To join multiple MPEG (.mpeg, .mpg) files into one instantly and without quality loss, you must use lossless stream-copying tools that bypass the re-encoding process. Because traditional video editors (like Premiere or Filmora) force a full re-render of the video, they cause generational quality loss and take significant time to export.
By using “direct stream cloning” or “demuxing/remuxing” software, you can stitch matching files together at the exact speed of your hard drive. The absolute best, fastest tools for this task are outlined below. The Best Software for Lossless MPEG Joining How to MERGE or JOIN multiple videos without re-encoding
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