[FFmpeg-user] MJPEG encoder large memory allocation issue
Carl Eugen Hoyos
cehoyos at ag.or.at
Fri Sep 5 14:41:50 CEST 2014
Tithi Patel <tithi.patel <at> einfochips.com> writes:
> Output #0, image2, to 'out.jpg':
> encoder : Lavf54.29.104
> Stream #0:0: Video: mjpeg, yuvj422p, 4000x2992
This image has 250 x 187 macroblocks.
Currently (since nearly ten years), FFmpeg assumes a
theoretical maximum size for one macroblock of
3000 bytes (see libavcodec/mpegvideo.h line 75).
A small overhead for safety is added in
libavcodec/mpegvideo_enc.c line 1702.
Could you explain your usecase? I would assume that
on a modern system where you want to encode 4k a
100 MB allocation (that does not leak) is no
problem or am I wrong?
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