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Nov 23, 2009, 11:01 AM
Post #2 of 5
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Re: Ticket #7644: Playback of interlaced TV broken (from r22881)
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#7644: Playback of interlaced TV broken (from r22881)
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Reporter: Davin McCall <davmac@…> | Owner: janne
Type: defect | Status: new
Priority: critical | Milestone: unknown
Component: MythTV - Video Playback | Version: head
Severity: high | Mlocked: 0
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Comment(by anonymous):
Replying to [ticket:7644 Davin McCall <davmac@…>]:
> Playback of interlaced TV (live TV or recording) is broken. Video plays
too quickly and goes out of sync with audio. This occurs since r22881,
however, that change is not actually faulty, it just exposes an additional
bug.
>
> The problem is that m_double_framerate (in
mythtv/libs/libmythtv/NuppelVideoPlayer.cpp) doesn't get set correctly
when an interlaced scan mode is set, since it is initialized to interlaced
and SetScanType returns without correctly setting m_double_framerate if
the scan type matches the current type.
>
> As a result m_double_framerate is false and the AVSync method doesn't
recognize that two fields need to be displayed each frame interval.
I, too, have seen this problem on select ATSC broadcast channels. The
problem was not present in release 0.21, and has been visible since
upgrading to 0.22 yesterday. I'll try applying the patch and report on
whether it works.
Here are the statistics reported by FFMPEG for a clip exhibiting problem:
[scott [at] eowy myth_playback_issue]$ ffmpeg -vstats -i
5071_20091120160000.mpg
FFmpeg version 0.5-30.fc9, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: --prefix=/usr --libdir=/usr/lib --shlibdir=/usr/lib
--mandir=/usr/share/man --enable-shared --enable-gpl --enable-postproc
--enable-swscale --enable-avfilter --enable-avfilter-lavf --enable-
pthreads --enable-x11grab --enable-vdpau --disable-avisynth --disable-
libamr-nb --disable-libamr-wb --enable-libdc1394 --enable-libfaac
--enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame
--enable-libspeex --enable-libtheora --enable-libvorbis --enable-libx264
--enable-libxvid --extra-cflags=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386
-mtune=generic -fasynchronous-unwind-tables --disable-stripping --extra-
cflags=-I/usr/include/nvidia-graphics --extra-ldflags=-L/usr/lib/nvidia-
graphics
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 0 / 52.20. 0
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 4. 0 / 0. 4. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Mar 17 2009 07:05:36, gcc: 4.3.0 20080428 (Red Hat 4.3.0-8)
Seems stream 0 codec frame rate differs from container frame rate: 119.88
(120000/1001) -> 59.94 (60000/1001)
Input #0, mpegts, from '5071_20091120160000.mpg':
Duration: 00:59:56.35, start: 50395.716533, bitrate: 11657 kb/s
Program 1
Stream #0.0[0x31]: Video: mpeg2video, yuv420p, 1280x720 [PAR 1:1 DAR
16:9], 17808 kb/s, 59.94 tbr, 90k tbn, 119.88 tbc
Stream #0.1[0x34](eng): Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s
Stream #0.2[0x35](spa): Audio: ac3, 48000 Hz, mono, s16, 96 kb/s
Stream #0.3[0x36](fre): Audio: ac3, 0 channels, s16
At least one output file must be specified
--
Ticket URL: <http://svn.mythtv.org/trac/ticket/7644#comment:1>
MythTV <http://www.mythtv.org/>
MythTV
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