Exiftool Command for Removing HandlerVendorID from MP4 Files

[sersoap]

Apologies in advance if this sounds like a novice question, but I'm curious about the exiftool command used by exifcleaner to remove the HandlerVendorID parameter from MP4 files. When attempting
exiftool input.mp4 -handlervendorid:all=
I receive a warning stating

Code Select Expand

Warning: Not a deletable group: handlervendoridCould someone provide clarification on this issue?

[wywh]

It seems HandlerVendorID is forced to .mp4 [edit: as far as ffmpeg output, just found a .mp4 without it]. But ffmpeg can rewrap .mov to .mov without it. Why do you want to remove it?

Code Select Expand

exiftool -a -G1 -s -HandlerVendorID= input.mov
Warning: Sorry, HandlerVendorID is not writable
Nothing to do.

ffmpeg -i input.mov -c copy output.mov
ffmpeg -i output.mov -c copy output.mp4

exiftool -a -G1 -s -HandlerVendorID .
======== ./output.mov
======== ./input.mov
[Track1]        HandlerVendorID                 : Apple
[Track1]        HandlerVendorID                 : Apple
[Track2]        HandlerVendorID                 : Apple
[Track2]        HandlerVendorID                 : Apple
[Track3]        HandlerVendorID                 : Apple
[Track3]        HandlerVendorID                 : Apple
[Track4]        HandlerVendorID                 : Apple
[Track4]        HandlerVendorID                 : Apple
[Track5]        HandlerVendorID                 : Apple
[Track5]        HandlerVendorID                 : Apple
======== ./output.mp4
[QuickTime]     HandlerVendorID                 : Apple
https://exiftool.org/TagNames/QuickTime.html

- Matti

[sersoap]

Just cause i have no sympathy for Apple
Optimizing useless metadata, im writing a python script just for fun

The solution doesn't really do the trick cause it doesn't reduce the video's metadata, it add VideoHandelr: FFMPEG

[StarGeek]

One thing about your original command. In tag names, anything before the colon is the group name, with the actual tag name coming afterwards.  So when you write handlervendorid:all, you are telling exiftool to look for a group named "handlervendorid", which doesn't exist.

If HandlerVendorID was deletable (which exiftool cannot do, see the Quicktime tags page), you would simply use
-HandlerVendorID=

[Phil Harvey]

HandlerVendorID is a necessary part of the handler structure.  You can get rid of the Apple footprints, but you don't save any space by doing this.

- Phil