The output video is almost always garbled in some way. Looks like WebM doesn't like to be used like this! Then attach this new audio track to the main video, and save it as a new one: ffmpeg -i video.webm -i concat_audio.webm -c copy video_final.webm Take the main video and the small audio files recorded on the way, and concatenate them into a new audio track: ffmpeg -f concat -i concatenate.txt -vn -ac 2 concat_audio.webm Now call ffmpeg to put together a new video. Here's an example:įile vhP9u_NDj0nEPS6EAtmCf.webm <- yes, that's a random filename Using the saved timestamps, assemble an ffmpeg concatlist.After the user finishes recording the presentation, save the "main video".When the user hides the video, save the timestamp again, and save the separate audio recording.(No, I can't take it from the original file, because the user may pause it, seek into it, stop it prematurely, etc.) When the user shows a video clip, mark the timestamp, and record the clip's audio stream with a second MediaRecorder instance.The solution I came up with is the following: I can't turn off the mic and switch to a new audio stream, and then back, or the API shuts down the recorder. There are a few other codecs, but they all unreliable and often crash.Īt this point I can record video from the camera, and there's no problem with superimposing short video clips over the camera image, but I can't record the audio of these files. MediaRecorder only seems to save into WebM with H.256 encoding and Opus audio. So I had to come up with a workaround, or the user can only show videos without sound. If you attempt to replace the current audio stream with another, recording immediately stops. Most importantly, you can't change streams while recording. As the name implies, this can be used to record the contents of a stream, both video and audio. The JavaScript Media and Streaming API has a feature called MediaRecorder.
When recording ends, the presentation is all saved into a WebM file. These assets can be superimposed over the video any time. The user can talk into the camera, and show pictures, videos, or play audio files. I'm developing a video recorder application in JavaScript/Electron.
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