Quality degrades after keyframes in h264 decoding

Hi All,

Sorry if this message reaches you twice. I am trying to have a sensible
subject this time so that it is not moderated to /dev/null.

I have ported and compiled ffmpeg with RealView 3.0 (using --gnu) tools and
running it on OMAP1710. I am having problem with H.264 decoding. After
keyframe the coming frames start to degrade in quality and error
continuously increases in coming frames until next keyframe is reached. Can
anyone point out the areas where i can look to solve this problem. I am
using the code provided by Martin Böhme
(http://www.inb.uni-luebeck.de/~boehme/libavcodec_update.html)<http://www.inb.uni-luebeck.de/staff/boehme-d.html>Do
I need to do some pre/post processing of frames for correct decoding?
I
am just reading frames, decoding and printing them.

Best Regards,
Touseef

Re: Low quality encoding...

Dan MacDonald wrote:
> Hi!
> 
> I'm just wondering, now that the PS3 has been released in Europe too,
> if anybody has started optimising ffmpeg for the Cell?
> 
> Is gcc's current Cell support any good? I've heard their is a non-free
> IBM Cell compiler which is much better. Would ffmpeg libs compiled
> with IBMs compiler still be freely distributable?
> 
Please dont hijack threads. At best it reduces your chances to receive a 
reply. At worst it might get you killfiled.

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Keyframe?

Is there a way to know if a frame is a key-frame without decoding it first?

Re: Keyframe?

Wildex999 wrote:
> Is there a way to know if a frame is a key-frame without decoding it 
> first?
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user <at> mplayerhq.hu
> http://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-user
>
No matter annymore =) I found it out =D

I just had to do a
if(packet.flags & 0x0001)
after reading a frame =)

ffplay is not able to play amr sound

  Hi All, 
   I extracted the source code for amr nb in ffmpeg/libavcodec/amr directory ( as suggested in ffmpeg
documentation) and configured it using --enable-amr-nb-fixed and  build/installed it. when I tried to
play amr file using ffplay, it does not play sound. It does not report any codec error.
can anyone give me some clue on how to play amr file?

Thanks & Regards,
Sanjay

ffplay is not able to play amr sound

  Hi All, 
   I extracted the source code for amr nb in ffmpeg/libavcodec/amr directory ( as suggested in ffmpeg
documentation) and configured it using --enable-amr-nb-fixed and  build/installed it. when I tried to
play amr file using ffplay, it does not play sound. It does not report any codec error.
can anyone give me some clue on how to play amr file?

Thanks & Regards,
Sanjay

Re: ffplay is not able to play amr sound

On 2 Apr 2007 11:39:43 -0000, "sanjay kumar gupta"
<sanjay417 <at> rediffmail.com> wrote:

>    I extracted the source code for amr nb in ffmpeg/libavcodec/amr
> directory ( as suggested in ffmpeg documentation) and configured it
> using --enable-amr-nb-fixed and  build/installed it. when I tried to
> play amr file using ffplay, it does not play sound. It does not
> report any codec error. can anyone give me some clue on how to play
> amr file?

What does 'ffmpeg -formats | grep amr' output?

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QT Reference MOV

Hello:

Can anyone help me out with anyway to play/encode from a QT reference
movie via FFMPEG, MPlayer/Mencoder or VLC?

I am trying to encode from QT reference files created by an AVID.  I can
play the files in Quicktime (running on linux via wine) but need to
encode them via x264.

Would greatly appreciate any help.

Cheers,

David

Re: ffplay is not able to play amr sound

sanjay kumar gupta wrote:
> Hi All, I extracted the source code for amr nb in
> ffmpeg/libavcodec/amr directory ( as suggested in ffmpeg
> documentation) and configured it using --enable-amr-nb-fixed and
> build/installed it. when I tried to play amr file using ffplay, it
> does not play sound. It does not report any codec error. can anyone
> give me some clue on how to play amr file?
> 
Please post output of ffmpeg -i <yourfile.amr>

Did you 'make distclean' before configure?

--

-- 
Michel Bardiaux
R&D Director
T +32 [0] 2 790 29 41
F +32 [0] 2 790 29 02
E mailto:mbardiaux <at> mediaxim.be

Mediaxim NV/SA
Vorstlaan 191 Boulevard du Souverain
Brussel 1160 Bruxelles
http://www.mediaxim.com/

Re: QT Reference MOV

Hi

David Thompson wrote:
> Hello:
> 
> Can anyone help me out with anyway to play/encode from a QT reference
> movie via FFMPEG, MPlayer/Mencoder or VLC?
> 
> I am trying to encode from QT reference files created by an AVID.  I can
> play the files in Quicktime (running on linux via wine) but need to
> encode them via x264.
> 
> Would greatly appreciate any help.
> 

ffmpeg does not support reference mov, use self contained.

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