I ended up writing an movWriter for Linux for this exact reason. I’m not
exactly sure how to translate Quicktime’s “90%” setting into quantizer and
bitrate parameters, but this should at least give you a bitrate and quality
level somewhere in the same neighborhood.
ffmpeg -r 24 -start_number 1001 -i /path/to/input_sequence.%04d.jpg -pix_fmt
yuvj420p -vcodec mjpeg -f mov -qmin 0 -qmax 1 /path/to/output/file.mov
You need the '-start_number' flag if your sequence starts at a frame other than
1 or if you only want to use a subset of a sequence. The '-r' flag sets the
frame rate of the source, and since no target rate is specified, the same will
be used for the output. You can also use 'yuvj422p' for the output '-pix_fmt'
value if you want 4:2:2 chroma subsampling.
Hope this helps.
-Nathan
From: Dan Rosen
Sent: Tuesday, April 30, 2013 4:49 PM
To: Foundry
Subject: [Nuke-users] ffmpeg Photo-JPEG QuickTimes
Hello,
Sorry to use this forum, but hopefully someone can point me in the right
direction to use ffmpeg (given that Nuke cannot properly write out a Photo-JPEG
QuickTime with correct color nor with 90% quality). I am trying to write out
frames from Nuke, with the lut applied in Nuke, and then compile them into
Photo-JPEG QuickTime with 90% quality. There's a brightness shift that appears
to be the pesky gama atom, but the file does not actually contain the atom so
there's no solid way to remove the shift. I am still testing so the shift maybe
something else. Fwiw, I have found good results with the ProRes codec (no
shift).
I have read up on the it online, but all results list "mpeg" as the format in
the Inspector window of QuickTime, but maybe it's correct since it lists
"Photo-Jpeg" in the format int the Properties window.
Any help would be much appreciated. Thanks!
-Dan
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