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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 9 Jun 2020
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      At 1280x720 you do get all the pixels you paid for, though, but there is some kind of horizontal sharpening being applied. Again, compared against the LGP2.pic.twitter.com/NREwPMiR0o

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    2. Hector Martin‏ @marcan42 9 Jun 2020
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      (Right click and open those images at original resolution to get the proper idea; Twitter always scales by default)

      2 replies 0 retweets 10 likes
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    3. Hector Martin‏ @marcan42 9 Jun 2020
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      I would rate the artifacts at 720p as a bit worse than the LGP2, but not terrible (chinese left, LGP2 right). This is after adjusting the brightness/contrast/saturation/hue on both to attempt to match the original image (neither has good defaults).pic.twitter.com/sVYN4OVp5t

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    4. Hector Martin‏ @marcan42 9 Jun 2020
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      So I would call this a fairly capable 720p capture card overall, and only slightly lower performance at that resolution than devices that cost 10 times as much. At 1080p things are a bit messier, but it does work.

      3 replies 0 retweets 22 likes
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    5. Hector Martin‏ @marcan42 18 Jun 2020
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      So it turns out they report audio at 1ch 96kHz, but it's actually 2ch 48kHz. Currently testing a quirk patch for Linux, assuming it works as intended expect it in a stable series near you once it percolates through the pipeline.

      4 replies 0 retweets 16 likes
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    6. Hector Martin‏ @marcan42 18 Jun 2020
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      FWIW, interpreting 48k stereo as 96k mono (and downsampling to 48k, because you are, right?) is mathematically equivalent to a clean mono mixdown except one channel is delayed by 0.5 samples, which is negligible. So it's safe to use the card on Win/Mac and pretend it's mono.

      1 reply 1 retweet 17 likes
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    7. Hector Martin‏ @marcan42 18 Jun 2020
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      Basically for mono (center panned) content you'll get a slight high frequency rolloff (4dB or so at Nyquist = 24kHz), and hard panned content will sound fine with no distortion.

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    8. Hector Martin‏ @marcan42 18 Jun 2020
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      OMG. I think this is why they claim 96kHz mono. Assuming this isn't a bug in my USB config... these things have a hardware bug which briefly swaps the channels intermittently. Every second or so. So they probably set it to 96k mono as a hack so you won't notice!pic.twitter.com/XGnJ9OQogJ

      3 replies 3 retweets 37 likes
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    9. Hector Martin‏ @marcan42 18 Jun 2020
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      I have a suspicion as to what causes this and Linux might already have a quirk to deal with it. I think this happens when the USB transfer size is not a multiple of the number of channels.

      2 replies 1 retweet 18 likes
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    10. Hector Martin‏ @marcan42 18 Jun 2020
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      Yup, QUIRK_AUDIO_ALIGN_TRANSFER fixed it... and now the channels are just backwards. Lovely. At least it seems they're *consistently* backwards. Hopefully there's a way of quirking this in ALSA...

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      Hector Martin‏ @marcan42 20 Jun 2020
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      Patch for the kernel quirk sent to alsa-devel (cc stable).

      6:56 AM - 20 Jun 2020
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      4 replies 0 retweets 15 likes
        1. doragasu‏ @doragasu 20 Jun 2020
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          Replying to @marcan42

          I might buy one of these, so... thanks for the patch!

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        1. Manawyrm‏ @Manawyrm 20 Jun 2020
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          Replying to @marcan42

          Thanks for the patch! (mine from aliexpress should be here on Monday, so fingers crossed :D)

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        2. Hector Martin‏ @marcan42 20 Jun 2020
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          Replying to @OothecaPickle

          I don't think it's possible without writing a custom driver, unfortunately.

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          3. End of conversation
        1. Will Dormann‏ @wdormann 5 Aug 2020
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          Replying to @marcan42

          I noticed that with this patch there is actually stereo sound, which is great! However, in my testing in a VM, there are no /dev/video* devices unless I remove the sound card device. Sort of like what's mentioned here: https://bugs.archlinux.org/task/67460  Thoughts?

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