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2fc59ea8b3
Normally, the seek range is the minimum overlap of the cached ranges of each stream. But if one of the streams ends earlier, this leads to the seek range getting cut off, even if you could seek there. Change it so that EOF streams cannot restrict the end of the seek range. They can only extend it. This is the opposite from not-EOF streams, so they need to be handled separately. In particular, they get exluded from normal end range calculation, but when full EOF is reached, all streams are EOF, and the maximum end time can be used to set the seek end time. (In theory we could also take the max with the demuxer signaled total file duration, but let's not for now.) Also, if a stream is completely empty, essentially skip it, instead of considering the range unseekable. (Also, we don't need to mess with seek_start in this case, because it will be NOPTS and is skipped anyway.)