Mark Filipak (ffmpeg) wrote > On 2021-02-23 00:41, Carl Zwanzig wrote: > -snip- >> If you're starting with mpeg-ps or -ts, ... > > There's no such thing as PTS in mpeg-ts. The transport stream sets the SCR > (System Clock Reference) > (aka TB) but the PTSs are in the presentation stream, stored as integer > ticks of the SCR.
There is no such thing as /external/ timestamps, or container timestamps for MPEG-TS that govern the timing. Nor are there external timestamps any CFR container formats such as AVI. For AVI and MPEG-TS, MPEG-PS - the content can be VFR (using field or frame repeats), but the container is CFR only. Each coded frame cannot have variable display times in within a GOP. > I've been told (at doom9.org) that MKV (which is a TS) stores PTSs but I > find that hard to believe. Then read the MKV documentation, section 16 "External Timestamp Files". MKV is a container format. "TS" is usually reserved to denote for MPEG2-TS "TS for Transport Stream" (such as .ts, .m2ts, .mts) , not so loosely as any container stream. FFMpeg and modern video container formats have to be able to handle VFR without coding field or frame repeats - External timestamps are how PTS are controlled. This is what video players use to control playback. When you extract PTS from MKV using mkvextract or ffprobe, that's what you're getting - an external timestamps file. When you multiplex in timestamps file with mkvmerge, that's what you 're using - an external timestamps file. MP4, MOV, FLV, also use this method. -- Sent from: http://ffmpeg-users.933282.n4.nabble.com/ _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
