Opened 11 years ago
Last modified 11 years ago
#2901 new enhancement
mpeg4 encoder does not have any of the profile/level standard
Reported by: | iuqbgq9h-1@yahoo.com | Owned by: | |
---|---|---|---|
Priority: | wish | Component: | avcodec |
Version: | git-master | Keywords: | asp |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Summary of the request:
When encoding mpeg4 video (-c:v mpeg4) with ffmpeg, it does not have any limits of the various profile/levels for mpeg4 as found in MPEG-4 Part 2 and listed on this page
http://en.wikipedia.org/wiki/MPEG-4
(see MPEG-4 Levels section)
So for instance, the max bitrate and max buffer size are not programmed, and the generated video can violate these limits. They have to be set manually (with -maxrate, -bufsize). Moreover, to get "Advanced Simple Profile", need to use '-profile 15', which is an odd number unfound in the documentation and has to be looked up in the source code.
How to reproduce:
% ffmpeg -i input -c:v mpeg4 ... output ffmpeg version N-55721-gc443689 built on Aug 22 2013 19:06:24 with gcc 4.7.3 (GCC)
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
Change History (2)
comment:1 by , 11 years ago
Keywords: | asp added; mpeg4 profile level removed |
---|---|
Priority: | minor → wish |
Just for reference for anyone getting here with google and needs to find the "odd numbers" refering to profile/level, it is defined in "ISO/IEC 14496-2", but gpac contains a nice list of the combinations;
https://svn.code.sf.net/p/gpac/code/trunk/gpac/src/media_tools/av_parsers.c
For example use
-profile:v 15 -level 7
in FFmpeg forAdvancedSimple@L3b
:(
0xF
is the hexadecimal value of 15)