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Published 20 hours ago • verified publisher icon sjwilliams

.webm encodes / test fails.

Open sjwilliams opened this issue 11 years ago • 4 comments

Generated .webm files in unit tests are returning different checksums on every run, making reliable test impossible.

This happens form the command line and when running the task. Is this a FFMPEG settings issue? I can't seem to find any info on it.

sjwilliams avatar Jan 19 '14 00:01 sjwilliams

For me, the .webm files are returning consistent checksums. However, they are different than expected test value.

FFMPEG 1.2.4 screen shot 2014-02-06 at 10 51 38 am

seanhellwig avatar Feb 06 '14 18:02 seanhellwig

@seanhellwig, thanks for looking into this.

I'm also on FFmpeg 1.2.4. I've set up a test to show that I can encode the same file and generate non-identical encodes. In the following screenshot, I'm encode the same file twice per run. The checksums change for each output, and across both runs.

1__bash-4

If you don't mind, would you run grunt in the issue6 branch here and see if you get the same result I do? https://github.com/sjwilliams/videotests/tree/issue6

sjwilliams avatar Feb 09 '14 15:02 sjwilliams

Same results.. Thats really weird. Do you think it has to do with some sort of Variable Bit Rate setting? screen shot 2014-02-09 at 10 14 13 am

seanhellwig avatar Feb 09 '14 18:02 seanhellwig

That's my assumption. I've struggled to find FFmpeg/webm docs that make it clear to me what's wrong.

sjwilliams avatar Feb 09 '14 18:02 sjwilliams