Jframe: Difference between revisions

Latest revision as of 23:44, 30 May 2007

Redirect to:

@@ Line 1: / Line 1: @@
-A j-frame (also known as a j-type frame) is a type of frame similar to an i-frame used in microsofts mpeg4 variation codec [[WMV2]] and the same coding method (with the different header) is used in [[WMV3]] Complex Profile under the name "X8".
+#redirect [[XINTRA8]]
-[[MPlayer]] on x86 can play files containing these frames using a binary codec. ffmpeg can also play files containing j-frames, but, those frames will be skipped. j-frames have not been reverse engineered, so there is no documentation available. If a stream contains j-type frames the j-type bit will be set in the streams extradata.
-The main differences between j-frames and i-frames:
-# They are not derived from MPEG-4 standard
-# Picture is coded as blocks, not as macroblocks
-# Each frame may use its own Huffman codes