Bug#881536: ffmpeg: Breaks sound in kodi

[James Cowgill]

Hi,

On 12/11/17 20:32, Robert Luberda wrote:
> Package: ffmpeg
> Version: 7:3.4-2
> Severity: important
> 
> The latest ffmpeg makes sound in kodi to be scratchy, i.e. containing some 
> additional noise that makes watching videos in kodi uncomfortable/annoying.
> 
> Downgrading ffmpeg and dependent libraries to version 3.3.4-2+b3 fixes the
> issue (makes sound in kodi clear).

This is likely to be related to #879673 / #881286 which has a workaround
which I hoped would work, but doesn't seem to in every case. I can
reproduce the bug, but only for videos containing aac audio and only in
kodi.

I have attached a LD_PRELOAD shim which will cause any drain packets
sent to avcodec_decode_audio4 to be dropped (see the above bugs and
links for why this may be relevant). Could you compile it and run kodi
like this:

 gcc -shared shim.c -olibshim.so
 LD_PRELOAD=$(pwd)/libshim.so kodi-standalone

If that fixes your audio problems, then this is almost certainly #881286
in kodi (where kodi flagrantly violates the ffmpeg API).

Thanks,
James
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