This reverts commit 7360db05b4.
This commit was added as an attempt to fix#6046. Unfortunately, the fix
is completely wrong. As reported on #10359, embedded thumbnails are not
displayed in VLC, and Se7en on IRC reports that the embedded thumbnail
misleads mpv as well.
The correct way is using -attachment of ffmpeg, while the current
run_ffmpeg_multiple_files API can't handle it cleanly.
This reverts commit ccff2c404d.
Fixes#10081.
The new approach breaks embedding subtitles into video-only or
audio-only files. FFMpeg provides a trick: add '?' after the argument of
'-map' so that a missing stream is ignored. For example:
opts = [
'-map', '0:v?',
'-c:v', 'copy',
'-map', '0:a?',
'-c:a', 'copy',
# other options...
]
Unfortunately, such a format is not implemented in avconv, either.
I guess adding '-ignore_unknown' if self.basename == 'ffmpeg' is the
best solution. However, the example mentioned in #9063 no longer serves
problematic files, so I can't test it. I'll reopen#9063 and wait for
another example so that I can test '-ignore_unknown'.
When no `downloader` is passed to `FFmpegPostProcessor`
an exception was raised trying to get the prefer ffmpeg param.
AttributeError: 'NoneType' object has no attribute 'params'
This fixes and defaults to `False`.