< byte position in stream, -1 if unknown/*** Time difference in AVStream->time_base units from the pts of this* packet to the point at which the output from the decoder has converged* independent from the availability of previous frames. That is, the* frames are virtually identical no matter if decoding started from* the very first frame or from this keyframe.* Is AV_NOPTS_VALUE if unknown.* This field is not the display duration of the current packet.* This field has no meaning if the packet does not have AV_PKT_FLAG_KEY* set.** The purpose of this field is to allow seeking in streams that have no* keyframes in the conventional sense. It corresponds to the* recovery point SEI in H.264 and match_time_delta in NUT. It is also* essential for some types of subtitle streams to ensure that all* subtitles are correctly displayed after seeking.*/int64_t convergence_duration;} AVPacket;
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