Author: michael Date: Mon Nov 13 16:23:45 2006 New Revision: 20886 Modified: trunk/DOCS/tech/nut.txt Log: pts definition by mans dts definition and decode_delay definition by me Modified: trunk/DOCS/tech/nut.txt ============================================================================== --- trunk/DOCS/tech/nut.txt (original) +++ trunk/DOCS/tech/nut.txt Mon Nov 13 16:23:45 2006 @@ -68,6 +68,11 @@ keyframe status of the current frame but instead just set the frame as non keyframe (FIXME maybe move somewhere else?) +pts + presentation time of the first frame/sample that is completed by decoding + the coded frame. +dts + of a frame is the time when it is input into the decoder Syntax: @@ -542,10 +547,13 @@ MUST be <16 decode_delay - maximum time between input and output for a codec, used to generate - dts from pts - is set to 0 for streams without B-frames, and set to 1 for streams with - B-frames, may be larger for future codecs + size of the reordering buffer used to convert pts to dts + codecs which dont support b frames normaly use 0 + mpeg1/mpeg2 style codecs with b frames use 1 + h264 style b pyramid uses 2 + h264 and future codecs might need values >2 + audio codecs generally use 0 (we arent aware of any which doesnt + but its theoretically possible that one exists which needs it >0) decode_delay MUST NOT be set higher than necessary for a codec. stream_flags