On Sunday, June 12, 2016 1:58:00 PM CDT ibrahim wrote: > the image format for the image sequence should be a lossless compressed > or uncompressed free/libre format and it should preserve the significant > properties of video such as interlacing, colour space (without any > colour conversion), chroma subsampling and bitdepth.
That's asking a bit much. I don't think you're going to find a single solution that will accomidate every single scan type + color space + color sampling + bit-depth combination. > I know that no > such image format exists. png is my best option but: > -png is up to 8bpc (besides alpha) RGB. PNG can accomidate 16 bit (not sure if implemented in ffmpeg though). > besides YUV to RGB colour space > conversion, i will loose information for 10 bpc formats such as prores > 4:2:2 when represented as 8bpc. Is there a free/libre lossless image > format that can handle greater bitdepths? since all displays are RGB, a > color conversion to RGB is eventually mandatory, at least when > displaying the video/image. does anybody have a prediction that the > display technology will switch to anything other than RGB? and my > approach is that it would be ok to transcode to an RGB image format > since more video codecs are expected to be RGB sometime in the future > and the RGB image sequence can be transcoded to a RGB video format for > access, and even for migrating to another preservation format without > further color space conversion. what do you think? how justifiable is > this approach? How good ffmpeg handle color space conversion for png > image sequence? Are there any free/libre image format to preserve > original YUV color space, original chroma subsampling and bitdepth? For archiving in an image sequence, I would just recommend converting to a high bit-depth format with a linear gamma. OpenEXR is available under a modified BSD license and is supported by ffmpeg. It was basically designed as an archival interchange format. The bit-depth and dynamic range is big enough that no color information is ever going to get lost. -Reuben _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
