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Transmuxing is the process of changing the format of a video or audio file while preserving some or all of the streams from the original file.

Today, Zencoder can transmux H.264 video and AAC/MP3 audio tracks from MP4/MOV formats to MP4/TS (including creating fragmented MP4 or segmented TS output). There are, however, a number of requirements that must be met by the input files to transmux properly:


  • MP4/MOV container format
  • H.264 codec
  • No b-frames used


  • MP4/MOV container format
  • AAC or MP3 codec


  • Maximum GOP should be less than or equal to the segment duration
  • HE-AAC-V2 may not be used


  • Most encoding options have no effect on transmuxed files because the streams are not being re-encoded
Setting Default Description
copy_video false Copy the video track of the input file
copy_audio false Copy the audio track of the input file