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It's not conversion. Rather, this filter is used for video where you don't know whether the pixels are video or full range, or whether the alpha is premultiplie
by brigade 1y ago
It's not conversion. Rather, this filter is used for video where you don't know whether the pixels are video or full range, or whether the alpha is premultiplied, and determining that information. Usually so you can tag it correctly in metadata.
And the function in question is specifically for the color range part.
- cpncrunch 1y agoIt's still unclear from your explanation how it's actually used in practice. I run thousands of ffmpeg conversions every day, so it would be useful to know how/if this is likely to help me. Are you saying that it's run once during a conversion as part of the process? Or that it's a specific flag that you give, it then runs this function, and returns output on the console? (Either of those would be a one-time affair, so would likely result in close to zero speed improvement in the real world).
- brigade 1y agoThis is a new filter that hasn’t even been committed yet, it only runs if explicitly specified, and would only ever be specified by someone that already knows that they don’t know the characteristics of their video. So you wouldn’t ever run this.
- cpncrunch 1y agoThank you, exactly what I was looking for.