avfilter/avcodec: use NULL instead of 0 for pointer

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/hevc_ps: Add context to av_log() call

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/buffersrc: add context to av_log() call

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avfilter/vf_signalstats: fix avframe leak on error

Fixes CID1257014
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avformat/apetag: More completely check avio_get_str() return value

This is not needed but its more proper to check the return value

Fixes CID1041122

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/libxavs: disable global header code

This code only segfaults and fixing the segfault, the resulting
files are unplayable, so disable to avoid the segfault.

Better solution is welcome

See: [FFmpeg-devel] [PATCH] avcodec/libxavs: remove global header code
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>