[FFmpeg-user] VC3 coding

Tim Nicholson tim.nicholson at bbc.co.uk
Tue Mar 29 15:25:04 CEST 2011

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

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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