[FFmpeg-user] Avid opAtom trouble

[Bouke (VideoToolShed)]

----- Original Message ----- 
From: "Jaka Bac" <jakabac at gmail.com>
To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
Sent: Friday, May 05, 2017 12:31 PM
Subject: Re: [FFmpeg-user] Avid opAtom trouble


> Hello
>
> This probably happens because the ffmpeg MXF muxer does not write some
> metadata that Avid expects.
>
> Namely the following entries in the CDCI descriptor will be missing:
> SampledWidth = 1920
> SampledHeight = 1080
>
> and this will be set (where 1920x1088 comes from):
> StoredWidth = 1920
> StoredHeight = 544
>
> But the actual problem I believe is the missing metadata.
>
> There is a patch floating around the mailing lists which fixes this (and
> also same problem which happens where OP1a XDCAM HD files generated by
> ffmpeg are imported into Avid editors).
> https://ffmpeg.org/pipermail/ffmpeg-devel/2016-June/194830.html
>
> Is there any reason why this patch is not accepted/applied?

Hi Jaka,
Is this a question for me? I can't answer it, just took the latest Zeranoe 
build...
thx,
Bouke

> Jaka
>
> On 2 May 2017 at 17:37, Bouke (VideoToolShed) <bouke at videotoolshed.com>
> wrote:
>
>> ----- Original Message ----- From: "Carl Eugen Hoyos" 
>> <ceffmpeg at gmail.com>
>> To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
>> Sent: Tuesday, May 02, 2017 4:31 PM
>> Subject: Re: [FFmpeg-user] Avid opAtom trouble
>>
>>
>> 2017-05-02 14:46 GMT+02:00 Bouke (VideoToolShed) <bouke at videotoolshed.com
>>> >:
>>>
>>> Toying around with Avid opAtom mxf, generating test clips.
>>>> When I look at the clip in Avid, the bin info shows a raster dimension 
>>>> of
>>>> 1920x1088, pixel aspect ratio of 1.007 (expected 1920x1080 / 1.000)
>>>> And of course, when editing the clip into a seqence, frameflex kicks 
>>>> in.
>>>>
>>>> same line but output to Mov and AMA the clip in does give the
>>>> expected result.
>>>>
>>>
>>> What happens if you use FFmpeg to remux the working mov file
>>> into mxf?
>>>
>>
>> -vcodec copy NEEDS the FPS, or FFmpeg bitches. When I add -r 25, it does
>> the re-wrap, but output gives the same trouble in Avid.
>>
>> What happens if you use FFmpeg to remux the broken mxf file
>>> into mov?
>>>
>>
>> FFmpeg reports the frame size has changed from 1088 to 1080, and all is
>> well.
>> (Except the UUID or something is copied over, so doing the dance twice to
>> two filenames makes Avid refuse to import both, as it 'knows' it 
>> already...)
>>
>> Nice details, with -vcodec copy also timecode comes across (From MXF to
>> MOV and vice-versa.)
>> Also the interlace flag is set without issue.
>>
>> Can you provide a working mxf file similar to the one FFmpeg
>>> produces?
>>>
>>
>> Yes, see here:
>> Download link
>> https://wetransfer.com/downloads/d35f135d397837227c965ee7b95
>> ea7bf20170502152440/018e64f2872c5c6e4de8bca6e08ca3f620170502152440/fd3691
>>
>>
>> Note, this is an AVID generated mixdown of the (good) AMA linked MOV. Tc
>> has changed to seqence TC (00:00:00:00)
>>
>> (I believe I remember what the issue is but would like to
>>> verify.)
>>>
>>
>> Let me know if you need more, and thanks!
>>
>> Bouke
>>
>> Carl Eugen
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>>>
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>>>
>>
>>
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