Linux – Joining webm videos under Linux

FFmpeg will do this for you.

Your command might look something like this:

Code: ffmpeg -i input.mpg -ss 00:00:10 -t 00:00:30 out1.mpg -ss is the start point in hh:mm:ss from the beginning of your video file

-t is the length of time in hh:mm:ss of your new segment.

So, in the above example, you're starting 10 seconds in from the beginning of the original file and ending 30 seconds later.

If you want to create multiple parts in one pass then the following should work:

Code: ffmpeg -i input.mpg -ss 00:00:10 -t 00:00:30 out1.mpg -ss 00:00:35 -t 00:00:30 out2.mpg In this example, the first segment is the same as the first example, but you're also creating a second file starting at 35 seconds in and being 30 seconds long.

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Your problem may be caused because of differing frame rates in the source content. Use an application such as MediaInfo to determine whether this is the issue.

Suggestion #1

I've had success using AviSynth and VirtualDub for tasks like this. Avisynth creates a video stream based off of a script written by you. It's perfect for combining multiple small files because you're able to set precise timings. You may have to use one of the many 3rd party plugins to display successive .jpg images for set periods of time.

Once you are happy with what AviSynth is producing, use VirtualDub to encode it into whatever format you want.

Suggestion #2

Do your audio and video splicing seperately, and then merge the two streams as a final step.

1. Use an audio editor such as Audacity to create one master .mp3 or uncompressed .wav.
2. Create your slideshow video as you've been doing.
3. Combine the two streams. VirtualDub can do this, but it's a little cumbersome for something this simple. I've used ripbot264. The popular Handbrake tool could also probably do this.