Missing metadata for MP4

[cjee21]

When video from Android phone is re-encoded with FFmpeg, MediaInfo does not show some metadata such as the location and video encoder for MP4 files. The metadata is present in the file and is shown by FFmpeg/FFprobe. For MKV files, MediaInfo does show such info.

Sample video

sample.mp4

[cjee21]

Just came across this issue that looks similar: MediaArea/MediaInfo#453

Side note: on the other hand, there are some mp4 tags in other files that are shown by MediaInfo but not by FFprobe or Mp3tag.

[cjee21]

Found that ExifTool is showing metadata that MediaInfo does not show.

For example, on videos from Samsung phone, there is a Samsung Model field.

On videos from Android phones and transcoded by FFmpeg, there are video encoder (such as Lavc61. 31.100 av1_qsv), Android version and location/GPS coordinates (the sample file attached above does not have Android version in it due to 2nd FFmpeg pass for trimming).

For videos from other Android phones, MediaInfo also does not show the location tag nicely compared to ExifTool. It shows xyz as tag name and the GPS coordinates end with a slash without formatting.