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Topic Title: Is there any way to delay video from USB camera?
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Created On: 3/18/2012 5:29 PM
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 3/18/2012 5:29 PM
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GRBNV

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Joined: 3/18/2012

I use a combination of USB camera and HD camera. HD camera is conndected via FireWire and video is delayed for about 1 second. I know there is no way to eliminate this delay, so the way to synchronize video from two cameras is to delay USB camera for the same amount of time. Have anybody tried to do this?
I'm not sure if it is technically possible, but I think it would be convenient to add video delay control to the software, similar to delay in the audio inspector.

 3/18/2012 7:21 PM
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sidimustafa

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you have two options..

1. WireCast Pro, which has a delay feature
2. Bherenger has a gadget that does audio delay (http://www.amazon.com/Behringe...5X&colid=416JD7FNHJY5)

Depending on what your are shooting, you can use the USB cam, for the active cam, where voice is needed, and the other Cam via FireWire, for non active voice shots (eg crowds) but all depending how your cams are position,

I was made to understand in previous postings, that the delay is caused by Firewire Connections.

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 3/18/2012 7:29 PM
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mmoon

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or...

3. Get a camera with uncompressed HDMI out so as to eliminate decoding the HDV compression.

All three will probably cost about the same...depending.

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 3/19/2012 3:50 AM
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mavik

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I understand this threat to delay the video and audio. So I suggest using a timeshift playout for the USB cam. One option would be using the VLC, let him play the video and pause for a second. This will timeshift the signal. Another option I know some sports guys do for instant replay is using a kind of video recorder with same functionality. But maybe if you route the USB-Cam to a video out and then back in you won't need any delay anymore.

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 3/19/2012 5:12 PM
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CraigS

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Wirecast Pro does audio delay (not video). The issue with HDV is the GOP based codec which takes time to decode, resulting in the video being later than the audio (hence the need to delay the audio).

mavik, Interesting suggestions on delay. Perhaps you can go into detail about any of them you've used specifically.

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CraigS
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 3/20/2012 4:03 PM
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midabrim

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I agree with this request! make a feature to delay the video this way if someone is using the cube, they can sync to a wired connection thru a capture card. since the cube is wireless there will always be a delay although if there was a video delay feature then you can also use a capture card for a second camera and have them still be syncronized due to the delay feature. (and u can gain quality)

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Teradek cube
 3/20/2012 4:26 PM
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CraigS

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Please do make the feature request. Fill out the form and link to this forum thread so the developers can follow.
http://www.telestream.net/tele...st/contact-support.htm

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CraigS
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 3/21/2012 7:24 AM
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mavik

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I just have validated the VLC approach. If you pause the video (USB CAM) and press play after 1 minute you have a timeshift of 1 minute.

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PE4L + AverMedia 727 (ExpressCard)
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AverMedia LGP (USB 2.0)
 3/21/2012 12:42 PM
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CraigS

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Hmm, maybe time to do a tutorial mavik?

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CraigS
Telestream Desktop Forum Moderator
 3/21/2012 1:14 PM
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mavik

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I don't think it requires a tut. Playing a live source and pausing it shouldn't be a problem at all. It's that simple. The pause button in VLC is big enough everybody should find it, lol. The question is more does it make sense. because now you have the delayed video in VLC and not in WC where your USB Cam would be originally. You need to run DTP, Xsplit or other to ingest that into WC. If that machine is encoding that maybe stresses the CPU which could be acceptable if it's your only choice. Otherwise I won't do it to not risk the live encode. Second if you record your session on disk it stresses the disk as well because VLC writes the video onto disk and has to play from disk for timeshifted playback.
I just said it's possible without any money. If it makes sense depends on the hardware and individual setup.

-------------------------
Dell E6530, I7-3720QM, 8GB Ram (Mobile)
I7-4790, ASUS Z87 Quad Deluxe, 16GB (Desktop)
Sintrones VDB-310 (mPCIe)
PE4L + AverMedia 727 (ExpressCard)
FFI VC400DE-SDI 4CH 3G-SDI equivilant to Magewell
Intensity Shuttle (USB3.0)
AverMedia LGP (USB 2.0)
 3/21/2012 1:35 PM
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CraigS

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Generally any delay would have to "buffer" to something such as disk or huge amount of held RAM.
Hitting pause not so accurate. I thought maybe you had found a way for an exact number of milliseconds delay.

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CraigS
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 3/21/2012 4:02 PM
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mavik

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no, sorry. no approach for that. maybe script VLC and set the delay in the script. Or a simple stop watch if it not has to be 100%.

-------------------------
Dell E6530, I7-3720QM, 8GB Ram (Mobile)
I7-4790, ASUS Z87 Quad Deluxe, 16GB (Desktop)
Sintrones VDB-310 (mPCIe)
PE4L + AverMedia 727 (ExpressCard)
FFI VC400DE-SDI 4CH 3G-SDI equivilant to Magewell
Intensity Shuttle (USB3.0)
AverMedia LGP (USB 2.0)
 3/21/2012 4:41 PM
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CraigS

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Do submit the request and see if our developers are interested in a more elegant solution.

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CraigS
Telestream Desktop Forum Moderator

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