[x264-devel] Issues with intra refresh?

[BugMaster]

On Thu, 12 Jan 2012 16:51:01 +0000, Robert Logue wrote:
> I forgot to add I am using libx264.so.120

> On 12/01/12 16:37, Robert Logue wrote:
>> 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

I can't reproduce your issue with one thread (add --threads 1 to your
command line) about which you were talking on IRC. As for
multithreading case the non-determinism is due use of VBV. So may be
you attach you changes to x264.c because it most probably you messed
up somewhere there or you used multithreading (even though you said
you didn't but I don't see --threads 1 in your commandline).