Dear list, I have an occasional problem whereby "an event" occurs following which all recordings made using the affected tuner have no usable audio.
Tuner: HVR1900. "Event": no clue. All recordings made using MythTV. Audio symptoms: affected recordings, when starting or stopping playback (at any location within the recording) produce a loud popping noise followed by silence. So in more detail: - press Play: <POP> video starts, no audio - press Pause: <POP> video freezes - press Play again: <POP> video resumes, no audio - press Fast Forward: <POP> video fast-forwards - press Play: <POP> video resumes at normal speed, no audio - press Stop: <POP> If this were an analogue system I'd suspect that audio is being recorded with a large DC offset that saturates the amp; does that ring any bells? What fixes it (for subsequent recordings) is unloading and reloading the pvrusb2 module, like so: ==== #!/bin/bash /sbin/stop mythtv-backend /sbin/rmmod pvrusb2 /bin/sleep 5s /sbin/modprobe pvrusb2 while true do [ -h /dev/videop0 ] && [ -h /dev/videop1 ] && [ -h /dev/videop2 ] && [ -h /dev/videop3 ] && break /bin/sleep 5s done /sbin/start mythtv-backend ==== (As you can see I have 4 tuners, and after reloading the module I have to wait for udev to recreate the persistent links to the tuners before restarting the Myth backend). I have found and am using the "IVTV audio fix" [1] in my channel change script; this does not prevent the problem. [1]: http://www.mythtv.org/pipermail/mythtv-users/2014-May/363737.html This problem does not happen very often. When it does I'm afraid I rapidly delete the recording in hopes of catching a rerun. So I currently don't have one to share. If it helps I will resist rapidly deleting the next occurrence. Version info: root@zotac:~# lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 12.04.4 LTS Release: 12.04 Codename: precise root@zotac:~# uname -a Linux zotac 3.11.0-23-generic #40~precise1-Ubuntu SMP Wed Jun 4 22:06:36 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux root@zotac:~# mythbackend --version Please attach all output as a file in bug reports. MythTV Version : v0.27.1-15-g050bf9d MythTV Branch : fixes/0.27 Network Protocol : 77 Library API : 0.27.20140520-1 QT Version : 4.8.1 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_crystalhd using_dvb using_firewire using_frontend using_hdhomerun using_ceton using_hdpvr using_ivtv using_joystick_menu using_libcec using_libcrypto using_libdns_sd using_libfftw3 using_libxml2 using_lirc using_mheg using_opengl using_opengl_video using_qtwebkit using_qtscript using_qtdbus using_sdl using_taglib using_v4l2 using_x11 using_xrandr using_xv using_profiletype using_bindings_perl using_bindings_python using_bindings_php using_mythtranscode using_opengl using_vaapi using_vdpau using_ffmpeg_threads using_mheg using_libass using_libxml2 Any hints would be greatly appreciated. Thx, Jan _______________________________________________ pvrusb2 mailing list [email protected] http://www.isely.net/cgi-bin/mailman/listinfo/pvrusb2
