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5

Using one of these solutions will be more efficient. That's what you've asked for. It saves you time, because there's no more need to manually sync the presentation and the voiceover. Free Solution Keynote can record a running presentation with the mic-audio. QuickTime X has also a screenrecord-feature incl. audio. Low Cost Solution Specialized ...


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The professional way Professionally done, all cameras and audio recorders will have a running (SMPTE) time code, which can be configured in 'free run' mode - meaning the time counter runs regardless whether we record or not (ie, STOP mode). At the beginning of the shooting day, all recordists (cameras, audio) will sync their clocks. This is done either to ...


3

You are over thinking it. Edit a quick beep in before the audio starts on the song, play the song aloud while you are recording the drums. Hit one of your drums so that you can see and hear it quickly on the video as well. Record the audio direct from your drums and have a third track that is the microphone for the camera. The camera audio track will ...


3

You are looking for a Non-Linear Video Editing packages or NLE. Premiere and Final Cut Pro are two of the most popular, but they are also relatively pricy professional products. There are also many cheaper and/or free options available such as Windows Movie Maker (Windows) or iMovie (Mac). If you search for non-linear editing software or video editing ...


3

I have no idea if this is optimal for you, but one approach using free software would be to first determine the percentage (and direction) of drift by finding a point near the end where you can tell with some precision what the sync error is, in frames. Demux the video and audio into separate streams, using a free tool like AVI-Mux. Load the audio into ...


3

I tried kdenlive, so I'll post my findings about it as an answer. It didn't quite do the job, so I'm not going to mark this as the accepted solution. kdenlive easily imports my clips in mjpeg+pcm, and flac. And looks like it can export through ffmpeg, which is what I want. It has a feature to "set audio reference", and for other tracks, "align audio to ...


3

You could try processing the audio first to get it to the same speed as the video playback. Using (for example) Audacity you can apply a speed change of -0.1% (1000/1001) which is very likely the amount you're drifting by. You can change the rate without changing pitch, but if you can tolerate the very slight pitch shift you'll get slightly better results by ...


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Yes. The companies Spatz-Tech, HDFury and Faroudja have products with that functionality in their portfolio. But there are selling restrictions in many countries.


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There is no way to do this automatically. It has to be done manually by matching the frames together from the two videos. This can be done by placing the videos in separate overlay tracks and works for two or more videos.


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Regarding @rich's suggestion... if you don't have Quicktime, will iMovie work instead? Or some other program? Create your Keynote presentation. Record your speaking part (separately) with an audio recording program. I recommend Audacity. It's a great free application. You can download Audacity from www.sorceforge.com among other places. You'll also want to ...


2

It should be. You might end up with impedance mismatches that have to be dealt with, so it might take a few other (relatively cheap) steps to get there (devices called pads, which bring down the level), but it should work. The quality might not be quite as good though.


2

You can only sync video to an accuracy of a frame, or somewhere in the area of 15-40 mSec depending on frame rate. So as long as whatever you're shooting can update and refresh at least that quickly, it's not important to do much better. Even shooting a mechanical metronome will probably get you as close as anything else. The refresh rate of the display ...


2

I probably could have done a quick google search before asking. HERO3+ Black Edition may be the only currently selling supported unit, but I found that following historical products are compatible with a "3D HERO System" (which may be different from "Dual HERO System"): HD HERO Original camera HD HERO2 camera Dont know whether "3D HERO System" has ...


2

You probably will not achieve a 100% perfect result with your setup. That you got them synced to a 1FPS accuracy is pretty amazing actually. Professional stereo setups use frame locking in hardware to ensure the cameras record in perfect sync. This is not possible with ordinary webcams. If you fix the recorded video in post you can get to less than ...


2

Haha! In movies about movies you always see this clap in the beginning of a shot. The one where the take number and everything is written on with chalk. And they hold it in front of the cam and make one loud clapping noise with it. Well, if you have ever wondered what this ritual is for, congrats! You have found the problem to the solution ;-)) You get a ...


2

Try Blender's Video Editing. If Video and audio where recorded at the same time it will be easy to sync them, just be sure your video frame rate is correctly set in Blender and that you check synced in the video editor (at the bottom beside the time line and play, stop, etc... buttons. Don't be scared by Blender's complexity, you are not going to use any ...


2

You can link multiple clips as you would link two clips. First, put all the audio and video tracks you want in your timeline and arrange them using the timecodes, manual adjustments or however you prefer to align the individual recordings (I'm assuming you have a method for that, since you removed that part of the question in the last edit). Then select all ...


1

In the question sync separate audio to video+bad-camera-audio, free NLE recommendations I detailed how I manually did A/V sync for audio recorded separately from the video, with audacity and ffmpeg. 44.1kHz vs 48kHz has nothing to do with the drift. The problem is that the camera's clock isn't exactly the same speed as the laptop's clock, so even though ...


1

Interesting that LW shows it as '24 fps' since audio technically doesn't have a frame rate, which is a video concept. As @tomh suggests, make sure the sample rates for the project is 48K, and that you export a 48K WAV file from Audacity. If that doesn't cure, you can use Audacity to 'pre-stretch' the audio by some percentage. Find sync points near the ...


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Make sure the sample rates in both systems are the same. I don't know what OBS is, but if I was using Final Cut for video editing, I would make my project 48kHz, and make sure any external recordings were also at 48kHz. Even with the same sample rates, audio will drift over periods of more than a few minutes. Either sync it up manually in chunks, or use ...


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You can tell which one gets out of synch like this: Set up your camera and your phone like you usually do. Put a clock that shows seconds right in front of the camera. Then, even though this sounds boring, record yourself counting off the seconds. Synchronize the video and audio in Premiere Pro like you usually do. When they get out of synch, check whether ...


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There are any number of possibilities, but the most likely ones all involve getting better equipment. The most severe sync problems with phones tend to come from phones that use variable framerate video or tend to have cheap encoders that tend to drop or delay frames. When you are recording video, each frame has to be recorded more or less in real time. ...


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The most common cause of this kind of asymmetric drift is dropped frames. With older equipment, there were sometimes inconsistencies in the internal clocks that would result in issues that time didn't flow at a consistent rate between samples, but most decent modern hardware, while it may have slightly different rates, is inherently stable at that rate. ...


1

A clapper is the easy approach for your budget since it will provide a synced audio/video event that can be heard on the audio and seen on the video. The main problem you might run in to however is that many cellphone video cameras are not fixed frame rate. If they do not capture with a reliable and accurate timecode then syncing up after the fact will ...


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I have a similar problem and that's how I found your question online today... The Mp4 file from my nx1000 was imported as it is on adobe premiere cs3. The audio and video seem to have same starting and ending point, but the video alone is faster than the original as if it was stretched, and the audio has the normal speed but ends in the middle of the ...


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There is a plugin called vocalign that will do this. It is designed mainly for aligning vocal overdub and replacment dialog but it should work for what you are doing. You can use it as a VST in audacity. It isn't cheap but, if my memory serves me correct, it has a fully functioning demo. http://www.synchroarts.com/index.php?PAGEID=products&ID=vocalign


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I have two screen set up and I record everything live using a blue yeti and the record feature in key note..i use the "show presenter note" to write the script for the various slides using RED to signify when to click on the advance arrow to trigger an animation - text replace .. etc.. with two screens keynote shows a "live" view and a "preview" view with ...


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As @DoktorHauser mentioned. Using one of the tools he mentioned would actually solve your problem. I don't really understand why you recorded your voice separately, if the point was to bring the video together with the audio. In that case it would have been much easier to record the audio with the video. (ScreenFlow, Camtasia and any of the tools mentioned ...



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