Hot answers tagged

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 ...


4

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 ...


4

This sounds like a perfect candidate for using multi-camera editing. You can automagically synch all the clips using their audio, and turn them into a multicam source, which lets you edit from the multiple synched cameras quickly and easily. How to do it in premiere: Select your clips in the Project panel. Then, right-click the selected clips and choose ...


3

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 ...


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 ...


3

Short Answer Split your Video track into separate Events; Adjust the Events individually by dragging them along the timeline and stretching/expanding them; Overlap the adjacent Events so that there were no gaps; Long Answer I find one of the most valuable features of Sony Vegas its ability to split the original tracks into Events and adjust them ...


3

I've had my fair share of matching. C100 with 5D MK III, 5D MK III with 7D, 7D with C100, 7D with a Sony Camcorder. It's all a matter of getting two cameras that are similar in terms of resolution and how 'soft' the image is. For example, the C100 is incredibly sharp, like 4k sharp in 1080p, whereas the DSLRS I mentioned are quite soft. Although you can add ...


3

If the audio is primary and the visuals convey or complement the narration, then record the audio first. Use the audio timings to guide the pacing of your animations - if some demo takes longer than its oral exposition, the music should fill in there. But you can't really avoid the step where some sentences need individual adjustment or some animations need ...


2

I know this is a very old Q, but it should be pointed out that a 'negative timecode' makes no sense. The SMPTE frame before 00:00:00:00 is 23:59:59:29. The namespace for drop frame (and non-drop) codes is already well-defined -- no need to postulate negative values. If there are systems or programs that use this notation, they should be rethought.


2

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


2

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.


2

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

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

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

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

I am on Premiere CC 2015, which has its own PluralEyes equivalent for synchronizing audio under the "Merge" function. (I think it was also on CC 2014 but I am not sure what version originated audio sync functionality.) Select your two clips in your bin and merge them (it's under "Clip"). In the menu, under "Synchronize Point" choose "Audio" and make sure ...


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 ...


2

In addition to @Mulvya answer I will suggest to use not Flash, but After Effects for animation, if possible. Then you will be able to make Dynamic Link to your AE project. Than will be easier to jump between applications. But when you work with animation, you deferentially need to have voiceover first. Like in cartoon development.


2

Create a timeline from the master audio track, then drop the video clips one by one onto a matching video track using the native sound from those clips as a guide to line them up with the good audio. Then mute or delete the audio from the clips.


2

Premiere and FCP-X both have auto-sync features to get multiple audio and video clips synced together. Chances are very good that you can get your first video clip to align with the audio clip automatically. You might then be able to incrementally sync each additional clip with the audio clip, one at a time. I'm pretty sure neither program would do ...


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 ...


1

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 ...



Only top voted, non community-wiki answers of a minimum length are eligible