Your dashcam saved everything as .TS files and now nothing will play them. Converting dashcam TS to MP4 here is an instant rewrap with no re-encode, so every frame stays bit-identical and the MP4 saves straight to your Downloads folder. No upload, no file cap, no signup.
Why dashcams use .TS at all
Transport Stream is crash-tolerant: if power cuts mid-write (say, during the exact accident you bought the camera for), the file up to that moment stays playable. Smart engineering, until you need to send the clip to an insurer, a lawyer, or a family group chat. The MP4 rewrap keeps every frame and quality bit identical; only the container changes.
FAQ
Is any quality lost?
None. This is a container swap, not a re-encode. Bit-identical video, new envelope.
The file "won't play at all," is it corrupt?
Try the rewrap first. Many "corrupt" dashcam files are just fine inside the unfamiliar container. Truly truncated files may still convert up to the cut; deeper repair tools are on the workbench.
Big files?
Multi-GB clips work best on a computer in Chrome. Nothing uploads either way.