![]() ![]() It's magnitudes more accurate! But not perfect. A sample rate clock works just like a tape deck motor. It's because the sample rate clock in the camera's audio system is slightly a different speed than the sample rate clock in the audio interface used for the mic. Any ideas on what am I doing wrong? Thanks. I get it synced up fine at the beginning but by the the end it's off. I get the audio recorded in Reaper from a microphone and the same thing recorded on the camera's mic. They're quite clear in the WAV form as it's percussion. I record a session with the camera capturing the acoustic sounds. By the way, I tried rendering the UMC404 audio to 48,32 bit instead of 44.1, 16bit but somehow it made the track twice as long? Cheers. ![]() There's supposed to be one in a video program I have, Cyberlink Power Director, but it hasn't worked for this kind of work for me and it's a nightmare to try to manually sync it there. I have to say that would be a great feature for people that know how to do the coding in Reaper to have a sync function. I'm going to try looking at the drift discussion. I always start with a clear count in like 4 hits on a rimshot and then can line the 2 mics up but when the sync is off in the middle it's a double click where there should only be one and it just gets the video off enough to see something is slightly wrong. I had the beginning in sync and now the last few minutes are OK but the middle (most of it) is still out. It got the last few minutes of the segment in sync. ĮDIT: Did some quick lazy research on YT and found this video and apparently the internal clock not keeping good time is the most common issue: The drift not being constant seems very peculiar to me - as if the internal clock of at least one of the recording devices is not working properly. If the drift is constant, it will even be sufficient to ALT-left-drag the right edge of the video item to get it in sync with the audio from start to finish.Ĭould you maybe recommend any online resources where I could read more about this drift? It seems you know what you're talking about but I'm not sure I get it completely so maybe a dedicated article could help elucidate it. The stretch marker method works well once you get used to it. There are apps that automatically allign audio and video but doing it manually in Reaper is no big deal. If it drifts apart in Reaper it will do so in any other software. You can drop whatever media file into Reaper and it will play correctly unless you have some import option messed up. I used to do the same thing, although not with the UMC404, over longer periods of time and I didn't notice it get so out of sync.I'm going to have to study up on what stretch markers are.Thanks. Still confused as to how quickly it gets out of sync. It's just a simple Sony Action Cam AS200 and a Behringher UMC404HD. I just checked item properties and all are set to 1.0. I've done that multiple times with perfect results. You probably won't notice the slight changes in the video's speed. What you can try is sync'ing the beginning of the two items and then insert stretch markers into the video along the way to keep the video in sync with the audio. Unless your camera is fairly pro-grade, it probably won't dispose of such an option, though. Reaper can be transport-sync'ed to incoming timecode (SMPTE/LTC/MTC). If so, you could use that next time to sync the two machines already during recording. Maybe your camera has an SMPTE or LTC sync input or output. You have to establish some kind of synch'ing mechanism prior to start the recording on too different devices to get the two recordings in sync from start to finish. If the drift is still there, that will be a normal thing. If they are not, put the playrate to 1.0 and see if the alignment changes. Make sure that when you double-click on each item to open its item properties they are both set to a playrate of 1.0. What you are seeing is just the expected drift of two recordings that have been made on two different, non-synchronized devices. The length of a 44.1k recording should be exactly the same as the video's audio at 48k. ![]() I don't think that the issue is caused by sample rate mismatch since Reaper will resample content on the fly, normally without changing the length of the content. ![]()
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