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dpx sequence to Pro Res HQ dropping frames

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Kurt Outwater
dpx sequence to Pro Res HQ dropping frames
on Apr 18, 2012 at 5:28:42 pm

I'm trying to make a prores hq from dpx frames and when I select 23.98 or 24FPS as the frame rate I get dropped frames. At 25fps it works great. Here is the command:

ffmpeg -f image2 -i e:\sourcefile.0%05d.dpx -r 23.98 -b 50000000 -s 1920x1080 -vcodec prores -profile 3 -acodec pcm_s241e e:\test_output5.mov

Any help would be greatly appreciated! I'd really like to start using ffmpeg...it seems like a great program.


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Reuben Martin
Re: dpx sequence to Pro Res HQ dropping frames
on Apr 19, 2012 at 2:20:15 am

An image sequence input obviously has no frame rate information included in it, so ffmpeg by default assumes that the input frame rate is 25fps. You have set the output rate to 24, so it the fames get dropped from frame rate conversion.

The order of options in ffmpeg matters:
-- An -r option set after the -i option sets output frame rate.
-- An -r option set before the -i option set the input frame rate.

So move your -r option around.

Also, 23.98 is just an approximation. The anal-retentive-correct way to specify an NTSC-FILM fame rate is "-r 24000/1001"


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Kurt Outwater
Re: dpx sequence to Pro Res HQ dropping frames
on Apr 20, 2012 at 7:14:21 pm

Thanks that worked prefectly!


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