No audio on Apple TV: surround track should be disabled if 2.0 track present about sickbeard_mp4_automator

[mdhiggins]

Any idea if this can be set in FFMPEG? I explored this option early in development but was unable to find if these settings can be specified in FFMPEG. If you look at the code there are actually options in place to check for a properly set default and forced values for the tracks but FFMPEG doesn't do anything with them.

[jrderuiter]

No idea, haven't been able to find it yet. Note that files produced on a Mac with ffmpeg 1.2.4 seem to have the correct behavior as the resulting files do have the second track disabled. This is supported by the following ffmpeg tickect: https://trac.ffmpeg.org/ticket/2626. Note that no manual option is mentioned here as far as I can see.

On a PC using ffmpeg binaries built on Nov 10 2013 (from http://ffmpeg.zeranoe.com/builds/) does however not disable the audio correctly and therefore does run into this issue. Strange.

[jrderuiter]

Confirmed on an identical file that the mac ffmpeg (installed through homebrew) does the right thing by default, however the windows build I am using does not.

Muxing using mp4box would allow you to set a audio track as disabled, as this is a sample flag when passing in the audio stream. I do not know how to specify this in ffmpeg though.

Update: Seems that a compiled version of ffmpeg 1.2.4 does perform correctly, in contrast to the current version of the zeranoe builds. A version of ffmpeg 1.2 is available at: http://ffmpeg.zeranoe.com/builds/win32/static/

[mdhiggins]

So updating to the latest 1.2.4 version of ffmpeg resolves the issue? It would be nice to find a way to set the forced flag for things like subtitles but that's a different issue.

[jrderuiter]

For me it was downgrading, as the current version (post 2.1, built on 12-Nov-2013) exhibits the wrong behavior. See the list of available ffmpeg windows builds at: http://ffmpeg.zeranoe.com/builds/win32/static/. I currently tried the 1.2 build, which seems to perform fine. I couldn't find a 1.2.4 build I trusted and was unable to build it myself unfortunately :(

[mdhiggins]

Thanks for clarifying. Since this is more of an ffmpeg issue than with my script I'll close this for now.