TS to MP4 Converter

MPEG transport streams (.ts, .mts, .m2ts) come from TV and set-top-box recordings, camcorders, OBS and streaming downloads, where a video arrives as many short .ts segments. Most phones, editors and upload forms want MP4. When the video inside is H.264 or HEVC — almost always the case for streams, OBS and AVCHD camcorders — this converter moves it into an MP4 unchanged, which takes seconds and loses nothing. Older MPEG-2 TV recordings are re-encoded to H.264 and can be deinterlaced. Segments of one stream can be joined into a single MP4. Everything runs in your browser with the ffmpeg engine (about 30 MB, downloaded once).

How to use this tool

1. Choose one or more .ts, .mts or .m2ts files.
2. For stream segments, choose "Join them into one MP4"; they are put in file-name order.
3. Keep "Fastest" unless the MP4 must be H.264 for an old device, and set deinterlacing for TV recordings.
4. Download the MP4.

Formula

Copy: MP4 = the same video and sound packets in a new container; AAC loses its ADTS headers

Transport streams wrap AAC sound in ADTS headers, which MP4 stores differently; ffmpeg converts them automatically while copying. AC-3, E-AC-3 and MP2 sound (common in TV recordings) is converted to AAC so the MP4 plays everywhere; every sound track and its language are kept. Segments whose timestamps continue each other are joined byte for byte; separate recordings are placed one after another, with the sound re-encoded so it stays in sync.

Example

A 45-minute OBS recording saved as an 800 MB H.264/AAC .ts file becomes an MP4 of about the same size in a few minutes at most (a 285 MB test file took under a minute), because nothing is re-encoded (the finished MP4 is held in the tab's memory, so files over about 1.5 GB, or 400 MB on a phone, may not fit). A 30-minute MPEG-2 TV recording at 720 × 576 is re-encoded at about 25 frames per second on a recent computer, so it takes roughly half an hour.