Mark Filipak wrote: > Since 00305.m2ts is AVC encoded, there are I slices in it but not I frames > -- I P & B frames are > MPEG-1 & MPEG-2.
That's not completely correct. I suggest you read a bit about basic concepts and terminology of H.264 (AVC). I'll try to summarize it: H.264 (AVC) has I-frames, too. These frames may use only spatial prediction, i.e. they contain only intra-predicted macroblocks. P-frames and B-frames may use both spatial and temporal prediction, i.e. they contain inter-predicted and intra-predicted macroblocks (where P-frames are restricted to forward prediction, and B-frames may use both forward and backward prediction). Note that a slice is basically just a group of macroblocks that describe a certain region of a frame and share some common properties. For example, an "I-slice" is a group of macroblocks that use only spatial prediction. And an I-frame contains only intra-predicted slices (I-slices), while a P-frame may contain P-slices and I-slices, and a B-frame may contain all three types of slices. Finally, there are IDR-frames. These are I-frames that signify a closed GOP. That is, temporal predictions may not cross the boundary of an IDR-frame. I-frames that are part of an open GOP are not IDR-frames. Best regards -- Oliver _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
