Convert MPEG transport stream files to MP4 so recordings from set-top boxes, PVRs and AVCHD camcorders open in ordinary players and editors. The video and audio are normally copied across without re-encoding. Everything happens in your browser, so nothing is uploaded and no account is needed.
or click to select a file
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Drag a .ts or .mts file onto the upload area or click Select Video. Long recordings are fine - nothing is sent to a server.
MP4 is selected automatically. Click Convert - the streams are repackaged rather than re-encoded wherever possible. Download the MP4 when done.
A transport stream is built for broadcasting, not for storage. The format chops audio and video into small fixed-size packets so that a receiver can tune in halfway through and still start decoding, which is exactly what you want over the air and exactly what you do not want on a hard drive. That design is why .ts files turn up from digital TV recorders, satellite boxes, AVCHD camcorders and HLS video downloads.
The cost of that robustness is overhead and awkwardness. Transport streams carry packet headers throughout the file, so they are larger than they need to be, and they have no clean index of where anything is. Players that do open them often seek badly, and plenty of editors and upload forms will not accept the extension at all.
MP4 fixes both problems. It stores the same compressed video and audio with far less packaging around it and adds a proper index, so seeking is instant and the file is usually smaller despite being identical in quality. Most TS recordings already contain H.264 or HEVC video, so the conversion is a straight copy into the new container with no re-encode and no quality loss.
Broadcast recordings sometimes carry audio codecs that need converting on the way, such as AC-3 or MP2, in which case the audio is re-encoded while the video is still copied untouched. Either way it all runs locally in your browser, with no upload, no size cap beyond your device's memory, and no watermark.
The video is copied without re-encoding, so the picture is identical to the recording. Audio is also copied when the MP4 container supports it; broadcast formats such as AC-3 or MP2 are re-encoded to AAC, which is the only step where any quality is affected.
Transport streams wrap everything in small packets with repeated headers so a receiver can join a broadcast mid-stream. MP4 does not need that, so the same video and audio take up less space once the packaging is removed.
Yes. AVCHD camcorders write the same MPEG transport stream format under those extensions, and they are handled the same way as .ts recordings.
There is no hard limit. Because nothing is uploaded, the only practical ceiling is your device's available memory. Multi-hour recordings are usually fine on a desktop computer.