Can I edit an MP4 thumbnail without disabling the sound?

[Daniel_BMS]

I tried IDTE - ID3 Tag Editor to edit an image into the default video file thumbnail, but the video would not play with sound after doing so. Is there a program that can simply change the thumbnail image without getting rid of sound?

[Selur]

Depends on the way the thumbnail is generated, if it's simply a scene from the file it normally depends on the filter/extension which creates the thumbnail.
If that extension/filter also recognizes (itunes) cover tags, one could simply remux and add the desired image as cover. (using MP4Box via command line or one of the many GUIs which support mp4box)

>IDTE - ID3 Tag Editor
sorry, but editing an mp4 file with an mp3 tag editor sounds kind of wrong,..

[awgie]

Sort of a late reply, but I was looking for the same thing, and found this post that promises to be helpful.

[Daniel_BMS]

This was a big surprise. I will try out MetaX.