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danluu's profile
Dan Luu
Dan Luu
Dan Luu
@danluu

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Dan Luu

@danluu

https://patreon.com/danluu 

danluu.com
Joined December 2008

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    1. Dan Luu‏ @danluu 31 Dec 2019
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      Replying to @danluu @davidcrawshaw and

      I suppose I could try to do a comparison by (for example) sending some known high-quality audio into the input and seeing what kind of quality I get out, if there's no difference between audio quality from a high-quality source vs. my laptop mic then I shouldn't expect much.

      2 replies 0 retweets 1 like
    2. apenwarr‏ @apenwarr Dec 31
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      Replying to @danluu @davidcrawshaw and

      My main concern with a USB camera is I expect tons of pointless latency, just due to the driver stack. People with professional cameras use them to film videos to watch later, so don't care about latency at all. I expect it to suck more than an Apple-optimized iPad+Facetime.

      1 reply 0 retweets 0 likes
    3. apenwarr‏ @apenwarr Dec 31
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      Replying to @apenwarr @danluu and

      I'd be surprised if the codec is a quality problem (except cellular codecs). But you can't make a high-SNR mic unless it has high selectivity. "Whole room" mics are the worst, by physics. One differential mic on each side of each speaker's face (airpods?) has huge potential.

      1 reply 0 retweets 1 like
    4. Dan Luu‏ @danluu Dec 31
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      Replying to @apenwarr @davidcrawshaw and

      I would've guessed that video latency is already so high that adding the driver stack in wouldn't make a huge difference, but that might not be true? I sometimes see the latency of calls directly (when someone recursively screen shares and a hall of mirrors slowly develops)

      1 reply 0 retweets 1 like
    5. Dan Luu‏ @danluu Dec 31
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      Replying to @danluu @apenwarr and

      It seems like I should be able to see the same thing and get the latency with the webcam in the loop with a single mirror, I should test that vs. an external camera to see if there's a noticeable difference

      1 reply 0 retweets 1 like
    6. Dan Luu‏ @danluu Dec 31
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      Replying to @danluu @apenwarr and

      I tried this and got 23-28 frames of latency (60fps) w/Macbook webcam & 6-13 w/external camera in hangouts. I only tried once (range is from "echos"), wouldn't trust this measurement without repeating it, but it's at least not 100x worse or something.

      1 reply 0 retweets 1 like
    7. Dan Luu‏ @danluu Dec 31
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      Replying to @danluu @apenwarr and

      Setup was 2 2017 13" Macbook Pros. Recorded using QT local recording. Macbooks pointed at each other, have something blocking the screen which is removed, latency is the time before that's seen, range comes from seeing this show up in progressively smaller windows.

      2 replies 0 retweets 0 likes
    8. Dan Luu‏ @danluu Dec 31
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      Replying to @danluu @apenwarr and

      Have symmetric gigabit internet connection, both machines connected through the same TP-Link Archer C7, local network idle other than this test (modulo interference from other networks).

      1 reply 0 retweets 1 like
    9. apenwarr‏ @apenwarr Dec 31
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      Replying to @danluu @davidcrawshaw and

      Gadzooks, half a second of latency with the internal webcam? That’s insane. Is that somehow normal?

      1 reply 0 retweets 0 likes
    10. Dan Luu‏ @danluu Dec 31
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      Replying to @apenwarr @davidcrawshaw and

      That's sort of double counting the latency (I think? Haven't really thought this through) since it's an entire round trip before you see the image updated. The change is so large I think it can't be 100% real and some of it is random variation, which I'd want to restest for.

      1 reply 0 retweets 0 likes
      Dan Luu‏ @danluu Dec 31
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      Replying to @danluu @apenwarr and

      The reason I think there's noise is the change should only impact one computer, so half the pipeline, but the latency is cut in half? There's no way adding the camera reduced the latency on one host to zero. Maybe I'm not thinking about this correctly, but this seems odd to me.

      7:36 PM - 31 Dec 2019
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Dan Luu‏ @danluu Dec 31
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          Replying to @danluu @apenwarr and

          I mean, if noise dominates the measurement, then it probably can't hurt too much to use an external camera, but I'd be curious what the average difference is and how much is just random noise.

          2 replies 0 retweets 0 likes
        3. Dan Luu‏ @danluu Jan 1
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          Replying to @danluu @apenwarr and

          Wait, it's not impossible that halving the latency is real, the image isn't round tripped through both cams and both displays. The entire pipeline should be: http://A.cam  -> A.mac.input -> http://A.to.B.network  -> B.mac.output -> B.display ->

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. Chris Hundt‏ @honestshrubber Jan 1
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          Replying to @danluu @apenwarr and

          You are measuring one cycle of this right? I don't think it needs a round trip and it looks to me like any part of it could dominatepic.twitter.com/Rql3aamI1T

          0 replies 0 retweets 0 likes
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