[FFmpeg-user] MJPEG encoder large memory allocation issue

Tithi Patel tithi.patel at einfochips.com
Tue Sep 9 07:41:04 CEST 2014

I am using ARM processor (DM8168).
The total memory available is 256 MB.
Also, there are several other processes going on in the system like live streaming of 4 streams.

In this scenario system does not always have enough memory to support 138 MB allocation.
From: ffmpeg-user-bounces at ffmpeg.org <ffmpeg-user-bounces at ffmpeg.org> on behalf of Carl Eugen Hoyos <cehoyos at ag.or.at>
Sent: Friday, September 5, 2014 6:11 PM
To: ffmpeg-user at ffmpeg.org
Subject: Re: [FFmpeg-user] MJPEG encoder large memory allocation issue

Tithi Patel <tithi.patel <at> einfochips.com> writes:

> Output #0, image2, to 'out.jpg':
>   Metadata:
>     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?

Carl Eugen

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