[FFmpeg-devel] [BROKEN] apad causes infinite hang

[Paul B Mahol]

Just try with:

ffmpeg -f lavfi -i sine=d=30 -af apad -f null -

Pressing 'q' will not stop it at all, because current ffmpeg code will try
to flush all frames, but because pad filter never receives EOF from next
filter in chain (sink) it will happily produce frame forever.

Tried to fix ffmpeg.c related code but quickly realized rewrite just made
it 10 times worse to debug this.

Most clean solution is adding av_buffersink_close()