Added --remux-video option

Fixes #6996

- Supported formats declared: mp4, mkv
- Added FFmpegVideoRemuxerPP as postprocessor
- Added option to README and shell-completion scripts

4 files changed, 35 insertions, 0 deletions

diff --git a/youtube_dl/__init__.py b/youtube_dl/__init__.py
index 9a659fc65..838df9e56 100644
--- a/youtube_dl/__init__.py
+++ b/youtube_dl/__init__.py
@@ -209,6 +209,9 @@ def _real_main(argv=None):
         opts.audioquality = opts.audioquality.strip('k').strip('K')
         if not opts.audioquality.isdigit():
             parser.error('invalid audio quality specified')
+    if opts.remuxvideo is not None:
+        if opts.remuxvideo not in ['mp4', 'mkv']:
+            parser.error('invalid video container format specified')
     if opts.recodevideo is not None:
         if opts.recodevideo not in ['mp4', 'flv', 'webm', 'ogg', 'mkv', 'avi']:
             parser.error('invalid video recode format specified')
@@ -261,6 +264,11 @@ def _real_main(argv=None):
             'preferredquality': opts.audioquality,
             'nopostoverwrites': opts.nopostoverwrites,
         })
+    if opts.remuxvideo:
+        postprocessors.append({
+            'key': 'FFmpegVideoRemuxer',
+            'preferedformat': opts.remuxvideo,
+        })
     if opts.recodevideo:
         postprocessors.append({
             'key': 'FFmpegVideoConvertor',
diff --git a/youtube_dl/options.py b/youtube_dl/options.py
index 6d5ac62b3..3b4125f2f 100644
--- a/youtube_dl/options.py
+++ b/youtube_dl/options.py
@@ -791,6 +791,10 @@ def parseOpts(overrideArguments=None):
         dest='audioquality', default='5',
         help='Specify ffmpeg/avconv audio quality, insert a value between 0 (better) and 9 (worse) for VBR or a specific bitrate like 128K (default %default)')
     postproc.add_option(
+        '--remux-video',
+        metavar='FORMAT', dest='remuxvideo', default=None,
+        help='Remux the video to another container format if necessary (currently supported: mp4|mkv, target container format must support video / audio encoding, remuxing may fail)')
+    postproc.add_option(
         '--recode-video',
         metavar='FORMAT', dest='recodevideo', default=None,
         help='Encode the video to another format if necessary (currently supported: mp4|flv|ogg|webm|mkv|avi)')
diff --git a/youtube_dl/postprocessor/__init__.py b/youtube_dl/postprocessor/__init__.py
index 3ea518399..2c4702823 100644
--- a/youtube_dl/postprocessor/__init__.py
+++ b/youtube_dl/postprocessor/__init__.py
@@ -11,6 +11,7 @@ from .ffmpeg import (
     FFmpegMergerPP,
     FFmpegMetadataPP,
     FFmpegVideoConvertorPP,
+    FFmpegVideoRemuxerPP,
     FFmpegSubtitlesConvertorPP,
 )
 from .xattrpp import XAttrMetadataPP
@@ -35,6 +36,7 @@ __all__ = [
     'FFmpegPostProcessor',
     'FFmpegSubtitlesConvertorPP',
     'FFmpegVideoConvertorPP',
+    'FFmpegVideoRemuxerPP',
     'MetadataFromTitlePP',
     'XAttrMetadataPP',
 ]
diff --git a/youtube_dl/postprocessor/ffmpeg.py b/youtube_dl/postprocessor/ffmpeg.py
index fd3f921a8..ab9721305 100644
--- a/youtube_dl/postprocessor/ffmpeg.py
+++ b/youtube_dl/postprocessor/ffmpeg.py
@@ -349,6 +349,27 @@ class FFmpegExtractAudioPP(FFmpegPostProcessor):
         return [path], information
 
 
+class FFmpegVideoRemuxerPP(FFmpegPostProcessor):
+    def __init__(self, downloader=None, preferedformat=None):
+        super(FFmpegVideoRemuxerPP, self).__init__(downloader)
+        self._preferedformat = preferedformat
+
+    def run(self, information):
+        path = information['filepath']
+        if information['ext'] == self._preferedformat:
+            self._downloader.to_screen('[ffmpeg] Not remuxing video file %s - already is in target format %s' % (path, self._preferedformat))
+            return [], information
+        options = ['-c', 'copy']
+        prefix, sep, ext = path.rpartition('.')
+        outpath = prefix + sep + self._preferedformat
+        self._downloader.to_screen('[' + 'ffmpeg' + '] Remuxing video from %s to %s, Destination: ' % (information['ext'], self._preferedformat) + outpath)
+        self.run_ffmpeg(path, outpath, options)
+        information['filepath'] = outpath
+        information['format'] = self._preferedformat
+        information['ext'] = self._preferedformat
+        return [path], information
+
+
 class FFmpegVideoConvertorPP(FFmpegPostProcessor):
     def __init__(self, downloader=None, preferedformat=None):
         super(FFmpegVideoConvertorPP, self).__init__(downloader)