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

[John]

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?
>
> 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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