Re: [FFmpeg-devel] FATE Errors

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

James Almer:
> 
> 
> On 4/30/2022 4:06 PM, Andreas Rheinhardt wrote:
>> Soft Works:
>>> Hi,
>>>
>>> is it a known issue that the current head of the master branch has
>>> FATE errors?
>>>
>>> I get the same locally as well as on the automated GitHub build.
>>> One is this:
>>>
>>> --- ./tests/ref/vsynth/vsynth2-mpeg2-422 2022-04-30
>>> 14:23:44.330424058 +0000
>>> +++ tests/data/fate/vsynth2-mpeg2-422 2022-04-30 14:38:41.071678201
>>> +0000
>>> @@ -1,4 +1,4 @@
>>> -b2fa9b73c3547191ecc01b8163abd4e5
>>> *tests/data/fate/vsynth2-mpeg2-422.mpeg2video
>>> -379164 tests/data/fate/vsynth2-mpeg2-422.mpeg2video
>>> -704f6a96f93c2409219bd48b74169041
>>> *tests/data/fate/vsynth2-mpeg2-422.out.rawvideo
>>> -stddev: 4.17 PSNR: 35.73 MAXDIFF: 70 bytes: 7603200/ 7603200
>>> +8f6d565723ccf879ab2b5aa910b7ce21
>>> *tests/data/fate/vsynth2-mpeg2-422.mpeg2video
>>> +380544 tests/data/fate/vsynth2-mpeg2-422.mpeg2video
>>> +0797fddea4835687dedddebbbe98fa8f
>>> *tests/data/fate/vsynth2-mpeg2-422.out.rawvideo
>>> +stddev: 4.16 PSNR: 35.73 MAXDIFF: 75 bytes: 7603200/ 7603200
>>> Test vsynth2-mpeg2-422 failed. Look at
>>> tests/data/fate/vsynth2-mpeg2-422.err for details.
>>> make: *** [tests/Makefile:277: fate-vsynth2-mpeg2-422] Error 1
>>>
>>>
>>> Is anybody seeing the same?
>>>
>>> Thanks,
>>> sw
>>
>> http://fate.ffmpeg.org/ doesn't show recent regressions and FATE is fine
>> for me locally. I recently made changes to FATE (namely the test
>> requirements, vcodec.mak (where the vsynth-tests reside) among the files
>> affected), so I am interested in whether the failing tests are
>> concentrated on the files recently changed by me (it would obviously not
>> haved pushed them if I knew them to cause issues; also patchwork was
>> fine).
>> Are these issues reproducible? Can you bisect them?
>>
>> - Andreas
> 
> This may be the alignment issue introduced in lavfi in
> https://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=17a59a634c39b00a680c6ebbaea58db95594d13d
> assuming it was not fixed.
> I think it only affected targets where av_cpu_max_align() returned 64.

You are completely right: Just making av_cpu_max_align return 64 allows
to reproduce the issue. And it has nothing to do with my recent FATE
patches (545e87f49dc9fa5b880e330fc4e1854df68cc0f1 would be the only
contender for changes).

- Andreas
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