>> Subject: [mythtv] Problems with Bob Playback
>>
>>
>> I have a problem with Changeset 8510 where playback gets severely jerky
>> after a pause/play.
>>
>> Some specifics:
>>
>> Only appears to effect the bob deinterlacer (which is the most useful
>> one
>> IMHO)
>> I use PAL DVB in australia.
>> Is quite repeatable.
>> I am using svideo from an FX 5200.
>> Problem occurs for both Standard and libmpeg2 playback.
>> Skipping forward in playback does not appear to cause the problem.
>> Switching timestretch to 1.05 or 0.95 makes it smooth again, but
>> switching
>> back to 1.00 causes it to start jerking again.
> Rob R <[EMAIL PROTECTED]> wrote:
>
> What does your frontend log/console output show when it's being jerky?
This is what I found with mythfrontend -v playback:
[EMAIL PROTECTED]:~$ cat frontend.log
2006-01-15 08:56:14.719 Using runtime prefix = /usr
2006-01-15 08:56:14.748 New DB connection, total: 1
2006-01-15 08:56:14.755 Total desktop dim: 720x576, with 1 screen[s].
2006-01-15 08:56:14.759 Using screen 0, 720x576 at 0,0
2006-01-15 08:56:14.765 Enabling Settings Cache.
2006-01-15 08:56:14.766 Clearing Settings Cache.
2006-01-15 08:56:14.766 user: 105 effective user: 105 before privileged thread
2006-01-15 08:56:14.767 user: 105 effective user: 105 after privileged thread
2006-01-15 08:56:14.768 user: 105 effective user: 105 run_priv_thread
2006-01-15 08:56:14.770 Current Schema Version: 1121
2006-01-15 08:56:14.772 mythfrontend version: 0.19.20051208-1 www.mythtv.org
2006-01-15 08:56:14.772 Enabled verbose msgs: important general playback
2006-01-15 08:56:14.935 max_width: 720 max_height: 576
2006-01-15 08:56:14.937 lang0: eng
2006-01-15 08:56:14.938 lang: eng
2006-01-15 08:56:14.945 lang1: eng
2006-01-15 08:56:14.946 lang: eng
2006-01-15 08:56:15.038 Total desktop dim: 720x576, with 1 screen[s].
2006-01-15 08:56:15.041 Using screen 0, 720x576 at 0,0
2006-01-15 08:56:15.068 Switching to square mode (blue)
2006-01-15 08:56:15.386 New DB connection, total: 2
2006-01-15 08:56:15.389 Joystick disabled.
2006-01-15 08:56:15.401 Clearing Settings Cache for 'Language'.
2006-01-15 08:56:15.402 Clearing Settings Cache.
2006-01-15 08:56:15.431 Registering Internal as a media playback plugin.
2006-01-15 08:56:15.465 Registering MythDVD DVD Media Handler as a media handler
2006-01-15 08:56:15.466 Registering MythDVD VCD Media Handler as a media handler
2006-01-15 08:56:16.597 Registering MythMusic Media Handler as a media handler
SIP listening on IP Address 10.1.1.24:5060 NAT address 10.1.1.24
SIP: Cannot register; proxy, username or password not set
2006-01-15 08:56:17.095 Starting media monitor.
2006-01-15 08:56:20.665 All Programs
2006-01-15 08:56:20.928 Connecting to backend server: 127.0.0.1:6543 (try 1 of
5)
2006-01-15 08:56:20.936 Using protocol version 22
2006-01-15 08:56:21.568 TV: Attempting to change from None to
WatchingPreRecorded
2006-01-15 08:56:21.569 RingBuf(/myth/tv/1007_20060114142400.mpg):
OpenFile(/myth/tv/1007_20060114142400.mpg, 6)
0: start_time: 2397.503 duration: 115.916
1: start_time: 4281.229 duration: 115.910
2: start_time: 4281.245 duration: 115.916
stream: start_time: 26638.927 duration: 22218.418 bitrate=415 kb/s
2006-01-15 08:56:21.764 AFD: Stream #0, has id 0x1284 codec id DVB_VBI, type
Data at 0x0x81f4340
2006-01-15 08:56:21.765 AFD: data codec (Data)
2006-01-15 08:56:21.765 AFD: Stream #1, has id 0x1282 codec id MP3, type Audio
at 0x0x8256ff0
2006-01-15 08:56:21.765 AFD: Looking for decoder for MP3
2006-01-15 08:56:21.790 AFD: Opened codec 0x823cb40, id(MP3) type(Audio)
2006-01-15 08:56:21.790 AFD: Audio Track #1 is A/V stream #1 and has 2 channels
in the English language(6647399).
2006-01-15 08:56:21.790 AFD: Stream #2, has id 0x1281 codec id MPEG2VIDEO, type
Video at 0x0x823ce80
2006-01-15 08:56:21.795 detectInterlace(Detect Scan, Detect Scan, 25, 576)
->Interlaced Scan
2006-01-15 08:56:21.795 Interlaced: Interlaced Scan video_height: 576 fps: 25
2006-01-15 08:56:21.795 AFD: Looking for decoder for MPEG2VIDEO
2006-01-15 08:56:21.795 AFD: Opened codec 0x87816e0, id(MPEG2VIDEO) type(Video)
2006-01-15 08:56:21.795 RingBuf:CalcReadAheadThresh(15256 KB) -> threshhold(750
KB) readblocksize(250 KB)
2006-01-15 08:56:21.795 AFD: Selected track 1: English MP2 2ch (A/V Stream #1)
2006-01-15 08:56:21.795 AFD: Initializing audio parms from audio track #1
2006-01-15 08:56:21.795 AFD: Audio format changed
from id(NONE) -1Hz -1ch 0bps ; id(NONE) -1Hz
-1ch 0bps
to id( MP3) 48000Hz 2ch 16bps ; id( MP3) 48000Hz
2ch 16bps
2006-01-15 08:56:21.797 Opening audio device '/dev/dsp'.
2006-01-15 08:56:21.798 Opening OSS audio device '/dev/dsp'.
2006-01-15 08:56:21.807 Resyncing position map. posmapStarted = 0 livetv(0)
watchingRec(0)
2006-01-15 08:56:21.869 Position map filled from DB to: 32196
2006-01-15 08:56:21.870 SyncPositionMap prerecorded, from DB: 2684 entries
2006-01-15 08:56:21.871 SyncPositionMap, new totframes: 32196, new length:
1287, posMap size: 2684
2006-01-15 08:56:21.872 AFD: Position map found
2006-01-15 08:56:21.872 AFD: Successfully opened decoder for file:
"/myth/tv/1007_20060114142400.mpg". novideo(0)
2006-01-15 08:56:21.880 VideoOutputXv: ctor
2006-01-15 08:56:21.890 Over/underscan. V: 0, H: 0, XOff: 0, YOff: 0
2006-01-15 08:56:21.896 Snapping width to avoid scaling: dispwoff 720,
dispxoff: 0
2006-01-15 08:56:21.897 Image size. dispxoff 0, dispyoff: 72, dispwoff: 720,
disphoff: 432
2006-01-15 08:56:21.898 Image size. imgx 0, imgy: 0, imgw: 720, imgh: 576
2006-01-15 08:56:21.898 VideoOutputXv: Pixel dimensions: Screen 720x576, window
720x576
2006-01-15 08:56:21.899 VideoOutputXv: Estimated display dimensions: 244x195 mm
Aspect: 1.25128
2006-01-15 08:56:21.899 VideoOutputXv: Estimated window dimensions: 244x195 mm
Aspect: 1.25128
2006-01-15 08:56:21.901 VideoOutputXv: @ j=3 Looking for flag[s]: XvInputMask
XvImageMask
2006-01-15 08:56:21.902 VideoOutputXv: Adaptor: 0 has flag[s]: XvInputMask
XvImageMask
2006-01-15 08:56:21.903 VideoOutputXv: XVideo surface found on port 177
2006-01-15 08:56:21.904 VideoOutputXv: XVideo Format #0 is 'YUY2'
2006-01-15 08:56:21.905 VideoOutputXv: XVideo Format #1 is 'YV12'
2006-01-15 08:56:21.905 VideoOutputXv: XVideo Format #2 is 'UYVY'
2006-01-15 08:56:21.905 VideoOutputXv: XVideo Format #3 is 'I420'
2006-01-15 08:56:21.906 VideoOutputXv: Using XVideo Format 'I420'
2006-01-15 08:56:22.002 Snapping width to avoid scaling: dispwoff 720,
dispxoff: 0
2006-01-15 08:56:22.002 Image size. dispxoff 0, dispyoff: 85, dispwoff: 720,
disphoff: 405
2006-01-15 08:56:22.003 Image size. imgx 0, imgy: 0, imgw: 720, imgh: 576
2006-01-15 08:56:23.569 NVP: ClearAfterSeek()
2006-01-15 08:56:23.569 TV: StartPlayer(): took 1970 ms to start player.
2006-01-15 08:56:23.570 VideoOutputXv: ClearAfterSeek()
2006-01-15 08:56:23.571 VideoBuffers::DiscardFrames(0):
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
2006-01-15 08:56:23.571 VideoBuffers::DiscardFrames(0):
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -- done
2006-01-15 08:56:23.574 Realtime priority would require SUID as root.
2006-01-15 08:56:23.575 TV: Changing from None to WatchingPreRecorded
2006-01-15 08:56:23.601 AFD: DoFastForward(57 (1), do discard frames)
2006-01-15 08:56:23.601 Dec: DoFastForward(57 (1), do discard frames)
2006-01-15 08:56:23.602 AFD: SeekReset(60, 0, do flush, do discard)
2006-01-15 08:56:23.602 AFD: SeekReset() flushing
2006-01-15 08:56:23.602 VideoBuffers::DiscardFrames(1):
UAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
2006-01-15 08:56:23.602 VideoBuffers::DiscardFrames():
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -- done()
2006-01-15 08:56:23.602 VideoBuffers::DiscardFrames(1):
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -- done
2006-01-15 08:56:23.603 NVP: ClearAfterSeek()
2006-01-15 08:56:23.603 VideoOutputXv: ClearAfterSeek()
2006-01-15 08:56:23.603 VideoBuffers::DiscardFrames(0):
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
2006-01-15 08:56:23.603 VideoBuffers::DiscardFrames(0):
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA -- done
2006-01-15 08:56:23.733 Using deinterlace method bobdeint
2006-01-15 08:56:23.836 nVidiaVideoSync: VBlank ioctl did not work,
unimplemented in this driver?
2006-01-15 08:56:23.963 DRMVideoSync: Could not open device /dev/dri/card0, No
such device or address
2006-01-15 08:56:23.967 OpenGLVideoSync: GLX extensions: GLX_EXT_visual_info
GLX_EXT_visual_rating GLX_SGIX_fbconfig GLX_SGIX_pbuffer GLX_SGI_video_sync
GLX_SGI_swap_control GLX_ARB_multisample GLX_NV_float_buffer
GLX_ARB_get_proc_address
2006-01-15 08:56:23.968 OpenGLVideoSync: x,y -> 361, 289
2006-01-15 08:56:24.076 Using OpenGLVideoSync
2006-01-15 08:56:24.079 Set video sync frame interval to 40000
2006-01-15 08:56:24.079 Video sync method can't support double framerate
(refresh rate too low for bob deint)
2006-01-15 08:56:24.079 Set video sync frame interval to 40000
2006-01-15 08:56:24.082 Using deinterlace method onefield
2006-01-15 08:56:24.096 Using audio as timebase
2006-01-15 08:56:24.096 Video timing method: SGI OpenGL
2006-01-15 08:56:24.097 Refresh rate: 40000, frame interval: 40000
2006-01-15 08:56:24.219 NVP: Video is 3.01892 frames ahead of audio, dropping
frame.
2006-01-15 08:56:24.220 NVP: Video is 3.03292 frames ahead of audio, dropping
frame.
'video_output' mean = '37773.65', std. dev. = '8150.90', fps = '26.47'
'video_output' mean = '39796.64', std. dev. = '1510.01', fps = '25.13'
2006-01-15 08:56:35.228 NVP: Changing speed to 0
2006-01-15 08:56:35.228 rate: 25 speed: 1 skip: 1 = interval 40000
2006-01-15 08:56:35.229 Set video sync frame interval to 40000
2006-01-15 08:56:36.140 NVP: Play( 1.0, normal 1, unpause audio 1)
2006-01-15 08:56:36.143 NVP: Changing speed to 1
2006-01-15 08:56:36.143 NVP: DoPlay: rate: 25 speed: 1 skip: 1 => new interval
39999
2006-01-15 08:56:36.144 Set video sync frame interval to 39999
2006-01-15 08:56:36.144 Set video sync frame interval to 39999
2006-01-15 08:56:36.146 Using deinterlace method bobdeint
2006-01-15 08:56:36.146 NVP: Stretch Factor 1, allow passthru
2006-01-15 08:56:36.340 NVP: Video is 3.71842 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.343 NVP: Video is 5.22011 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.345 NVP: Video is 6.11513 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.351 NVP: Video is 6.54889 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.353 NVP: Video is 6.66169 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.356 NVP: Video is 6.50879 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.373 NVP: Video is 6.16285 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.376 NVP: Video is 5.75967 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.379 NVP: Video is 5.22601 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.381 NVP: Video is 4.59451 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.397 NVP: Video is 3.8834 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.399 NVP: Video is 3.1938 frames ahead of audio, dropping
frame.
'video_output' mean = '46785.88', std. dev. = '93627.05', fps = '21.37'
2006-01-15 08:56:36.779 NVP: Video is 3.39006 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.787 NVP: Video is 3.46756 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.790 NVP: Video is 3.32568 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.899 NVP: Video is 3.15353 frames ahead of audio, dropping
frame.
2006-01-15 08:56:36.902 NVP: Video is 3.04015 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.079 NVP: Video is 3.25408 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.081 NVP: Video is 3.24058 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.199 NVP: Video is 3.28066 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.202 NVP: Video is 3.26051 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.207 NVP: Video is 3.01413 frames ahead of audio, dropping
frame.
2006-01-15 08:56:37.462 NVP: Video is 3.39121 frames ahead of audio, dropping
frame.
[EMAIL PROTECTED]:~$
The interesting part seems to be this:
2006-01-15 08:56:24.079 Video sync method can't support double framerate
(refresh rate too low for bob deint)
Information about the modeline I am using from XFree log:
(**) NVIDIA(0): Mode "720x576i": 13.9 MHz, 15.6 kHz, 50.0 Hz (I)
The modeline from XF86Config-4:
# 720x576i 50 Hz
Modeline "720x576i" 13.875 720 744 808 888 576 582 588 625 -HSync -VSync
interlace
This is a 50 Hz interlaced modeline, so it should sync at 50 Hz which should be
perfect for displaying PAL DVB because it is interlaced 25 FPS as shown by the
following logs.
2006-01-15 08:56:21.795 detectInterlace(Detect Scan, Detect Scan, 25, 576)
->Interlaced Scan
2006-01-15 08:56:21.795 Interlaced: Interlaced Scan video_height: 576 fps: 25
I wondered if it was an issue because the modeline is interlaced, so I changed
it to a non interlaced version as follows:
(**) NVIDIA(0): Mode "720x576p": 27.8 MHz, 31.2 kHz, 50.0 Hz
(II) NVIDIA(0): Setting mode "720x576p"
Modeline "720x576p" 27.75 720 744 808 888 576 582 588 625 -HSync -VSync
The error message about the video sync method went away, but the problem with
the jerkiness still occurs after resuming from a pause. The "Video is n frames
ahead of audio , dropping frame" messages still appear.
Any Ideas?
Greg Frost
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