created by makemkv, "mkvalidator" outputs a lot of warnings and error. For example:
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WRN0C0: First Block for video track #1 in Cluster at 32359660555 is not a keyframe
WRN0C0: First Block for video track #1 in Cluster at 32363072132 is not a keyframe
WRN0C0: First Block for video track #1 in Cluster at 32368701614 is not a keyframe
[...]
ERR0B1: SimpleBlock at 212916 track #3 is not a keyframe
ERR0B1: SimpleBlock at 458327698 track #3 is not a keyframe
[...]
Then, in the particular example I am using, the third track contains PGS subtitles. Aren't subtitles always encoded independently from previous frames and as such always matroska keyframes?