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2nd try for a keyframe definition 

based on richs comment


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@20647 b3059339-0415-0410-9bf9-f77b7e298cf2
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michael 2006-11-03 21:13:50 +00:00
parent e79daa507c
commit 8a881c1e55
1 changed files with 9 additions and 5 deletions
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DOCS/tech/nut.txt
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@ -42,11 +42,15 @@ MUST the specific part must be done to conform to this standard
SHOULD it is recommended to be done that way, but not strictly required SHOULD it is recommended to be done that way, but not strictly required
keyframe keyframe
a frame which can be decoded correctly on its own (=without using The nth frame is a keyframe if and only if frames n, n+1, ... in
information from any other frames) presentation order (that are all frames with a pts >= frame[n].pts) can
if no such frames exist in a codec (for example due to use of overlapped be decoded successfully without reference to frames prior n in storeage
transforms like the MDCT in an audio codec) then a keyframe shall be any order (that are all frames with a dts < frame[n].dts)
frame from which onward all frames can be decoded correctly if no such frames exist (for example due to use of overlapped transforms
like the MDCT in an audio codec) then the definition shall be extended
by droping n out of the set of frames which must be decodable, if this
is still insufficient then n+1 shall be droped, and so on until there is
a keyframe
(FIXME maybe move somewhere else?) (FIXME maybe move somewhere else?)