[FFmpeg-user] VC3 coding

Tim Nicholson tim.nicholson at bbc.co.uk
Tue Mar 29 16:17:38 CEST 2011

On 29/03/11 14:25, Tim Nicholson wrote:
> I have had VC3 coding running happily with:-
> ffmpeg -i <infile> -s 1920x1080 -r 25 -vcodec dnxhd -b 120Mbps -f
> rawvideo -flags +ildct out.dnx
> Which I then mxf wrap and all is good.
> After updating ffmpeg to a very recent git I modified the line to
> ffmpeg -i <infile> -s 1920x1080 -r 25 -vcodec dnxhd -b 120M -f rawvideo
> -flags +ildct out.dnx

Interestingly removing '-flags +ildct' gives me a full frame picture,
but lacking in interlace and with ragged edges (the previous version was
interlaced correctly on the bit that was visible).

> To reflect the API change for bit rate.
> Which processes happily. However after mxfwrapping and inspecting in
> Avid I only get the top half of the picture...
> Since the only change had been ffmpeg, and the minor tweak to the
> command line I believe that this must be due to some internal change in
> ffmpeg. The question is what?


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