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Audio out of sync with video
http://forum.linhes.org/viewtopic.php?f=6&t=6001		 Page 1 of 2
Author:  virusbcn [ Mon Sep 12, 2005 6:24 am ]
Post subject:  Audio out of sync with video
I ear the sound 3 or 4 seconds after the video, view the tv, i search but i don´t view any reference about this problem, i'm newbye on linux, i'm an IT of micro$oft, and i put three weeks installing and probing mythtv.
I have an old HP Workstation, P3 733 with 384 RDRAM, an 160 Gb HDD and one old card tv, miro pctv with 848 chipset, and SB Live 5.1.
Please any help ???

P.D.:
I think this is an issue of instalation, please if any think diferent, please tell me before delete it. Many times my posts are deleted
Author:  Xsecrets [ Mon Sep 12, 2005 7:10 am ]
Post subject: 
you need to run alsa mixer and mute the linein or micin wichever you have the sound inputing to and set it as the capture device.
Author:  virusbcn [ Mon Sep 12, 2005 11:19 am ]
Post subject: 
Thks, but I do that and it doesn´t work, i change my sound card and it doesn't work.
Its not possible for me save the audio of tv tuner, i hear the line-in but i don´t save, and i dont hear the not audio save. :cry: :cry: :cry:

Thks a lot for your speedy answer
Author:  mjl [ Mon Sep 12, 2005 8:20 pm ]
Post subject: 
Hi,

I think your issue is horse power. A 733 mhz and bttv makes for a lot of work. It should work great with a pvr-350 because I run a 600 mhz with that card and have no issues.

Mike
Author:  virusbcn [ Tue Sep 13, 2005 3:51 pm ]
Post subject: 
Please, what is your config of bttv, please ???
I think is a solution.

thks a lot !!
Author:  cesman [ Tue Sep 13, 2005 5:57 pm ]
Post subject: 
He doesn't run a bttv. This tuner card is a hardware MPEG2 card, it takes care of processing the video.
Author:  mjl [ Tue Sep 13, 2005 10:12 pm ]
Post subject: 
Hi cesman,

Quote:
miro pctv with 848 chipset


Isn't an 848 a Conexant BTTV chip? (I feel like I'm talking back to my teacher) :)

I haven't had much luck with the bttv family mainly do to lack of cpu speed that I have available.

Thanks
Mike
Author:  mjl [ Tue Sep 13, 2005 10:18 pm ]
Post subject: 
Hi virusbcn,

An after thought, does your audio play smooth and is just delayed from the picture?

Mike
Author:  virusbcn [ Wed Sep 14, 2005 2:42 am ]
Post subject: 
Sorry, i'm think i'm bad explained.
The audio i hear is the line-in, the problem its i don't save the audio tv and logically i don't hear after.
My old tv card PAL is and miro pctv, i have in card=1 and tuner=0.
I'm desperate !!!!
:cry: :cry: :oops:
Author:  tjc [ Wed Sep 14, 2005 6:35 pm ]
Post subject: 
- We need more hardware details including the exact type of TV capture card you have. Brand, Model Number, Chipset, ...

- If you are using a YUV type of card (aka a "frame grabber" or a "software encoding") you probably need a loopback jumper from the capture output of your TV card to the line-input of your sound card for recording the audio track. You also need to configure your sound card so that line-in is used as the recording source but is muted for output. However as someone else said the big problem is that your CPU is underpowered for this type of card.

- If you have some kind of card that captures an MPEG-2 encoded video stream (PVR, DVB, ...) the audio should alrready be part of the stream.
Author:  virusbcn [ Thu Sep 15, 2005 4:51 am ]
Post subject: 
It's ok.
I return to put a SB Live 5.1 and works ok, like not what I have done i've reinstalled knoppmyth to know and to make an idiot guide for newbies like me.
I've reinstalled 20 times in last month, i test debian, ubuntu and knoppmyth, one month searching in google, knoppmyth, etc... i'm crazy !!! ;-)
Author:  bettse [ Thu Sep 15, 2005 10:25 pm ]
Post subject: 
My name is Eric Betts and I appear to be having the same problem as the thread starter (video delay while watching live TV). I was doing the usual first move; searching the forums, and came upon this thread, which is recent and for the most part unsolved. I thought I could offer my own setup as an example and maybe help to resolve the threadstarters problem at the same time as my own.

I am somewhat confused by the threadstarters grammer, so I am not sure if his problem was resolved or how it was resolved. I did look into alsamixer and muteing linein/mic, but linein is used as the audio souce (a bttv card) and mic is already muted. I am a Linux desktop user, so I'm not afraid to muck around and I have a working knowledge that continue to grow. First of all, some System specs

[CPU] 1-AMD Athlon(tm) XP 2600+ @ 2114MHz (256 KB/0% load) ::
[Memory] 97M Used, 1009M Total (90% Free) ::
[Video] nVidia Corporation NV17 [GeForce4 MX 440] (/ Bit/) ::
[Disk] 1.61G Used, 12.57G Total (86% Free) ::
[Network] nVidia Corporation nForce2 Ethernet Controller (eth1: 0.82M In, 28.73M Out)
(information provided by yasis-2.8.pl)

lspci:
0000:00:00.0 Host bridge: nVidia Corporation nForce2 AGP (different version?) (rev a2)
0000:00:00.1 RAM memory: nVidia Corporation nForce2 Memory Controller 1 (rev a2)
0000:00:00.2 RAM memory: nVidia Corporation nForce2 Memory Controller 4 (rev a2)
0000:00:00.3 RAM memory: nVidia Corporation nForce2 Memory Controller 3 (rev a2)
0000:00:00.4 RAM memory: nVidia Corporation nForce2 Memory Controller 2 (rev a2)
0000:00:00.5 RAM memory: nVidia Corporation nForce2 Memory Controller 5 (rev a2)
0000:00:01.0 ISA bridge: nVidia Corporation nForce2 ISA Bridge (rev a3)
0000:00:01.1 SMBus: nVidia Corporation nForce2 SMBus (MCP) (rev a2)
0000:00:02.0 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
0000:00:02.1 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
0000:00:02.2 USB Controller: nVidia Corporation nForce2 USB Controller (rev a3)
0000:00:04.0 Ethernet controller: nVidia Corporation nForce2 Ethernet Controller (rev a1)
0000:00:05.0 Multimedia audio controller: nVidia Corporation nForce MultiMedia audio [Via VT82C686B] (rev a2)
0000:00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 Audio Controler (MCP) (rev a1)
0000:00:08.0 PCI bridge: nVidia Corporation nForce2 External PCI Bridge (rev a3)
0000:00:09.0 IDE interface: nVidia Corporation nForce2 IDE (rev a2)
0000:00:0d.0 FireWire (IEEE 1394): nVidia Corporation nForce2 FireWire (IEEE 1394) Controller (rev a3)
0000:00:1e.0 PCI bridge: nVidia Corporation nForce2 AGP (rev a2)
0000:01:07.0 Network controller: Intersil Corporation Prism 2.5 Wavelan chipset (rev 01)
0000:01:0a.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture (rev 11)
0000:01:0a.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev 11)
0000:02:00.0 VGA compatible controller: nVidia Corporation NV17 [GeForce4 MX 440] (rev a3)


Some things of note: the machine has a very small (13gb) hard drive, I haven't done any show recording, and if I do, I plan to sshfs mount my main machines hard drive to save the recodings to. If required, I have a 200gb harddrive I can install knoppmyth onto (i'd prefer not). The machine has a gig of ram, which should help compensate for some of its other shortcomings, and the TV tuner card is bttv based (i'm a cheap bastard)

I would now like to open up for any and all suggestions, if more information is required, just specifiy which file and I can reply with it.
Author:  cesman [ Thu Sep 15, 2005 11:01 pm ]
Post subject: 
Is DMA on the drive on?
Author:  bettse [ Thu Sep 15, 2005 11:02 pm ]
Post subject: 
# hdparm -d /dev/hda

/dev/hda:
using_dma = 1 (on)

Yup :)

~Eric
Author:  tjc [ Fri Sep 16, 2005 4:22 pm ]
Post subject: 
Muting in on output. Mute the line-in otherwise it'll pass through and the delayed video will have advanced audio. The was another problem folks were having with some newer SB cards but that's all the detail I remember, so I'll have to suggest a search for "audio out of sync" or "sound sync" (remember to check the "match all terms" box!)
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