Start time of the stream in real world time, in microseconds
since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the
stream was captured at this real world time.
- muxing: Set by the caller before avformat_write_header(). If set to
either 0 or AV_NOPTS_VALUE, then the current wall-time will
be used.
- demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that
the value may become known after some number of frames
have been received.
Start time of the stream in real world time, in microseconds since the Unix epoch (00:00 1st January 1970). That is, pts=0 in the stream was captured at this real world time. - muxing: Set by the caller before avformat_write_header(). If set to either 0 or AV_NOPTS_VALUE, then the current wall-time will be used. - demuxing: Set by libavformat. AV_NOPTS_VALUE if unknown. Note that the value may become known after some number of frames have been received.