View Full Version : Choppy mp3 audio
13-01-2010, 02:46 PM
It happens sometimes, no matter the channel, the signal strength, the mpeg1 decoder, the OS (xp and 7), the Wintv version (6 and 7). I need to stop the stream and then click on LIVE TV, but sometimes I need to close the App too.
It has been happening since beginning and it's quite annoying (especially for viewers next to me, who usually watch the tv elsewhere and tell: "I don't like those pops"), I was simply too lazy to remember to drop a line here.
13-01-2010, 03:45 PM
I dont understand. Are you playing .mp3 files in WinTV? There is no mp3 audio in broadcast tv.
13-01-2010, 03:46 PM
Err... my bad, mpeg1 audio, not mp3.
13-01-2010, 05:17 PM
If you record and playback that recording, does it show the same problem?
13-01-2010, 05:37 PM
It doesn't seem so.
13-01-2010, 05:53 PM
You could try increasing the <LiveSwitchDelay> setting in settings.xml. Maybe try setting it to 1000.
13-01-2010, 05:57 PM
Is it the delay with the real time stream in ms?
I've done it, I'll let you know its behaviour in the next hours.
13-01-2010, 05:59 PM
Nope, nothing changed.
13-01-2010, 06:02 PM
I'm not really sure them.
13-01-2010, 06:17 PM
Here's a sample (I recorded it trough line in, AS IS).
Of course it's a foreign language and sounds a bit confusing, but if you listen carefully, you can find those issues. Sometimes they are even worse.
14-01-2010, 05:29 PM
Here's a fresh line-in sample, but this time in lossless format, 'cause I was afraid that mp3 compression could "eat" something.
14-01-2010, 06:01 PM
Sorry, I dont know. Its not a problem I've come across. Maybe try other audio decoders.
14-01-2010, 06:03 PM
That's the weird thing: as I wrote, it doesn't depend on the chosen audio decoder :(
14-01-2010, 06:09 PM
Sorry, I dont know then.
14-01-2010, 06:37 PM
I also live in Napoli and I use WinTv 7 all days, but I don't have any audio problems!:confused:
14-01-2010, 07:15 PM
The problem was present in Wintv6, too.
14-01-2010, 07:25 PM
WinTV6 is entirely unrelated to WinTV7 (no shared code), but I guess the observation does at least tell us its happening in multiple apps.
Maybe its something to do with the sound system drivers on your machine?
14-01-2010, 07:27 PM
That wouldn't explain why the recorded .ts works well.
It's really, really strange.
16-02-2010, 05:28 PM
What if it is a hardware issue? Could it be?
The issue seems to cross OS'es (xp 32bit and 7 x64), WinTv versions' (6 and 7) and audio decoders (MCP, ffdshow).
21-09-2010, 08:53 PM
I'm still waiting for a solution (7 months are a reasonable time:)).
Furthermore, with the newer 2.x version, it stutters even more when the screen is black and there are only some phrases or a small picture (ie. at the end of a movie or between two ads).
21-09-2010, 09:21 PM
I'm still waiting for a solution (7 months are a reasonable time:)).To be honest, I dont think anyone is even looking into it (it'd be me if anyone). I was never able to reproduce it.
In the settings screen, if you disable all the audio decoders other than the MPEG1LayerII audio decoder, does it help?
21-09-2010, 09:25 PM
that's sad. What should I do? It's really annoying 'cause I chose to dump the old CRT tv and watch the TV on the computer only, so I haven't much alternatives.
21-09-2010, 09:29 PM
that's sad. What should I do? To be honest, I dont know what will fix your problem. Its hard to guess without being able to see the issue myself. Did you try my suggestion above?
21-09-2010, 09:32 PM
Disabling all the other audio codecs?
I've just disabled AC3 codec (the other two being already disabled) and will let you know.
21-09-2010, 09:36 PM
Yes, that's what I meant.
21-09-2010, 09:39 PM
Random thoughts in the meanwhile...
Does the fact that with version 2.x it stutters even more if the screen goes dark, like at the end of a movie or between two ads, mean anything?
Does the mpeg video codec provide HW acceleration and maybe the device has some hardware issue and can't accelerate the stream flawlessy?
Did you try TheNewGuy's suggestion?
Can you confirm that playing back a recorded TS file does NOT have the issue?
22-09-2010, 09:22 AM
As I wrote, I'll post any updates here. The issue doesn't begin whenever you open WinTV, but after a while (it may be 10min, it may be 1 hour...). That's why I tought that there may be some HW decoding problem (maybe related to overheating. The usb stick IMHO is really hot, even if it's surrounded my fresh air).
Yes, as I wrote I can confirm that .ts files don't have the issue. It's a realtime matter.
27-09-2010, 05:26 PM
UPDATE: It SEEMS that disabling any other codec but MP3 (AC3 was the only one enabled) did the trick, but I want to investigate on it in the next days.
However, I can't find myself any explaination for this, because AC3 streams are transmitted on HD channels only, and the issue was present on SD channels only... maybe a bug?
Thanks for now.
22-10-2010, 03:33 PM
After 3 weeks, I can definitely say that the problem occurs when AC3 or AAC audio codecs are selected (even if the stream DOESN'T CONTAIN ac3 or aac audio at all!).
The reason seems to be unknown.
yes I see this too, we'll look into it.
31-10-2010, 11:20 AM
FYI I have exactly the same problem.
31-10-2010, 11:27 AM
It has been a nightmare since 1 year.
I finally got rid of it.
06-11-2010, 10:20 PM
I have the same problem with choppy audio in WinTV 7 2.2b CD.
It happens randomly.
If i restart WinTV - sometimes it helps and sometimes not.
If it happens and i switch to other channel - choppy audio goes away, if i return back i get choppy audio again.
Sometimes all channels works fine.
I really don't get this.
With ArcSoft Total media 3.5 this TV tuner works fine. No choppy audio at all.
DVB-T, Hauppauge 3000 HVR, Win7 64bit.
*this problem is reproducable only with DVB-T.
*ofcourse if try to record something into TS format - it plays ok.
08-11-2010, 10:30 AM
UPDATE: I disabled AC3, HE-AAC, DD+/EAC3 audio.
Audio is not choppy anymore.
great, I understand the cause of the issue now, we'll look into fixing.
you could also for a test try re-enabling the audio decoders and editing Settings.xml change
<ForceClock>Default DirectSound Device</ForceClock>
<ForceClock>Default DirectSound Device 0002</ForceClock>
See if this fixes for you
08-11-2010, 11:00 AM
15-11-2010, 02:29 PM
this mod seems to have worked for me, so far anyway.
excellent - hopefully we should have this fixed automatically soon.
26-02-2011, 09:08 PM
I forgot to write that the
<ForceClock>Default DirectSound Device 0002</ForceClock>
mod didn't work here, so I can't watch HD (ac3 audio) channels.
Any good news on this issue?
it's something we'll address in the next main release.
27-02-2011, 09:28 AM
09-05-2011, 05:14 PM
I enabled ac3 audio (ffdshow), and I can still hear some pops on SD channels (mpeg audio).
However now the bug happend after 1 hour (while I'm writing it's slowly getting worse) since I opened WinTV, so it seems that the latest release changed something and caused the bug to occur later (but in a worse way, because there are way more pops and clicks than before).
This is now fixed in CD 2.4b up next week.
22-09-2011, 09:19 AM
Glad to hear it, thanks :)
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