DVL-Digest 1508 - Postings: Index Capturing 4 Audio Channels at Once? Sony Camcorder Audio Sample Rate Wrong ? Capturing 4 Audio Channels at Once? - Mitchell Gass The Sony DSR50 portable DVCAM VTR has four audio inputs. Are there NLEs that can capture four separate 32KHz audio channels at the same time? It appears that Final Cut Pro can capture the first two audio channels, the second two channels, or mix the channels to stereo, but not capture all four channels at once. Mitchell Gass uLab | PDA: Learning from Users | Designing with Users Berkeley, CA 94707 USA +1 510 525-6864 voice +1 510 525-4246 fax http://www.participatorydesign.com/ Sony Camcorder Audio Sample Rate Wrong ? - "Perry Mitchell" From: Matt Garretson I've been capturing a bunch of Hi8 tapes by doing a firewire transfer from a Sony TRV730 Digital8 camcorder to an ADS Pyro 1394 card (WinXP). On all my captures, I was having persistent audio sync problems with the AVI files created by the capture app (Scenalyzer, Premiere, AVI_IO). By the end of the AVI, the audio would be about half a second ahead of the video. After *much* frustration in trying to figure out why this was happening, i just gave up, and now whenever i do A/D converision with the camcorder, i always stretch the resulting audio track by a factor of about 1.00005, which pretty much gets everything back into sync. So i'm just wondering if anyone knows what is going on here? It almost seems that the camcorder is sampling the analog audio at the wrong rate (by my calculation, about 47997.7 Hz) but still transferring it at 48KHz over the firewire so that the capture apps don't notice a problem. Is that even remotely possible? Does the DV spec require a fixed number of audio samples per frame, or can the number vary from frame to frame? Has anyone else seen or heard anything like this? (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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