Hi, have a look at the docs here:
" int AVCodecContext::ticks_per_frame For some codecs, the time base is closer to the field rate than the frame rate. Most notably, H.264 and MPEG-2 specify time_base as half of frame duration if no telecine is used ... Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2. " Hope that helps... Christian Sean McAllister schrieb: > Hmmm I'm not necessarily seeing where it explains it, what am I missing? > > On Sat, Jan 9, 2010 at 10:55 PM, Sean McAllister <[email protected]> wrote: > >> Excellent! Thanks! >> >> >> On Sat, Jan 9, 2010 at 10:22 PM, Art Clarke <[email protected]> wrote: >> >>> On Sat, Jan 9, 2010 at 9:08 PM, Sean McAllister <[email protected]> >>> wrote: >>> >>>> So I'm reading the documentation on the AVCodecContext struct: >>>> >>>> >>>> >>> http://cekirdek.pardus.org.tr/~ismail/ffmpeg-docs/structAVCodecContext.html#b7bfeb9fa5840aac090e2b0bd0ef7589<http://cekirdek.pardus.org.tr/%7Eismail/ffmpeg-docs/structAVCodecContext.html#b7bfeb9fa5840aac090e2b0bd0ef7589> >>> < >>> http://cekirdek.pardus.org.tr/%7Eismail/ffmpeg-docs/structAVCodecContext.html#b7bfeb9fa5840aac090e2b0bd0ef7589 >>>> >>>> It says that time_stamp should be 1.0/framerate, but I'm checking out >>> this >>>> video that's 29.<whatever> FPs, and I get >>>> a time_stamp of .016683 which corresponds to 59.94FPS, ie time_stamp = >>>> 1.0/(2.0*frame_rate). Which is correct? >>>> >>>> Sean >>>> >>> This might help: >>> http://wiki.xuggle.com/Concepts >>> >>> It explains the concepts of time stamps, time bases and framerate as used >>> in >>> Xuggler -- but Xuggler just wraps FFmpeg's libav library so the same >>> concepts apply. >>> >>> - Art >>> >>> -- >>> http://www.xuggle.com/ >>> xu‧ggle (zŭ' gl) v. To freely encode, decode, and experience audio and >>> video. >>> >>> Use Xuggle to get the power of FFmpeg in Java. >>> _______________________________________________ >>> libav-user mailing list >>> [email protected] >>> https://lists.mplayerhq.hu/mailman/listinfo/libav-user >>> >> > _______________________________________________ > libav-user mailing list > [email protected] > https://lists.mplayerhq.hu/mailman/listinfo/libav-user _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
