[FFmpeg-user] Converting a 23.98p source to 29.97i ProRes w/interlaced 3:2 pulldown?
kevwells at hotmail.co.uk
Sun Oct 25 14:46:32 CET 2015
> From: melmatsuoka at gmail.com
> Date: Sat, 24 Oct 2015 20:49:11 -1000
> To: ffmpeg-user at ffmpeg.org
> Subject: [FFmpeg-user] Converting a 23.98p source to 29.97i ProRes w/interlaced 3:2 pulldown?
> I'm trying to convert 23.98p ProRes QuickTime (.mov) files to interlaced 29.97 ProRes files, and I'd like to do the frame-rate conversion to 29.97i by using a 3:2 pulldown cadence (upper-field first).
> I can't seem to figure out how to do this in FFmpeg 2.8 on Mac OS X 10.10.5. I am able to convert the 23.98 source to 29.97, and the encoded file *is* technically interlaced, but the actual frame-rate conversion to 29.97 seems to be happening using progressive pulldown (i.e. repeated full frames), even though the file itself is flagged as having UFF interlacing.
> Because the 29.97 files are intended for broadcast playback, I need to be able to convert the 23.98 master QuickTime files to broadcast-spec'ed, interlaced 29.97 ProRes files with true interlaced 3:2 pulldown, so that they look smooth when played on-air.
> Here's the command line that I've come up with so far.
> ffmpeg -ss 7.0 -t 30.0 -i SOURCFILE.mov -timecode 01:00:00:00 -acodec pcm_s16le -vcodec prores_ks -vprofile hq -flags +ildct -r 29.97 -movflags +write_colr -color_primaries bt709 -color_trc bt709 -colorspace bt709 OUTFILE.mov
> This command line skips the 7 second slate/leader at the head of the spot, and encodes exactly 30 seconds of the file after that, while re-striping the output file with a new timecode track starting at 1 hour. I'm also using the Kostya ProRes encoder, as I have been led to believe that the other ProRes encoders in FFmpeg don't support interlaced output?
> Everything seems to encode as I'd like it to, with the exception of the lack of interlaced pulldown. I've spent all day scouring the web, as well as a dump of "ffmpeg -h full", but I can't seem to figure out how to get this to work. Any help would be most appreciated.
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I use something like this, need to add in the audio stuff, but should lead you in the right direction:
ffmpeg -i inputFile -vf "telecine,setpts=N/(30000/1001*TB),fieldorder=bff" -r ntsc -vcodec prores -profile hq -vtag apch -f mov -pix_fmt yuv422p10le outputFile
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