![]() Is there a way to change the tempo of my audio file which preserves all 6 channels? How? But when I try to export to ac3 using the ffmpeg libraries, Audacity warns me that it will bounce the tracks down to 2 channels when performing the export. I can't find a way to separate those 6 channels into discrete files, perform the tempo change on each and then combine them again into a single ac3 file containing all 6 channels.Īudacity comes close, because I can use it to open the original ac3 file in separate tracks and change the tempo. The method I just described requires that I accept a stereo version mix-down of the audio when it is converted to wav, which is fine for most of the old video content I routinely convert, but now I have some stuff that's newer and I'd like to preserve the 6 channels through the tempo change process. I've devised a method to demux, convert my audio, a 6 channel (dolby 5.1) ac3 file, into a stereo wav file using a52dec, change the tempo using SoX (the most recent version of which is quite robust), convert back to ac3 with ffmpeg, then re-mux. OK, I want to increase the tempo of the audio file just enough that it correctly syncs with the video. The picture looks really good and the audio sync is close, just not quite close enough (for every 2 hours of video, the video component comes out about a second shorter than the audio).īefore proceeding, I thought I'd take a deep breath and say that I've done quite a bit of research on this, but so far I'm stumped. I have developed a method to use MEncoder to transcode some HD h.264 files to mpg. If you need more assistance, you can always send me your project through WeTransfer at. Make sure it’s simply set to “ON” and not “Bars” or “Beats”.Īssuming the tracks have been recorded in time, this should fix your problem and you can then proceed to add the remaining voices using your software instrument. The reason this might have happened is that you need to activate “flex & follow” for each audio track. If so, it seems like you’ve done the analysis using one of your audio tracks (which has changed the tempo of your project), but the other tracks haven’t followed. – the audio tracks you’re using as the foundation aren’t lining up correctly – you’re trying to add the remaining voices using a software instrument track (the virtual choir) – you’ve got 4 audio tracks for the male choir (Baritone, Bass, Tenor 1, Tenor 2) and 1 audio track for the piano The ear is unforgiving hence I would like to hear your opinion. She people seem to get this done in Final Cut but I believe the sound is more important and inconsistent lip sync on one of the 90 people is harder to find. I am just starting to learn how to use Logic Pro X and I am overwhelmed by the possibilities. You have a great way of explaining these points, I was able to do the analyses in a few minutes after I spent almost an evening trying to figure out how to use the beat and analyse function. If you have additional tips and tricks I would love to hear them. They need to be synced in their respective groups and then I need to get these 4 groups harmonized. ![]() I need almost to sync 90 voices in groups of Tenors 1 + 2, Bass and Baritone. For one obscure reason they almost end at the same time. I can easily get them started simultaneously, only they seem to get out of sync during the song. ![]() We started with 4 voices and the piano track. I am trying to synchronize voices of a virtual choir with Logic Pro X, because for obvious reasons we can not sing together.
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