On 10-02-2019 05:36 PM, Kieran O Leary wrote:
What ssim command did you use, and why use this over a hash muxer like
framehash? I'm always on the lookout for losslessness verification methods.
The barebones command:
ffmpeg -i main -i ref -lavfi ssim -f null -
framehash will be sensitive to data layout, so that comparing the same
payload in planar vs packed format will yield different values. As the
SSIM filter only works with planar formats, avfilter will take care of
conversion, if needed, of both inputs.
Other than that, SSIM will present a rough measure of the shortfall if
the transcode isn't lossless. A framehash is either a match or not.
Gyan
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