[FFmpeg-user] Avid DNxHD QTs dropped/doubled frame problem

[Jesse Lucas]

On 24/08/11 22:51 +0200, bouke wrote:
> 
> ----- Original Message ----- 
> From: "Jesse" <ffmpeg at neoprimitive.net>
> To: <ffmpeg-user at ffmpeg.org>
> Sent: Wednesday, August 24, 2011 9:44 PM
> Subject: [FFmpeg-user] Avid DNxHD QTs dropped/doubled frame problem
> 
> 
> > Hi, all.  I've run in to an issue when importing DNxHD Quicktime
> > movies made with ffmpeg in to Avid Media Composer.
> > The source material are image sequences rendered at 24 FPS.
> >
> > The output format is DNxHD 36 Mb/s, 23.976 FPS.
> >
> > I am doing my encoding with ffmpeg SVN-r20372 packaged with Fedora
> > Core 12.
> >
> > All output movies from ffmpeg play back with the correct number of
> > frames in mplayer on Linux, and in Quicktime on a Mac.
> >
> > However, when the movies are imported in to an Avid Media Composer
> > project set to DNxHD36, 23.976 FPS, movies with frame lengths ending
> > in 0, 3, and 6 (e.g.  10, 13, 16, 20, 23, ...), have a doubled first
> > frame, and a missing last frame.
> 
> 
> Did you try 'ignoreQTrate True' in the Console in Avid? And/or AMA in 
> instead of import?
> Might solve something..
> (but i use WriteAvidMXF and mediatool the material in, way faster)

Thanks, Bouke.  Setting 'ignoreQTRate' to 'true' does seem to solve 
the problem on import for the time being.  This gives me time to look 
in to the feasibility of deploying a new ffmpeg binary built with Mike 
Root's patch.

Are there wider implications for our project if we just leave this 
option set to true in the Avid?  This may be veering in to OT land 
(e.g. Avid support), so I guess, if you have any advice, reply 
off-list.

Cheers,

J