FFmpeg for mpeg4

*nix specific usage questions
Incarnate
New Cone
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Posts: 5
Joined: 03 Jun 2010 08:26

FFmpeg for mpeg4

Postby Incarnate » 07 Jun 2010 09:46

I'm having trouble with my mpeg4 encoding.

I use a standard pipeline for encoding with limited parameters :

vlc -vvv v4l2:///dev/video0:input=0:width=176:height=144:adev=hw.1,0:samplerate=32000 --sout=#'transcode{vcodec=mp4v,acodec=mp4a,venc=ffmpeg{keyint=40,vt=20},vb=800,ab=16}:rtp{mp4a-latm,dst=182.172.255.25,port-audio=45192,port-video=45194,sdp="file://n19.sdp"}'

The output however is really poor.

I'm running it on a :

VLC media player 1.0.6 Goldeneye
VLC version 1.0.6 Goldeneye
Compiled by mockbuild@builder.wilsonet.com
Compiler: gcc version 4.4.3 20100127 (Red Hat 4.4.3-4) (GCC)
This program comes with NO WARRANTY, to the extent permitted by law.
You may redistribute it under the terms of the GNU General Public Licence;
see the file named COPYING for details.


Is there any way that I can improve video quality?
I'm also looking to generate a particular output, which is defined in the sdp file as :

m=video 0 RTP/AVP 96
b=AS:175
b=RR:0
a=rtpmap:96 MP4V-ES/90000
a=fmtp:96 profile-level-id=3; config=000001b001000001b58913000001000000012000c4f8987d88007d0a041c9463000001b24c61766335322e32392e30;
a=framesize:96 320-228
a=control:trackID=2

So if anyone has any clue, or any advice on alternative encoders and how to use them, I'd be really grateful.

kwizart
Cone that earned his stripes
Cone that earned his stripes
Posts: 164
Joined: 18 Dec 2006 03:43

Re: FFmpeg for mpeg4

Postby kwizart » 16 Jun 2010 23:49

I guess this is a problem within FFmeg library. This would help to have a bug report here:
https:://bugzilla.rpmfusion.org

On the other side, are you able to reproduce this problem using vlc 1.1.0 using:
rpm -ivh http://rpms.kwizart.net/kwizart-release-13.rpm
yum update vlc\* --enablerepo=kwizart


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