Correcting audio/video sync in videos recorded with Streamsie

Correcting audio/video sync in videos recorded with Streamsie

Streamsie records videos in H.264 format, which is a highly compressed format created to be able to be delivered over broadband networks efficiently. Because of this compression, videos recorded with Streamsie cannot easily be edited with non-linear editing software such as Adobe Premiere, Apple Final Cut Pro, Sony Vegas or other editing software. Even when these editors are able to read and play back the H.264 video file, editing on a frame-by-frame basis is problematic to impossible. In order to edit the video with these types of software, the file must first be transcoded into another format. Which format is best to transcode to depends on what editing software you are using. Check your software for the source file types that are supported before you choose how to convert your video file.

It is important to note that converting your H.264 video file will likely reduce the quality of the video. Once you are done editing the file, you will then need to re-encode the video back into H.264 format for streaming on the web and to mobile and other devices. This will result in further quality loss. In order to combat this, it is important that the original video file is encoded at the highest quality possible so that each conversion will still result in as good a quality video as possible.

If all you want to do is to some basic simple editing of your H.264 video file, there are free tools available online that can solve this problem without needing to convert the file or re-encode it. One such free tool is called Avidemux and is available from Sourceforge here: avidemux.sourceforge.net/. With this too, it is possible to simply trim the start or end of the video or stitch two video files together (although to do this it is important that the two videos are encoded with exactly the same settings). Here is a step-by-step explanation of how to trim the ends of an H.264 video file using Avidemux:
  1. Open the file in Avidemux and make sure that the Video Output and Audio Output settings are set to "Copy" and the Output Format setting is set to MP4v2 Muxer.
  2. Open the video you want to fix from the File menu.
  3. Find the Audio Output setting and check the box that says "Shift".
  4. Enter the number of milliseconds that you would like to shift the audio. Use negative numbers if the audio is ahead of the video and positive numbers if it is behind the video. 
  5. Click save to save the video with a new filename (do not overwrite the original file).
  6. Check the result by watching the newly saved video file to see if it is now in sync. If not, repeat steps 4 and 5 until you are happy with the results. You can continue to work with the original file in avidemux until you are satisfied with it and simply overwrite the newly created video file each time you try a new Shift setting.

NOTE: This will only work to correct videos that are out of sync the same amount all the way from beginning to end. If the audio/video sync is "drifting" and getting worse over time, this solution will not repair that problem.

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