[x264-devel] h264 video in FLV container have artifacts by playingfrom a position to next keyframe

[Bruce Weir]

Can you attach the first 1000 or so bytes of your corrupted .flv file to a message and I will take a look?
As a wild guess, I would suggest that you are missing an I frame at the start of your file, in which case the subsequent predicted frames will be displaying incorrectly until the next I frame appears. ffplay will happily play such corrupted frames, but Flash Player probably will not. I will be able to tell for sure by taking a look at the file.
 
The following link describes the format of flash video
http://www.adobe.com/devnet/flv/pdf/video_file_format_spec_v10.pdf <http://www.adobe.com/devnet/flv/pdf/video_file_format_spec_v10.pdf> 
which should allow you to pick out the H264 video sections from your file and check if the first H264 frame is a keyframe or interframe.

________________________________

From: x264-devel-bounces at videolan.org on behalf of vf
Sent: Thu 09/07/2009 18:09
To: x264-devel at videolan.org
Subject: [x264-devel] h264 video in FLV container have artifacts by playingfrom a position to next keyframe


I'm putting h264 video to the FLV container:

# /usr/local/bin/mencoder -o /tmp/80056336515605765 /root/videotest/Crete_Faistas. 
avi -ovc x264 -x264encopts bitrate=288:frameref=5:bframes=0:me=umh:partitions=all:trellis=1:qp_step=4:qcomp=0.7:direct_pred=auto:keyint=30:threads=auto -vf scale=540:436,harddup -oac mp3lame -lavcopts acodec=mp3:abitrate=128 -srate 22050

It looks fine - no artifacts 

When I copy it in a FLV container:

# ffmpeg -i /tmp/80056336515605765 -f flv -acodec copy -vcodec copy -sameq /tmp/test.flv

This video have artifacts by playing from a position to next keyframe.

Can someone help me? Or point documentation?

P.S. I'm using VLC player and Flowplayer. The results are the same.

-- 
Best Regards,
Volodymyr Fedorchuk


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