Merge 1cae3bf46d into 52c0ffe40a

I'm dumb

yt_dlp/postprocessor/ffmpeg.py

@@ -219,9 +219,20 @@ class FFmpegPostProcessor(PostProcessor):
     @staticmethod
     def stream_copy_opts(copy=True, *, ext=None):
         yield from ('-map', '0')
+
+        if ext in ('mkv', 'mka'):
+            # Some streams, such as JSON attachments, are considered of unknown
+            # type by FFmpeg but we still want to copy them.
+            yield '-copy_unknown'
+        else:
+            # Most containers don't really like unknown streams. Let's make
+            # sure to get rid of them.
+            yield '-ignore_unknown'
+
         # Don't copy Apple TV chapters track, bin_data
         # See https://github.com/yt-dlp/yt-dlp/issues/2, #19042, #19024, https://trac.ffmpeg.org/ticket/6016
-        yield from ('-dn', '-ignore_unknown')
+        yield '-dn'
+
         if copy:
             yield from ('-c', 'copy')
         if ext in ('mp4', 'mov', 'm4a'):
@@ -556,7 +567,7 @@ class FFmpegVideoConvertorPP(FFmpegPostProcessor):
 
     @staticmethod
     def _options(target_ext):
-        yield from FFmpegPostProcessor.stream_copy_opts(False)
+        yield from FFmpegPostProcessor.stream_copy_opts(False, ext=target_ext)
         if target_ext == 'avi':
             yield from ('-c:v', 'libxvid', '-vtag', 'XVID')
 
@@ -582,7 +593,7 @@ class FFmpegVideoRemuxerPP(FFmpegVideoConvertorPP):
 
     @staticmethod
     def _options(target_ext):
-        return FFmpegPostProcessor.stream_copy_opts()
+        return FFmpegPostProcessor.stream_copy_opts(ext=target_ext)
 
 
 class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
@@ -619,13 +630,18 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
         webm_vtt_warn = False
         mp4_ass_warn = False
 
+        json_subs = {}
+
         for lang, sub_info in subtitles.items():
             if not os.path.exists(sub_info.get('filepath', '')):
                 self.report_warning(f'Skipping embedding {lang} subtitle because the file is missing')
                 continue
             sub_ext = sub_info['ext']
             if sub_ext == 'json':
-                self.report_warning('JSON subtitles cannot be embedded')
+                if info['ext'] in ('mkv', 'mka'):
+                    json_subs[lang] = sub_info['filepath']
+                else:
+                    self.report_warning('JSON subtitles can only be embedded in mkv/mka files.')
             elif ext != 'webm' or ext == 'webm' and sub_ext == 'vtt':
                 sub_langs.append(lang)
                 sub_names.append(sub_info.get('name'))
@@ -638,31 +654,48 @@ class FFmpegEmbedSubtitlePP(FFmpegPostProcessor):
                 mp4_ass_warn = True
                 self.report_warning('ASS subtitles cannot be properly embedded in mp4 files; expect issues')
 
-        if not sub_langs:
+        if not sub_langs and not json_subs:
             return [], info
 
         input_files = [filename, *sub_filenames]
 
-        opts = [
-            *self.stream_copy_opts(ext=info['ext']),
-            # Don't copy the existing subtitles, we may be running the
-            # postprocessor a second time
-            '-map', '-0:s',
-        ]
+        opts = [*self.stream_copy_opts(ext=info['ext'])]
+
+        if sub_langs and sub_names:
+            # We have regular subtitles available to embed. Don't copy the
+            # existing subtitles, we may be running the postprocessor a second
+            # time.
+            opts.extend([
+                '-map', '-0:s',
+            ])
+
         for i, (lang, name) in enumerate(zip(sub_langs, sub_names)):
-            opts.extend(['-map', f'{i + 1}:0'])
             lang_code = ISO639Utils.short2long(lang) or lang
-            opts.extend([f'-metadata:s:s:{i}', f'language={lang_code}'])
+            opts.extend([
+                '-map', f'{i + 1}:0',
+                f'-metadata:s:s:{i}', f'language={lang_code}',
+            ])
+
             if name:
                 opts.extend([f'-metadata:s:s:{i}', f'handler_name={name}',
                              f'-metadata:s:s:{i}', f'title={name}'])
 
+        for json_lang, json_filename in json_subs.items():
+            escaped_json_filename = self._ffmpeg_filename_argument(json_filename)
+            json_basename = os.path.basename(json_filename)
+            opts.extend([
+                '-map', f'-0:m:filename:{json_lang}.json?',
+                '-attach', escaped_json_filename,
+                f'-metadata:s:m:filename:{json_basename}', 'mimetype=application/json',
+                f'-metadata:s:m:filename:{json_basename}', f'filename={json_lang}.json',
+            ])
+
         temp_filename = prepend_extension(filename, 'temp')
         self.to_screen(f'Embedding subtitles in "{filename}"')
         self.run_ffmpeg_multiple_files(input_files, temp_filename, opts)
         os.replace(temp_filename, filename)
 
-        files_to_delete = [] if self._already_have_subtitle else sub_filenames
+        files_to_delete = [] if self._already_have_subtitle else [*sub_filenames, *json_subs.values()]
         return files_to_delete, info
 
 
@@ -677,7 +710,7 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
     @staticmethod
     def _options(target_ext):
         audio_only = target_ext == 'm4a'
-        yield from FFmpegPostProcessor.stream_copy_opts(not audio_only)
+        yield from FFmpegPostProcessor.stream_copy_opts(not audio_only, ext=target_ext)
         if audio_only:
             yield from ('-vn', '-acodec', 'copy')
 
@@ -805,15 +838,20 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
             write_json_file(self._downloader.sanitize_info(info, self.get_param('clean_infojson', True)), infofn)
             info['infojson_filename'] = infofn
 
-        old_stream, new_stream = self.get_stream_number(info['filepath'], ('tags', 'mimetype'), 'application/json')
-        if old_stream is not None:
-            yield ('-map', f'-0:{old_stream}')
-            new_stream -= 1
+        escaped_name = self._ffmpeg_filename_argument(infofn)
+        info_basename = os.path.basename(infofn)
 
         yield (
-            '-attach', self._ffmpeg_filename_argument(infofn),
-            f'-metadata:s:{new_stream}', 'mimetype=application/json',
-            f'-metadata:s:{new_stream}', 'filename=info.json',
+            # In order to override any old info.json reliably we need to
+            # instruct FFmpeg to consider valid tracks without a codec id, like
+            # JSON attachments.
+            '-copy_unknown',
+            # This map operation allows us to actually replace any previous
+            # info.json data.
+            '-map', '-0:m:filename:info.json?',
+            '-attach', escaped_name,
+            f'-metadata:s:m:filename:{info_basename}', 'mimetype=application/json',
+            f'-metadata:s:m:filename:{info_basename}', 'filename=info.json',
         )
 
 
@@ -872,7 +910,7 @@ class FFmpegFixupStretchedPP(FFmpegFixupPostProcessor):
         stretched_ratio = info.get('stretched_ratio')
         if stretched_ratio not in (None, 1):
             self._fixup('Fixing aspect ratio', info['filepath'], [
-                *self.stream_copy_opts(), '-aspect', f'{stretched_ratio:f}'])
+                *self.stream_copy_opts(ext=info['ext']), '-aspect', f'{stretched_ratio:f}'])
         return [], info
 
 
@@ -880,7 +918,7 @@ class FFmpegFixupM4aPP(FFmpegFixupPostProcessor):
     @PostProcessor._restrict_to(images=False, video=False)
     def run(self, info):
         if info.get('container') == 'm4a_dash':
-            self._fixup('Correcting container', info['filepath'], [*self.stream_copy_opts(), '-f', 'mp4'])
+            self._fixup('Correcting container', info['filepath'], [*self.stream_copy_opts(ext=info['ext']), '-f', 'mp4'])
         return [], info
 
 
@@ -903,7 +941,7 @@ class FFmpegFixupM3u8PP(FFmpegFixupPostProcessor):
             if self.get_audio_codec(info['filepath']) == 'aac':
                 args.extend(['-bsf:a', 'aac_adtstoasc'])
             self._fixup('Fixing MPEG-TS in MP4 container', info['filepath'], [
-                *self.stream_copy_opts(), *args])
+                *self.stream_copy_opts(ext=info['ext']), *args])
         return [], info
 
 
@@ -924,7 +962,7 @@ class FFmpegFixupTimestampPP(FFmpegFixupPostProcessor):
             opts = ['-vf', 'setpts=PTS-STARTPTS']
         else:
             opts = ['-c', 'copy', '-bsf', 'setts=ts=TS-STARTPTS']
-        self._fixup('Fixing frame timestamp', info['filepath'], [*opts, *self.stream_copy_opts(False), '-ss', self.trim])
+        self._fixup('Fixing frame timestamp', info['filepath'], [*opts, *self.stream_copy_opts(False, ext=info['ext']), '-ss', self.trim])
         return [], info
 
 
@@ -933,7 +971,7 @@ class FFmpegCopyStreamPP(FFmpegFixupPostProcessor):
 
     @PostProcessor._restrict_to(images=False)
     def run(self, info):
-        self._fixup(self.MESSAGE, info['filepath'], self.stream_copy_opts())
+        self._fixup(self.MESSAGE, info['filepath'], self.stream_copy_opts(ext=info['ext']))
         return [], info
 
 
@@ -1062,7 +1100,7 @@ class FFmpegSplitChaptersPP(FFmpegPostProcessor):
         self.to_screen(f'Splitting video by chapters; {len(chapters)} chapters found')
         for idx, chapter in enumerate(chapters):
             destination, opts = self._ffmpeg_args_for_chapter(idx + 1, chapter, info)
-            self.real_run_ffmpeg([(in_file, opts)], [(destination, self.stream_copy_opts())])
+            self.real_run_ffmpeg([(in_file, opts)], [(destination, self.stream_copy_opts(ext=info['ext']))])
         if in_file != info['filepath']:
             self._delete_downloaded_files(in_file, msg=None)
         return [], info