Presentation timestamp in AVStream->time_base units; the time at which
the decompressed packet will be presented to the user.
Can be AV_NOPTS_VALUE if it is not stored in the file.
pts MUST be larger or equal to dts as presentation cannot happen before
decompression, unless one wants to view hex dumps. Some formats misuse
the terms dts and pts/cts to mean something different. Such timestamps
must be converted to true pts/dts before they are stored in AVPacket.
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will be presented to the user. Can be AV_NOPTS_VALUE if it is not stored in the file. pts MUST be larger or equal to dts as presentation cannot happen before decompression, unless one wants to view hex dumps. Some formats misuse the terms dts and pts/cts to mean something different. Such timestamps must be converted to true pts/dts before they are stored in AVPacket.