If you are a video editor, "601" usually refers to , the color standard for Standard Definition (SD) video. You might see this when converting old tapes or working with legacy DVD formats.
Use MediaInfo to see what is actually inside the file. Even if it says .mp4 , the internal video stream might be a rare format that needs a specific player. 601 mp4
If you are remuxing files using the OBS Remux Tool, select "Partial" color range to maintain the Rec. 601 levels. If you are a video editor, "601" usually
If you export a "601" video as a standard MP4, you might notice the blacks look "washed out" or gray. This happens because "601" uses Limited Range (16–235) while most computer screens expect Full Range (0–255). How to Export Correctively: Even if it says
Use VLC Media Player to open these, as it handles the varied codecs these devices often use better than standard Windows or Mac players.
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).