[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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