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ah. isn't it always the way? You hit send, and then find the
answer!
At least part of it. The codec to use is "libx264rgb" instead of
"libx264".
With a pixel format "bgr24", it will produce a movie which bino
says:
bino: [inf] Input:
bino: [inf] Video 1920x2400, 1.6:1:
1920x2400-0.8:1-bgra32-srgb
it's not 10-bit, however. So that's the next challenge.
ie: ffmpeg command is roughly:
$ ffmpeg -i
img.%04d.exr -c:v libx264rgb -r 25 -pix_fmt bgr24 output_tb.mp4
I'd still be interested in any details about sRGB playback (as the
comments
in the code suggest there's an issue there, which would be
interesting to
hear about).
with thanks,
ben.
On 01/18/15 17:16, ben simons wrote:
Hi,
I'm trying to generate a movie with ffmpeg (and x264, but it
doesn't need to be)
which will playback in bino in sRGB or bt.709 colour space.
However, every movie seems to be interpreted by bino as being in
bt.601.
eg. ffmpeg option: -pix_fmt = yuvj420p should spec bt.709
but the bino says it's 601, eg:
bino: [inf] Input:
bino: [inf] Video 1920x2400, 1.6:1:
1920x2400-0.8:1-yuv420p-601-mpeg-l
Can someone give an example of a (linux) ffmpeg config which will
create a movie
which bino will play in 'sRGB' or 'bt.709' colorspace?
eg. here's roughly the ffmpeg command (The first 3 shell
variables support experimentation)
it's in a bash shell script, but this is basically it in 4 lines.
Input image filenames are:
inputImageSeq.0001.exr to inputImageSeq.9999.exr
CODEC="libx264
-probesize 2G -analyzeduration 2G"
OPTIONS="-r 25 -profile:v high10 -pix_fmt yuvj420p -tune
zerolatency -tune fastdecode"
TEST_OPTIONS="-ss 32 -t 5" # eg skip into seq 32sec,
duration 5sec
ffmpeg -y -framerate 25 -s 1920x2400 -i
inputImageSeq.%04d.exr -c:v $CODEC $OPTIONS $TEST_OPTIONS
outputMovie_tb.mp4
There appears to be some comments about 'color_space' in:
src/media_object.cpp
src/video_output.cpp
and there's a comment about issues with a broken SRGB texture
implementation.
Is there an issue with sRGB? Is anyone playing sRGB, and if so,
could you please
report the working codec & pixel format? or the ffmpeg command
you used?
I have found a way to generate a 10-bit sRGB movie via Nuke (use
an "Uncompressed
RGB 10-bit" codec, saved in an .avi container) but i'm still
wondering if someone could
perhaps help describe/explain the current situation with sRGB
(textures) and bino?
bino: [inf] Input:
bino: [inf] Video 1920x2400, 1.6:1:
1920x2400-0.8:1-bgra32-srgb
Unfortunately, this format is uncompressed, so it doesn't play
back at 25fps.
Nuke does not appear to offer another bgra32 pixel format, so it
looks like it's
back to ffmpeg itself.. Still, seeing bino report the above is
encouraging.
thanks,
ben.
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