id,summary,reporter,owner,description,type,status,priority,milestone,component,version,severity,resolution,keywords,cc,mlocked 3465,BBC HD on DVB-S dropped video frames. [ Not in mplayer/vnc ],anonymous,Isaac Richards,"I am seeing dropped frames in mythtv while playing back BBC HD-TV. this is an h.264 MBAFF stream, so has fairly heavy cpu requirements. I can play these streams back cleanly on the same machine under windows, and using vlc/mplayer. Looking at mythfrontend -v playback, frames are being dropped because the audio is 3 frames out of step with the video. Increasing the tolerance on this with a quick hack does not solve the problem. I am run tests on current SVN, using both FFMPEG (h264) and with the coreavc patch to give me more headroom on the cpu. Originally posted to mythtv-users. {{{ PC is core2duo e4300 [overclocked], graphics card nvidia 7300Ls. Cpu load is recorded as {cpu core0:core1} Windows2000: 2.7GHz : VLC: ffmpeg: no skiploopfilter: BBC-HD MBAFF h.264: CPU 60%:20% smooth. 2.7GHz : VLC: ffmpeg: skiploopfilter: BBC-HD MBAFF h.264: CPU 40%:10% smooth. 2.7GHz : MplayerClassic: coreavc: no skiploopfilter: BBC-HD MBAFF h.264: CPU 60%:30% smooth. 2.7GHz : MplayerClassic: coreavc: skiploopfilter: BBC-HD MBAFF h.264: CPU 40%:20% smooth. Ubuntu 7.04. . 2.7GHz : VLC: ffmpeg: no skiploopfilter: BBC-HD MBAFF h.264: CPU 100%:20% and dropped frames. 2.7GHz : VLC: ffmpeg: skiploopfilter: BBC-HD MBAFF h.264: CPUs 90%:20% smooth. 2.7GHz : Mythtv: ffmpeg: skiploopfilter: BBC-HD MBAFF h.264: CPU 90%:20% and dropped frames. 2.7GHz : Mythtv: coreavc: skiploopfilter: BBC-HD MBAFF h.264: CPU 40%:40% and dropped frames. So it looks as if I can reduce the quality of the ffmpeg decoding by using skiploopfilter to not max out the CPU, or use a non-free coreavc codec. However Mythtv is still doing somthing odd with the Sync between Audio and Video which is leading to it detecting the audio falling out of sync with the video, and then dropping video frames to resync. }}} ",defect,closed,minor,0.21,mythtv,head,medium,fixed,,,0