An animated logo that previously overlaid another clip may become an opaque rectangle after conversion. Keep the source and test it in the destination editor whenever transparency matters. Successful MP4 playback does not establish that the overlay still works.
The current conversion boundary
Transparency information is called alpha. Mediabunny documents separate keep and discard options, with discard as the default. FileMyLove's current video conversion path does not enable keep-alpha or expose a switch for it.
Video to MP4 is therefore not a guaranteed transparency-preserving workflow. This describes the website's conversion path, not every possible way of creating a file with an MP4 extension.
Separate player background from video content
We recommend testing both source and output in an application that supports them. Place each above a light background and then a dark one, on separate layers, and inspect areas intended to be transparent.
| Observation | Suggested next check |
|---|---|
| Black background only in a player | Do not decide from the player's display alone |
| Source overlays correctly; output covers the lower layer | Return to the source for compositing |
| Source itself is opaque | Check export settings in the original project |
| An edge surrounds the subject | Inspect edges against both backgrounds |
This is a suggested acceptance check, not an alpha-inspection feature inside FileMyLove. Do not assume every converted file will produce the same opaque background color.
Choose the deliverable for the job
For further editing, ask which format and transparency settings the recipient's editor supports. Test a short sample before delivering the entire job, and retain the original project and media.
For a finished clip with a fixed background, compose that background in an editor and export the finished version. The website's converter has no video background-replacement, green-screen removal or missing-alpha recovery control.
Distinguish aspect-ratio padding
Empty borders introduced by fitting a picture into a frame are a separate issue. See black bars after video resizing or iPhone MOV to MP4 for ordinary phone-video conversion.
