[x264-devel] Issues with intra refresh?

Robert Logue robert.logue at openwave.com
Thu Jan 12 17:37:11 CET 2012


Hello,

When I was running a test harness to go to youtube and download random 
videos and transcode I found an issue. The issue is with intra-refresh 
turned on libx264 gives back different video for the same input video 
and params. This only seems to occur when the 1 process does multiple 
transcodes of the same file.

To test this I altered the x264.c file to transcode the same input file 
twice and as output I got two different video files different file size 
and different frame data.

The command I used was

/spare/x264/install/bin/x264 --preset=veryfast --bitrate=300 
--tune=zerolatency --profile=baseline --intra-refresh --vbv-maxrate=300 
--vbv-bufsize=12000 --ipratio=0.4 --qpmin=10  -o ./output.mp4 ./input.mp4

and the video can be found here

http://199.91.152.89/nhnunbt586kg/5xzsdnshfcgj459/tram.mp4

Note the video was downloaded by a random test harness and is quiet 
offensive. If possible it should not be watched and if watched the sound 
should be turned down.

I was on the web chat earlier and the guys on there indicated that this 
could be a bug. Is there any where else to raise this or is here ok?

Thanks

Robert


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