how to understand recording file formats in Zoom

It is possible to save Zoom local recordings in MP4, M4A, M3U, TXT, CC.VTT, and VTT formats as well as cloud recordings.

Note: Versions 3.5 and higher of the MP4 recording application support making a single-resolution video with a fixed frame rate, with the goal of making media players happier. The versions prior to 3.5 were created from MP4 files that were multi-resolution with variable frame rates, creating an MP4 movie using multiple resolutions.

How to understand Zoom recording file formats

You will notice some of the following file formats listed on the web portal after you have located your local recordings and viewed your cloud recordings.

  • MP4: By default, video[random number].mp4 is the name of the audio/video file.
  • As an example: video98796876.mp4
  • M4A: By default, audio[random number].m4a is the name of the audio-only file.
  • An example would be audio98796876.m4a.
  • M3U: You can play all the individual MP4 files by using a playlist file (Windows only). The default playlist file name is playback[random number].m3u.
  • An example would be playback98796876.m3u.
  • TXT: In most cases, the default chat.txt file is used as a text file. Within this file, you can find saved chat messages during the meeting. In the case of a chat file that is saved locally, it will contain conversations that are sent to everyone and also conversations between participants.
  • CC.VTT: Closed caption text file that represents the recorded data from the cloud.
  • VTT: The transcription of the audio from the cloud recording is represented by the caption text file.

Recording separate audio tracks for each participant (only local recording will be done), the audio track associated with each participant should be named audio[Name][random number].m4a by default. AudioJohnSmith98796876.m4a, for instance, is a good example

Note : 
In order for screen sharing to take place, about 20MB of storage is required per hour, while recording video requires about 200MB per hour. As this is an approximate estimate, different resolutions and types of video or screen sharing content can have a significant impact on the amount of storage used.