[FFmpeg-user] Avid opAtom trouble

[Jaka Bac]

Hi Bouke,

No the question was not for you :) But for people who are in position to
accept patches..
But probably this is the wrong mailing list.. I should have asked the
question on ffmpeg-devel

However I am fairly certain that this is the source of your problem...
Maybe I can do a test with your file with the patch applied...

Jaka

On 5 May 2017 at 14:15, Bouke (VideoToolShed) <bouke at videotoolshed.com>
wrote:

>
> ----- 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
>>> ea7bf20170502152440/018e64f2872c5c6e4de8bca6e08ca3f620170502
>>> 152440/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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