[FFmpeg-user] Avid opAtom trouble

Bouke (VideoToolShed) bouke at videotoolshed.com
Tue May 2 18:37:17 EEST 2017

----- 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 
(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

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!


> Carl Eugen
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