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Question about lowering Latency
Rank: Newbie
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Joined: 8/8/2014(UTC)
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Hello Everyone
I would like to ask if anyone has any advice on how i can get the latency as low as possible.
I am using Vmix just to switch between a screen capture of my extended desktop and my webcam and am directing the output to website that uses flash.
I have what i consider to be a good laptop (i7 quad cor 12GB of ram) and i am still geting around 25-50ms delay which is alot when i record through a flash player. I can not delay the audio either as the audio output is not seen by flash.
Any and all suggestions welcome as money is not a concern.
Is there a certain but of hardware i should be focusing on if i was to build a PC for just this purpose?
Are there settings/features that i can turn off to lower the latecy?
Any general advice ?
Note that it is necessary to interface with flash in my situation.
Thankyou all in advance
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Rank: Advanced Member
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pls explain "audio output not seen by flash".
Where does the audio come from, and where should it go?
Can you tell the flash app where it should take audio?
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Rank: Newbie
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Joined: 8/8/2014(UTC)
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Thankyou for your reply. Essentially its website that uses flash to interface with the webcam. Mozilla firefox is the only page that will also recognize Vmix as an output (instead of the webcam) When i go to audio settings, only my PCs inputs are seen (Laptop mic, line in mic ) So the issue i am having is that because of the latency in Vmix , the webcam is not synced up with the audio so i am trying to minimize the latency as much as possible. Ideally i know that it would be better to send audio and video through Vmix but this is not possible through the website i am using. These are the things i cant control The way in which the website interfaces with the webcam/Vmix The Audio input into flash. I will take some screenshots of what I mean showing the Audio and video Input. I am seeking advice also on if I was to build a PC just for this purpose , what parts should I be focusing on AND how can I limit the latency in VMIX (what parts of the program can i essentially turn of to lower the latency) Again I appreciate any and all help Vmix inputs http://prntscr.com/4d1j3rAudio Inputs http://prntscr.com/4d1jdv
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Joined: 1/13/2010(UTC) Posts: 5,208  Location: Gold Coast, Australia Was thanked: 4288 time(s) in 1520 post(s)
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You can use Virtual Audio Cable, which is a cheap piece of software that provides a virtual sound card: http://software.muzychenko.net/eng/vac.htmYou can send the audio output in vMix to VAC and then select the VAC device in your flash streaming interface.
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Rank: Advanced Member
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Rank: Advanced Member
Groups: Registered
Joined: 2/18/2014(UTC)
Posts: 1,837
Location: Stockholm
Thanks: 144 times
Was thanked: 297 time(s) in 250 post(s)
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Virtual cables help you get the audio into the flash app. But you are then left with the audio sync issue. (BTW, I think you have more than 25-50 ms delay, which is hardly noticeable. 1 frame at 25p is 40 ms). If money is not a concern - think outside the (laptop) box ;) I have not tested this (can do later, but weekending away from all hw). You need - one decent laptop (eg yours or Asus G750-series, might be overkill) - one descent consumer camcorder with HDMI out (and maybe mic in, see below) - two XI100DUSB-HDMI- a mike (see below) Connect the camcorder to first Magwewell dongle, gives you Input camera 1 Connect the PC's HDMI out to second Magewell dongle, gives you Input camera 2 Perhaps you need to see a full screen image of what's on your extended desktop. If you have an extra video out on your laptop, select your Input camera 2 as source for Fullscreen. Or insert and HDMI splitter between PC HDMI out and Magewell in (might be tricky to get the right resolution). For audio you have a number of alternatives on how to use vMix's audio delay in order to fix sync. One way is to use built in/external mike and add it as an Audio input Input. If your camera has an audio input, you can connect your mike to the camera, and the audio will be on Input camera 1. In any case adjust your audio delay to get sync. Hope that this at least gave you some ideas.
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