err:
             raise PostProcessingError(f'audio conversion failed: {err.msg}')
 
@@ -527,7 +536,7 @@ def run(self, information):
             return [], information
 
         self.to_screen(f'Destination: {new_path}')
-        self.run_ffmpeg(path, temp_path, acodec, more_opts)
+        self.run_ffmpeg(path, temp_path, acodec, more_opts, information)
 
         os.replace(path, orig_path)
         os.replace(temp_path, new_path)
@@ -570,7 +579,7 @@ def run(self, info):
 
         outpath = replace_extension(filename, target_ext, source_ext)
         self.to_screen(f'{self._ACTION.title()} video from {source_ext} to {target_ext}; Destination: {outpath}')
-        self.run_ffmpeg(filename, outpath, self._options(target_ext))
+        self.run_ffmpeg(filename, outpath, self._options(target_ext), info)
 
         info['filepath'] = outpath
         info['format'] = info['ext'] = target_ext
@@ -834,7 +843,7 @@ def run(self, info):
             if fmt.get('vcodec') != 'none':
                 args.extend(['-map', '%u:v:0' % (i)])
         self.to_screen('Merging formats into "%s"' % filename)
-        self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args)
+        self.run_ffmpeg_multiple_files(info['__files_to_merge'], temp_filename, args, info_dict=info)
         os.rename(encodeFilename(temp_filename), encodeFilename(filename))
         return info['__files_to_merge'], info
 
@@ -1005,7 +1014,7 @@ def run(self, info):
                 else:
                     sub_filenames.append(srt_file)
 
-            self.run_ffmpeg(old_file, new_file, ['-f', new_format])
+            self.run_ffmpeg(old_file, new_file, ['-f', new_format], info)
 
             with open(new_file, encoding='utf-8') as f:
                 subs[lang] = {
@@ -1188,3 +1197,237 @@ def run(self, info):
             'ext': ie_copy['ext'],
         }]
         return files_to_delete, info
+
+
+class FFmpegProgressTracker:
+    def __init__(self, info_dict, ffmpeg_args, hook_progress, ydl=None):
+        self.ydl = ydl
+        self._info_dict = info_dict
+        self._ffmpeg_args = ffmpeg_args
+        self._hook_progress = hook_progress
+        self._stdout_queue, self._stderr_queue = Queue(), Queue()
+        self._streams, self._stderr_buffer, self._stdout_buffer = ['', ''], '', ''
+        self._progress_pattern = re.compile(r'''(?x)
+            (?:
+                frame=\s(?P<frame>\S+)\n
+                fps=\s(?P<fps>\S+)\n
+                stream\d+_\d+_q=\s(?P<stream_d_d_q>\S+)\n
+            )?
+            bitrate=\s(?P<bitrate>\S+)\n
+            total_size=\s(?P<total_size>\S+)\n
+            out_time_us=\s(?P<out_time_us>\S+)\n
+            out_time_ms=\s(?P<out_time_ms>\S+)\n
+            out_time=\s(?P<out_time>\S+)\n
+            dup_frames=\s(?P<dup_frames>\S+)\n
+            drop_frames=\s(?P<drop_frames>\S+)\n
+            speed=\s(?P<speed>\S+)\n
+            progress=\s(?P<progress>\S+)
+        ''')
+
+        if self.ydl:
+            self.ydl.write_debug(f'ffmpeg command line: {shell_quote(self._ffmpeg_args)}')
+        self.ffmpeg_proc = Popen(self._ffmpeg_args, universal_newlines=True,
+                                 encoding='utf8', stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        self._start_time = time.time()
+
+    def trigger_progress_hook(self, dct):
+        self._status.update(dct)
+        self._hook_progress(self._status, self._info_dict)
+
+    def run_ffmpeg_subprocess(self):
+        if self._info_dict and self.ydl:
+            return self._track_ffmpeg_progress()
+        return self._run_ffmpeg_without_progress_tracking()
+
+    def _run_ffmpeg_without_progress_tracking(self):
+        """Simply run ffmpeg and only care about the last stderr, stdout and the retcode"""
+        stdout, stderr = self.ffmpeg_proc.communicate_or_kill()
+        retcode = self.ffmpeg_proc.returncode
+        return stdout, stderr, retcode
+
+    def _track_ffmpeg_progress(self):
+        """ Track ffmpeg progress in a non blocking way using queues"""
+        self._start_time = time.time()
+        # args needed to track ffmpeg progress from stdout
+        self._duration_to_track, self._total_duration = self._compute_duration_to_track()
+        self._total_filesize = self._compute_total_filesize(self._duration_to_track, self._total_duration)
+        self._status = {
+            'filename': self._ffmpeg_args[-3].split(":")[-1],
+            'status': 'ffmpeg_running',
+            'total_bytes': self._total_filesize,
+            'elapsed': 0,
+            'outputted': 0
+        }
+
+        out_listener = Thread(
+            target=self._enqueue_lines,
+            args=(self.ffmpeg_proc.stdout, self._stdout_queue),
+            daemon=True,
+        )
+        err_listener = Thread(
+            target=self._enqueue_lines,
+            args=(self.ffmpeg_proc.stderr, self._stderr_queue),
+            daemon=True,
+        )
+        out_listener.start()
+        err_listener.start()
+
+        retcode = self._wait_for_ffmpeg()
+
+        self._status.update({
+            'status': 'finished',
+            'outputted': self._total_filesize
+        })
+        time.sleep(.5)  # Needed if ffmpeg didn't release the file in time for yt-dlp to change its name
+        return self._streams[0], self._streams[1], retcode
+
+    @staticmethod
+    def _enqueue_lines(out, queue):
+        for line in iter(out.readline, ''):
+            queue.put(line.rstrip())
+        out.close()
+
+    def _save_stream(self, lines, to_stderr=False):
+        if not lines:
+            return
+        self._streams[to_stderr] += lines
+
+        self.ydl.to_screen('\r', skip_eol=True)
+        for msg in lines.splitlines():
+            if msg.strip():
+                self.ydl.write_debug(f'ffmpeg: {msg}')
+
+    def _handle_lines(self):
+        if not self._stdout_queue.empty():
+            stdout_line = self._stdout_queue.get_nowait()
+            self._stdout_buffer += stdout_line + '\n'
+            self._parse_ffmpeg_output()
+
+        if not self._stderr_queue.empty():
+            stderr_line = self._stderr_queue.get_nowait()
+            self._stderr_buffer += stderr_line
+
+    def _wait_for_ffmpeg(self):
+        retcode = self.ffmpeg_proc.poll()
+        while retcode is None:
+            time.sleep(.01)
+            self._handle_lines()
+            self._status.update({
+                'elapsed': time.time() - self._start_time
+            })
+            self._hook_progress(self._status, self._info_dict)
+            retcode = self.ffmpeg_proc.poll()
+        return retcode
+
+    def _parse_ffmpeg_output(self):
+        ffmpeg_prog_infos = re.match(self._progress_pattern, self._stdout_buffer)
+        if not ffmpeg_prog_infos:
+            return
+        eta_seconds = self._compute_eta(ffmpeg_prog_infos, self._duration_to_track)
+        bitrate_int = self._compute_bitrate(ffmpeg_prog_infos.group('bitrate'))
+        # Not using ffmpeg 'total_size' value as it's imprecise and gives progress percentage over 100
+        out_time_second = int_or_none(ffmpeg_prog_infos.group('out_time_us')) // 1_000_000
+        try:
+            outputted_bytes_int = int_or_none(out_time_second / self._duration_to_track * self._total_filesize)
+        except ZeroDivisionError:
+            outputted_bytes_int = 0
+        self._status.update({
+            'outputted': outputted_bytes_int,
+            'speed': bitrate_int,
+            'eta': eta_seconds,
+        })
+        self._hook_progress(self._status, self._info_dict)
+        self._stderr_buffer = re.sub(r'=\s+', '=', self._stderr_buffer)
+        print(self._stdout_buffer, file=sys.stdout, end='')
+        print(self._stderr_buffer, file=sys.stderr)
+        self._stdout_buffer = ''
+        self._stderr_buffer = ''
+
+    def _compute_total_filesize(self, duration_to_track, total_duration):
+        if not total_duration:
+            return 0
+        filesize = self._info_dict.get('filesize')
+        if not filesize:
+            filesize = self._info_dict.get('filesize_approx', 0)
+        total_filesize = filesize * duration_to_track // total_duration
+        return total_filesize
+
+    def _compute_duration_to_track(self):
+        duration = self._info_dict.get('duration')
+        if not duration:
+            return 0, 0
+
+        start_time, end_time = 0, duration
+        for i, arg in enumerate(self._ffmpeg_args[:-1]):
+            next_arg_is_a_timestamp = re.match(r'(?P<at>(-ss|-sseof|-to))', arg)
+            this_arg_is_a_timestamp = re.match(r'(?P<at>(-ss|-sseof|-to))=(?P<timestamp>\d+)', arg)
+            if not (next_arg_is_a_timestamp or this_arg_is_a_timestamp):
+                continue
+            elif next_arg_is_a_timestamp:
+                timestamp_seconds = self.ffmpeg_time_string_to_seconds(self._ffmpeg_args[i + 1])
+            else:
+                timestamp_seconds = self.ffmpeg_time_string_to_seconds(this_arg_is_a_timestamp.group('timestamp'))
+            if next_arg_is_a_timestamp.group('at') == '-ss':
+                start_time = timestamp_seconds
+            elif next_arg_is_a_timestamp.group('at') == '-sseof':
+                start_time = end_time - timestamp_seconds
+            elif next_arg_is_a_timestamp.group('at') == '-to':
+                end_time = timestamp_seconds
+
+        duration_to_track = end_time - start_time
+        if duration_to_track >= 0:
+            return duration_to_track, duration
+        return 0, duration
+
+    @staticmethod
+    def _compute_eta(ffmpeg_prog_infos, duration_to_track):
+        try:
+            speed = float_or_none(ffmpeg_prog_infos.group('speed')[:-1])
+            out_time_second = int_or_none(ffmpeg_prog_infos.group('out_time_us')) // 1_000_000
+            eta_seconds = (duration_to_track - out_time_second) // speed
+        except (TypeError, ZeroDivisionError):
+            eta_seconds = 0
+        return eta_seconds
+
+    @staticmethod
+    def ffmpeg_time_string_to_seconds(time_string):
+        ffmpeg_time_seconds = 0
+        hms_parsed = re.match(r"((?P<Hour>\d+):)?((?P<Minute>\d+):)?(?P<Second>\d+)(\.(?P<float>\d+))?", time_string)
+        smu_parse = re.match(r"(?P<Time>\d+)(?P<Unit>[mu]?s)", time_string)
+        if hms_parsed:
+            if hms_parsed.group('Hour'):
+                ffmpeg_time_seconds += 3600 * int_or_none(hms_parsed.group('Hour'))
+            if hms_parsed.group('Minute'):
+                ffmpeg_time_seconds += 60 * int_or_none(hms_parsed.group('Minute'))
+            ffmpeg_time_seconds += int_or_none(hms_parsed.group('Second'))
+            if hms_parsed.group('float'):
+                float_part = hms_parsed.group('float')
+                ffmpeg_time_seconds += int_or_none(float_part) / (10 ** len(float_part))
+        elif smu_parse:
+            ffmpeg_time_seconds = int_or_none(smu_parse.group('Time'))
+            prefix_and_unit = smu_parse.group('Unit')
+            if prefix_and_unit == 'ms':
+                ffmpeg_time_seconds /= 1_000
+            elif prefix_and_unit == 'us':
+                ffmpeg_time_seconds /= 1_000_000
+        return ffmpeg_time_seconds
+
+    @staticmethod
+    def _compute_bitrate(bitrate):
+        bitrate_str = re.match(r"(?P<Integer>\d+)(\.(?P<float>\d+))?(?P<Prefix>[gmk])?bits/s", bitrate)
+        try:
+            no_prefix_bitrate = int_or_none(bitrate_str.group('Integer'))
+            if bitrate_str.group('float'):
+                float_part = bitrate_str.group('float')
+                no_prefix_bitrate += int_or_none(float_part) / (10 ** len(float_part))
+            if bitrate_str.group('Prefix'):
+                unit_prefix = bitrate_str.group('Prefix')
+                if unit_prefix == 'g':
+                    no_prefix_bitrate *= 1_000_000_000
+                elif unit_prefix == 'm':
+                    no_prefix_bitrate *= 1_000_000
+                elif unit_prefix == 'k':
+                    no_prefix_bitrate *= 1_000
+        except (TypeError, AttributeError):
+            return 0
+        return no_prefix_bitrate

yt_dlp/utils/_utils.py

@@ -5500,3 +5500,51 @@ def stdout(self, message):
     def stderr(self, message):
         if self._ydl:
             self._ydl.to_stderr(message)
+
+
+class FormatProgressInfos:
+    @staticmethod
+    def format_seconds(seconds):
+        if seconds is None:
+            return ' Unknown'
+        time = timetuple_from_msec(seconds * 1000)
+        if time.hours > 99:
+            return '--:--:--'
+        if not time.hours:
+            return '%02d:%02d' % time[1:-1]
+        return '%02d:%02d:%02d' % time[:-1]
+
+    format_eta = format_seconds
+
+    @staticmethod
+    def calc_percent(byte_counter, data_len):
+        if data_len is None:
+            return None
+        return float(byte_counter) / float(data_len) * 100.0
+
+    @staticmethod
+    def format_percent(percent):
+        return '  N/A%' if percent is None else f'{percent:>5.1f}%'
+
+    @staticmethod
+    def calc_eta(start, now, total, current):
+        if total is None:
+            return None
+        if now is None:
+            now = time.time()
+        dif = now - start
+        if current == 0 or dif < 0.001:  # One millisecond
+            return None
+        rate = float(current) / dif
+        return int((float(total) - float(current)) / rate)
+
+    @staticmethod
+    def calc_speed(start, now, bytes):
+        dif = now - start
+        if bytes == 0 or dif < 0.001:  # One millisecond
+            return None
+        return float(bytes) / dif
+
+    @staticmethod
+    def format_speed(speed):
+        return ' Unknown B/s' if speed is None else f'{format_bytes(speed):>10s}/s'