[x264-devel] Issues with intra refresh?

[Toby]

Question is similar to the deterministic discussion here:
http://forums.hexus.net/pc-hardware/118246-x264-video-encoding-benchmark-4.html

For ref, veryfast USED to mean:
subme 1, ref 1, me dia, partitions i8x8,i4x4, trellis 0, weightp 0,
no-mixed-refs, no-mbtree

This appears to be a single threaded encode, correct?

What version of libx264? Are you re-initializing every variable that
remains across your two encodes?

On Thu, Jan 12, 2012 at 11:51 AM, Robert Logue
<robert.logue at openwave.com> 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
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>> x264-devel at videolan.org
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>
>
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