This is a continuation of my search for enlightenment as to why on playing certain MPEG2 files, mplayer cannot maintain A-V sync. The two logs (edited for size) attached to this post are from: mplayer -ao alsa::device=hw=0.3 -vo vdpau -vc ffmpeg2 -alang ENG foo.MPEG2 Fox40-test-MPEG2-beforedd.log is from the first few minutes of a program recorded OTA with HD HomeRun. Fox40-test-MPEG2-afterdd.log is the first few minutes of the same file cut off using dd: dd bs=1M count=100 skip=0 if=Fox40-test-beforedd.MPEG2 \ of=Fox40-test-afterdd.MPEG2 On playback of Fox40-test-beforedd.MPEG2 mplayer is unable to maintain A-V sync and drops frames (see log). On playback of Fox40-test-afterdd.MPEG2, mplayer mainains A-V sync, and there are no dropped frames. In other words, dd appears to solve the A-V sync problem. (cp does not) I'd really like to understand why this happens. Some readers will recognize this as a restart of my thread "audio leads video". My PVR was out of commission for a couple of weeks (MB replaced). I'm still trying to understand the problem. FWIW, this happens with only one channel, so it may be something in their transmission. On all recordings, sound and video are great, and only Fox40 has sync problems. Thanks.
MPlayer SVN-r29251 (C) 2000-2009 MPlayer Team Playing test.mp2. TS file format detected. VIDEO MPEG2(pid=49) AUDIO A52(pid=52) NO SUBS (yet)! PROGRAM N. 3 VIDEO: MPEG2 1280x720 (aspect 3) 59.940 fps 19392.8 kbps (2424.1 kbyte/s) ========================================================================== Forced video codec: ffmpeg2 Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Unsupported PixelFormat -1 Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2) ========================================================================== ========================================================================== Opening audio decoder: [liba52] AC3 decoding with liba52 Using SSE optimized IMDCT transform Using MMX optimized resampler AUDIO: 48000 Hz, 2 ch, s16le, 448.0 kbit/29.17% (ratio: 56000->192000) Selected audio codec: [a52] afm: liba52 (AC3-liba52) ========================================================================== AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) Starting playback... VDec: vo config request - 1280 x 720 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. VO: [vdpau] 1280x720 => 1280x720 Planar YV12 A:90168.7 V: 0.0 A-V:90168.703 ct: 0.000 1/ 1 ??% ??% ??,?% 0 0 ... (skipped 3117) A:90221.2 V:90221.2 A-V: 0.007 ct: -0.474 3119/3119 14% 51% 1.0% 0 0 a52: CRC check failed! A:90221.2 V:90221.2 A-V: 0.006 ct: -0.473 3120/3120 14% 51% 1.0% 0 0 ... (skipped 52) A:90221.5 V:90222.0 A-V: -0.508 ct: -0.524 3172/3172 14% 52% 1.0% 0 0 Exiting... (End of file)
MPlayer SVN-r29251 (C) 2000-2009 MPlayer Team Playing Saviors.mp2. TS file format detected. VIDEO MPEG2(pid=49) AUDIO A52(pid=52) NO SUBS (yet)! PROGRAM N. 3 VIDEO: MPEG2 1280x720 (aspect 3) 59.940 fps 19392.8 kbps (2424.1 kbyte/s) ========================================================================== Forced video codec: ffmpeg2 Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family Unsupported PixelFormat -1 Selected video codec: [ffmpeg2] vfm: ffmpeg (FFmpeg MPEG-2) ========================================================================== ========================================================================== Opening audio decoder: [liba52] AC3 decoding with liba52 Using SSE optimized IMDCT transform Using MMX optimized resampler AUDIO: 48000 Hz, 2 ch, s16le, 448.0 kbit/29.17% (ratio: 56000->192000) Selected audio codec: [a52] afm: liba52 (AC3-liba52) ========================================================================== AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) Starting playback... VDec: vo config request - 1280 x 720 (preferred colorspace: Planar YV12) VDec: using Planar YV12 as output csp (no 0) Movie-Aspect is 1.78:1 - prescaling to correct movie aspect. VO: [vdpau] 1280x720 => 1280x720 Planar YV12 A:90168.7 V: 0.0 A-V:90168.719 ct: 0.000 1/ 1 ??% ??% ??,?% 0 0 ... (skipped 5393) A:90259.6 V:90259.1 A-V: 0.462 ct: -0.475 5395/5395 13% 64% 2.6% 1556 0 Exiting... (Quit)
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