[mythtv-users] Fwd: Re: Audio and video wildly out of sync for SD recordings

John Pilkington johnpilk222 at gmail.com
Tue Apr 21 08:20:56 UTC 2020


On 21/04/2020 08:45, John wrote:
> 
> 
> On 21/04/2020 08:12, UB40D wrote:
>> As of recently, a number of existing recordings have become 
>> essentially unwatchable because their video and audio are out of sync 
>> by what feels like a minute or more. I haven't actually measured but 
>> it's definitely closer to a minute than to a second, as in "that's the 
>> audio for the next scene, or the one after that".
>>
>> It seems that the HD recordings are still perfectly in sync and it's 
>> only the SD ones that are affected.
>>
>> The problem is only with the mythtv built-in player because if I open 
>> the same files in VLC then the audio and video are still perfectly in 
>> sync. But of course it's a pain to watch a recorded movie via VLC 
>> because the cut list is not honoured so I have to skip all the 
>> commercials all over again (not counting the faff about finding the 
>> actual file name and invoking VLC from the command line).
>>
>> Are there known a/v sync issues with the mythtv player? More 
>> importantly, are there any recommended fixes?

There have been sync problems, but mostly a slow drift rather than what 
you describe.  Perhaps your ad-skipping technique is different.

Try selecting different deinterlacers.  I think the 2x High Quality ones 
may be to blame.

>>
>> mythfrontend --version
>>
>> Please attach all output as a file in bug reports.
>>
>> MythTV Version : v32.0~master.202004182203.c1fb397~ubuntu20.04.1
>>
>> MythTV Branch : master
>>
>> Network Protocol : 91
>>
>> Library API : 32.20200101-1
>>
>> QT Version : 5.12.8
>>
>> Options compiled in:
>>
>>  linux profile use_hidesyms using_alsa using_oss using_pulse 
>> using_pulseoutput using_backend using_bindings_perl 
>> using_bindings_python using_bindings_php using_dvb using_firewire 
>> using_frontend using_hdhomerun using_vbox using_ceton using_hdpvr 
>> using_ivtv using_joystick_menu using_libcec using_libcrypto 
>> using_gnutls using_libdns_sd using_libfftw3 using_libxml2 using_lirc 
>> using_mheg using_opengl using_egl using_qtwebkit using_qtscript 
>> using_qtdbus using_taglib using_v4l2 using_x11 
>> using_libbluray_external using_xrandr using_profiletype 
>> using_systemd_notify using_systemd_journal using_bindings_perl 
>> using_bindings_python using_bindings_php using_freetype2 
>> using_mythtranscode using_opengl using_egl using_vaapi using_nvdec 
>> using_vdpau using_ffmpeg_threads using_mheg using_libass using_libxml2 
>> using_libmp3lame
>>
>>
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> 
> This problem occurred about a month ago in fixes 31 but in my use case 
> only effects software playback using ffmpeg, all the hardware playback 
> profiles are unaffected.
> 
> 
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