OBS defaults to MKV recordings because MKV survives crashes without corrupting the entire file. But when you need to upload to YouTube, TikTok, or share with a client, MKV isn't ideal — and if you have dozens of unconverted recordings sitting on your drive, doing them one by one takes hours.
This guide covers the fastest ways to bulk-export your own OBS recordings to mp4.
Why Does OBS Use MKV?
OBS uses MKV because it can recover the file even if recording is interrupted by a crash or power cut. An mp4 interrupted mid-write usually corrupts completely. For long live sessions, MKV is the safer choice.
For your post-recording workflow though, you need mp4. OBS has a built-in "Remux Recordings" feature that converts MKV → mp4 without re-encoding — near-instant and zero quality loss.
Bulk Export With OBS Remux (Recommended)
- Open OBS → File → Remux Recordings
- Drag multiple MKV files in at once (OBS supports batch input)
- Set an Output Path
- Click Remux — OBS converts to mp4 by switching the container only
Because it only changes the container (not the video data), conversion is almost instant. The output mp4 is identical quality to the MKV source.
Bulk Export With FFmpeg (For Larger Batches)
If you have hundreds of files, use FFmpeg's batch command:
for %f in (*.mkv) do ffmpeg -i "%f" -c copy "%~nf.mp4"
This converts every MKV in the folder to mp4 without re-encoding — same speed as OBS Remux but handles much larger batches.
Optimise OBS So You Don't Need to Remux
- Enable "Automatically remux to mp4": OBS Settings → Advanced → Recording — OBS remuxes automatically after every recording session
- Use a structured recording path:
D:OBS[Project][YYYY-MM-DD]— easy to batch process later - Use timestamp naming: OBS Settings → Output → Recording → Filename Formatting:
%CCYY-%MM-%DD_%hh-%mm-%ss_%s
After Exporting — Upload and Back Up
Once you have mp4 files, upload them through Klypio App. If you've already published clips and want to download them back as a second backup, use Klypio YouTube Downloader.
More on workflow: Organise Your Video Library and Choosing Bitrate and Codec for Creators.
Need unlimited downloads from any platform? Check Klypio Pro at /pricing.