[FFmpeg-user] New Overread VUI by 5 bits Warnings when decoding from AVC-Intra from Avid

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Jun 6 16:08:28 EEST 2018

2018-06-06 13:09 GMT+02:00, Christoph Gerstbauer
<christophgerstbauer at gmail.com>:
> Hello,
> in the year 2014 I reported a Problem when decoding H264 10bit from
> AVCIntra MXF files.
> MXF File was created by Premiere:
> The old thread:
> https://lists.ffmpeg.org/pipermail/ffmpeg-user/2014-May/021213.html
> The problem was that the commandline output showed multiple error warnings
> with this information: "Overread VUI by 5 bits".
> This problem was fixed in 2014. I think it was a demuxer problem.
> Now I have the "same" problem with a MXF file from another encoder: AVID.
> -> Again "Overread VUI by 5 bits"
> By testing with FFMPEG 3.4 we get this:
> # May__2014: Decoding AVCIntra MXF made by Premiere: STILL GOOD.
> No Warnings, no Errors

Several errors are shown here for your old sample, they appear
to affect decoding.

> # June_2018: Decoding AVCIntra MXF made by AVID: "Overread VUI by 5 bits"

These messages do not look related, they are initialization-only.
I opened ticket #7249.

> The file from May2014 can be downloaded here:

> Decoding still without problems.

As said above, I don't think this is true.

> https://www.dropbox.com/s/yqtdt1enqt18wjv/ffmpeg__2014_PremierePro--Overread.VUI.by.5.bits.Problem___FIXED.mxf.zip?dl=0
> The current problem example file (June2018) can be downloaded here:
> https://www.dropbox.com/s/we2fldkgyc9tjq3/ffmpeg__2018_Sample-from-AVIDSystem--Overread.VUI.by.5.bits.Problem___NEW.mxf.zip?dl=0

I opened ticket #7249

Carl Eugen

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