vlc 1.1.8 audio distortions

[Snjezana]

Hello,

in vlc 1.1.8 audio distortions occurs every few (about 3 to 8 ) seconds, which is not the case with 1.1.7.

I'm streaming DVB-S over a LAN.
On the server side I have vlc 1.1.8 running with the command: vlc dvb.xspf --sout "#rtp{mux=ts,dst=[ff03::1]}"

When I start vlc 1.1.7 on the client side with the command vlc -vv rtp://@[ff03::1], I get the following piece of output:

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[0x87fe78c] main video output warning: vlc_object_find_name(postproc) is not safe! [0x873d99c] main input debug: Buffering 56% [0x873d99c] main input debug: Buffering 63% [0x873d99c] main input debug: Buffering 70% [0x873d99c] main input debug: Buffering 77% [0x873d99c] main input debug: Buffering 84% [0x873d99c] main input debug: Buffering 91% [0x873d99c] main input debug: Buffering 98% [0x873d99c] main input debug: Stream buffering done (1052 ms in 1050 ms) [0x873d99c] main input debug: Decoder buffering done in 0 ms [0x87dfdb4] pulse audio output debug: Pulse stream started [0x87dfdb4] main audio output warning: output date isn't PTS date, requesting resampling (224182) [0x87dfdb4] main audio output warning: audio drift is too big (224471), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (200471), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (176471), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (215188), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (191188), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (167188), dropping buffer [0x87dfdb4] main audio output warning: audio drift is too big (143188), dropping buffer [0x87dfdb4] main audio output warning: buffer is 119188 late, triggering upsampling [0x87dbb1c] freetype spu text debug: using fontsize: 36 [0x88393f4] main blend debug: looking for video blending module: 1 candidate [0x88393f4] blend blend debug: chroma: YUVA -> I420 [0x88393f4] main blend debug: using video blending module "blend" [0x88393f4] main blend debug: TIMER module_need() : 0.425 ms - Total 0.425 ms / 1 intvls (Avg 0.425 ms) [0x87dfdb4] main audio output debug: audio output is starving (20217), playing silence [0x87dfdb4] main audio output debug: audio output is starving (24749), playing silence [0x87dfdb4] main audio output debug: audio output is starving (23626), playing silence [0x87dfdb4] main audio output debug: audio output is starving (20334), playing silence [0x87dfdb4] main audio output debug: audio output is starving (20085), playing silence [0x877522c] main generic debug: auto hidding mouse

At the beginning of playing the stream, audible distortions occurs for about 1 or 2 seconds then the stream plays perfect and for hours no warning shows up.

With vlc 1.1.8 as client (on the same machine and OS) the output looks like that:

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[0x846a584] main video output warning: vlc_object_find_name(postproc) is not safe! [0x83d1e84] main input debug: Buffering 84% [0x83d1e84] main input debug: Buffering 91% [0x83d1e84] main input debug: Buffering 98% [0x83d1e84] main input debug: Stream buffering done (1052 ms in 1053 ms) [0x83d1e84] main input debug: Decoder buffering done in 0 ms [0x84049b4] pulse audio output debug: Pulse stream started [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (321004) [0x84049b4] main audio output warning: audio drift is too big (321004), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (297004), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (334697), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (310975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (286975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (262975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (238975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (214975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (190975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (166975), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (142975), dropping buffer [0x84049b4] main audio output warning: buffer is 118975 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (148131) [0x84049b4] main audio output warning: audio drift is too big (265964), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (241964), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (217964), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (193875), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (172798), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (148798), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (124798), dropping buffer [0x8405e5c] freetype spu text debug: using fontsize: 36 [0x85192d4] main blend debug: looking for video blending module: 1 candidate [0x85192d4] blend blend debug: chroma: YUVA -> I420 [0x85192d4] main blend debug: using video blending module "blend" [0x85192d4] main blend debug: TIMER module_need() : 4.531 ms - Total 4.531 ms / 1 intvls (Avg 4.531 ms) [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (55940) [0x84049b4] main audio output warning: audio drift is too big (156675), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (132675), dropping buffer [0x846a584] main video output warning: late picture skipped (15477 > -4620) [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (60417) [0x84049b4] main audio output warning: audio drift is too big (169467), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (144513), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (120513), dropping buffer [0x84162f4] main generic debug: auto hidding mouse [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (83152) [0x84049b4] main audio output warning: audio drift is too big (176978), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (152978), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (128978), dropping buffer [0x81daa3c] signals interface error: signal 17 overriden (0xb584c790) [0x81daa3c] signals interface error: /usr/lib/libQtCore.so.4(?)[(nil)] [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (128877) [0x84049b4] main audio output warning: audio drift is too big (236196), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (212196), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (188196), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (163844), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (139844), dropping buffer [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (60430) [0x84049b4] main audio output warning: audio drift is too big (175939), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (151939), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (127939), dropping buffer [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (62888) [0x84049b4] main audio output warning: audio drift is too big (164389), dropping buffer [0x84049b4] main audio output warning: audio drift is too big (141369), dropping buffer [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (-42547) [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (97170) [0x84049b4] main audio output warning: audio drift is too big (137617), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 9719835 usec (drift: -109347) [0x84049b4] main audio output warning: buffer is 109347 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98582) [0x84049b4] main audio output warning: audio drift is too big (135845), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 15552025 usec (drift: -73922) [0x84049b4] main audio output warning: buffer is 73922 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98811) [0x84049b4] main audio output warning: audio drift is too big (137041), dropping buffer [0x84049b4] main audio output warning: timing screwed, stopping resampling [0x84049b4] main audio output warning: buffer is 113041 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (97415) [0x84049b4] main audio output warning: audio drift is too big (137857), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 15696131 usec (drift: -73416) [0x84049b4] main audio output warning: buffer is 73416 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98374) [0x84049b4] main audio output warning: audio drift is too big (132900), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12576364 usec (drift: -73754) [0x84049b4] main audio output warning: buffer is 73754 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98342) [0x84049b4] main audio output warning: audio drift is too big (121542), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12673183 usec (drift: -73631) [0x84049b4] main audio output warning: buffer is 73631 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98379) [0x84049b4] main audio output warning: audio drift is too big (133769), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12671990 usec (drift: -73704) [0x84049b4] main audio output warning: buffer is 73704 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98513) [0x84049b4] main audio output warning: audio drift is too big (133750), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12671603 usec (drift: -74055) [0x84049b4] main audio output warning: buffer is 74055 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (97939) [0x84049b4] main audio output warning: audio drift is too big (134356), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12624053 usec (drift: -73612) [0x84049b4] main audio output warning: buffer is 73612 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98455) [0x84049b4] main audio output warning: audio drift is too big (133650), dropping buffer [0x84049b4] main audio output warning: resampling stopped after 12575193 usec (drift: -74137) [0x84049b4] main audio output warning: buffer is 74137 late, triggering upsampling [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (98458) [0x84049b4] main audio output warning: audio drift is too big (140140), dropping buffer [0x84049b4] main audio output warning: timing screwed, stopping resampling [0x84049b4] main audio output warning: buffer is 116140 late, triggering upsampling [0x846a584] main video output warning: late picture skipped (16417 > -10995) [0x84162f4] main generic debug: auto hidding mouse [0x84049b4] main audio output warning: output date isn't PTS date, requesting resampling (99178) [0x84049b4] main audio output warning: audio drift is too big (131433), dropping buffer [0x84162f4] main generic debug: auto hidding mouse

After the normal distortion at the beginning every few seconds there is a little audible distortion which is annoying.

I tried to play around with the settings: switching resampling off and on again, increasing the buffer times, using filters, but nothing helped.

Another thing:
What means the following message?

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[0x81daa3c] signals interface error: signal 17 overriden (0xb584c790) [0x81daa3c] signals interface error: /usr/lib/libQtCore.so.4(?)[(nil)]

I have it also on the server side with:

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[0x71d0e0] signals interface error: signal 17 overriden (0x7f5fcea10df0) [0x71d0e0] signals interface error: /usr/lib64/libQtCore.so.4(?)[(nil)]

But the server side works OK.

[Rémi Denis-Courmont]

Shutdown PulseAudio and retry.

[Snjezana]

Shutdown PulseAudio and retry.

I forgot to mention that this was the first thing I tried.
But neither restarting pulseaudio, nor reloading the audio driver with rcalsasound, nor reloading the sound modules via modprobe nor rebooting helped.
I also started powertop utility but there's nothing unusual to see when running vlc 1.1.8 instead of vlc 1.1.7 (roughly the same number of kernel wakeups for vlc and other running threads).

[Rémi Denis-Courmont]

Well if you're sure that it is a regression from 1.1.7 to 1.1.8, you always have the option of bissecting the source repository to pinpoint the faulty change. I have no ideas.