[FFmpeg-user] DNxHD / DNxHR conversions for Avid

Paul B Mahol onemda at gmail.com
Tue Apr 12 22:24:04 EEST 2022

On Tue, Apr 12, 2022 at 2:13 AM Media Mouth <communque at gmail.com> wrote:

> We've got a bunch of mp4s that need converting to Avid-native MXF  that
> they can be dropped into a ../Avid MediaFiles/MXF folder without being
> ingested.
> (In other words, bypassing the need to importing/transcoding and avoiding
> using AMA+transcoding)
> The mp4 sources are 29.97, 23.976 and 25fps  (at 3840x2160)
> The Avid project is DNxHD36 1920x1080 @ 24fps, and the mandate is to not
> mix frame rates on the timeline.
> So the current workflow involves using Resolve, where we select the mp4s
> and Clip Attributes > Video Frame 24
> then throw onto a timeline and export using format MXF Op-Atom using Codec
> DNxHD 1080p 36 8bit video
> That generates files that can be drag and dropped to Avid Media folders
> which then show up in bins via importing the msmMMOB.mdb (per folder media
> database)
> I'm trying to achieve the same Avid-compatible MXFs using FFmpeg
> So far I haven't figure out how do DNxHD w/o getting an error in FFmpeg
> And my attempts to do DNxHR, while successful in terms of getting a
> playable file and no errors on the FFmpeg,
> do cause an error on the Avid side if you drop them directly in an Avid
> MediaFiles/MXF folder
> Most successful FFMPEG command (the one that resulted in the above error)
> so far has been this...
> ffmpeg -i /path/to/source.mp4 \
> -c:v dnxhd \
> -vf 'scale=1920:1080,fps=24/1,format=yuv422p' \
> -profile:v dnxhr_lb \
> /path/to/dest.mxf

I see nowhere here presentation of the error, either ffmpeg one or avid one.

Do note that ffmpeg's mxf muxer is not very polished in current version.

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