[FFmpeg-soc] libavfilter: memory leaks in ffmpeg

[Víctor Paesa]

Hi,

I have noticed that the ffmpeg patched to support --enable-avfilter
has memory leaks.
The test scenario is quite simple:

ffmpeg -i input.avi -s 1024x768 output.avi

The unpatched ffmpeg takes a fixed amount of about 13MB of RAM during all
the transcoding, but the memory usage in the patched one grows linearly
as it transcodes, up to a few hundreds of MB.

Large HxW sizes make the leakage more severe.

Regards,
Víctor