How to fix incorrect MP4 file-length property?

Report · Jul 21, 2023

Running Windows 11 on Victus laptop w/AMD Ryzen 5000 series 7 & Radeon gfx.

Latest versions of Permier Pro Desktop and Media Encoder installed and updated.

I have about 39-44 minutes of MP4 footage that was originally captured on a Sony 4k camcorder. However (and I caused this probelm) when I renamed the file and moved it via USB, Windows changed the file properties associated with the video. (I never have any problems when I import or ingest directly from the SD card.)

All the video is still there - the file size is the same, etc, etc. But now Windows, Premier Pro and Media Encoder all think it's only 3 seconds long. The resulting mp4 only plays the LAST 3 sec of the original. There's probably a Sony or Windows hack out there somewhere to fix this, but I'd much rather fix my self-inflicted idiocy in Premier Pro or Media Encoder.

The original stuff is gone now. The SD card has since been formatted. Can anyone offer a solution?

Report · Jul 24, 2023

Did you try AME to convert the file?

If that does not work: install ffmpeg and try ffmpeg -i input.mp4 -c copy output.mp4. This command copies the input stream. At least worth a try.

Report · Jul 24, 2023

Thanks for your prompt & professional reply.

I haven't tried anything yet. Past experience tells me that checking with the support community before compounding the problem is always the best option.

I will give these suggestions a shot and post the results.