Hi, I am trying to study a gstreamer plugin that is using libmpeg2 to decode the obvious. I have a few questions on the libmpeg2 side of things.
Through my understanding of the mpeg2 standard, the coding order is not the same as the display order (atleast when there are B-Frames in the stream), i.e. the order in which frames are encoded in a stream are not the order in which they are displayed. And that the decoder, will actually give out frames in the display order after reordering. The documentation available here, http://tonelli.sns.it/pub/mennucc1/mplayer/debug/tmp/mpeg2dec-0.4.0b/doc/libmpeg2.txt says that mpeg2_tag_picture, allows you to associate a timestamp (or tag) to the next picture that starts after the tag was set. Here i would like to know, whether the tag is associated with the next picture in the encoded stream, or the next picture that is returned as decoded and ready to be displayed. Where, in the former case, due to reordering that particular timestamped frame could come after a few frames. Secondly, in the structure, typedef struct mpeg2_info_s { ... ... const mpeg2_picture_t * current_picture; const mpeg2_picture_t * display_picture; ... ... } mpeg2_info_t; What pictures do current_picture and display_picture variables hold. Through my study i have found that display_picture holds the picture that currently has to be displayed. What does current_picture hold? Please comment. Thanks & Regards ~Sameer ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Libmpeg2-devel mailing list Libmpeg2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libmpeg2-devel
