If you are remuxing files using the OBS Remux Tool, select "Partial" color range to maintain the Rec. 601 levels.
In tools like Adobe Premiere Pro or DaVinci Resolve , ensure your "Color Space" is set to Rec. 601 for SD timelines. 601 mp4
Many dashcams and NVRs (Network Video Recorders) label files numerically. If you have a file named 601.mp4 , it is often the first file in a 600-series folder or the 601st minute of recording. If you are remuxing files using the OBS
If you are using downloader scripts like yt-dlp , ensure you are on the latest version, as bugs often cause "unable to download" errors for long videos (common in 600+ MB files). 601 for SD timelines
Sometimes files are corrupted during transfer. Try the FixVideo Online Tool or Restore.Media if the file was from a camera that cut out.
Are you trying to a video with specific color settings, or are you trying to repair/open a file that has "601" in the name?