UE 5.4 Media Player not looping for specific file

[JustJunuh]

Hello, I need help finding the right encoding settings for my video. I can get it to play. However, it will not loop. When I try targeting a different media file, it will play and loop.

Attached below is the media file that is having trouble and will not loop. I’m using Davinci resolve. Here’s my question: What can I do to fix the encoding? What tools could I use to analyze the encoding and identify problems with it?

I would love to upload the correctly working media file, but it’s a part of a paid asset. I don’t want to upload something I don’t own. If there are tools to analyze that file, I could report the stats here.

Thank you!

[JustJunuh]

As an update, I’ve found that MP4s that feature these two fields will not loop. You can view the Codec data by using VLC. Load the video and do Tools > Codec Information.

An mp4 that excludes these fields does loop.

However, I do not yet know how to strip those two fields from MP4s.

[JustJunuh]

I was able to strip the color metadata fields using ffmpeg.

ffmpeg -i GliderTutorial.mp4 -map_metadata -1 -c copy GliderTutorial2.mp4

However, despite the video stream matching the mp4 that works correctly, this did not cause the video to loop.

[JustJunuh]

Okay! I think I finally got it. I had to switch to the Electra player to finally get it to loop!

To summarize:

1. Render your video from Davinci Resolve to your Movies folder
2. Open a console and cd to the Movies folder
3. Run:

ffmpeg -i Movie.mp4 -map_metadata -1 -c copy Movie-fixed.mp4

3a. You can confirm the color metadata was stripped by running the following command. It should report that each field is unknown.

ffprobe -v error -select_streams v:0 -show_entries stream=color_primaries,color_trc,color_space -of default=noprint_wrappers=1 Movie-fixed.mp4

4. Enable the Electra Player plugin if not already.

Also, here is the command in batch format in case you want to skip opening a terminal. You can just drag and drop your video file onto the .bat file, and it will automatically copy and fix it for you. Easy!

@echo off
setlocal

:: Check if a file was dragged onto the .bat file
if "%~1"=="" (
    echo Please drag and drop an MP4 file onto this script.
    pause
    exit /b
)

:: Get the full input file path
set "input=%~1"

:: Get the file name without extension
set "filename=%~n1"

:: Get the file extension (in case you want to check it's actually .mp4)
set "ext=%~x1"

:: Build the output file name: {NAME}-Fixed.mp4
set "output=%~dp1%filename%-Fixed.mp4"

:: Run ffmpeg command
ffmpeg -i "%input%" -map_metadata -1 -c copy "%output%"

echo Done.
pause