Truncated Data

[velezericn]

So i have a python script where i'm writing metadata to mp4s

Code Select Expand

cmd = [exiftool_path, "-overwrite_original","-CreateDate={}".format(date_and_time_no_dashes), file]

So i'm able to write to mp4s and apply meta data perfectly fine but sometimes i get

Warning: Truncated 'moov' data (missing 5721 bytes)
or
Warning: Truncated 'mdat' data

Truncated moov data doesn't display metadata when i check it in exiftool but truncated mdat data will sometimes be fine and no problem or it'll not show in exiftool

why is it that it sometimes truncates? is it due to file corruption of mp4? i'm not really sure whats going on

[Phil Harvey]

The truncated media data is indicative of a corrupted file.  This can happen if a transfer (eg. download) is aborted before the full file is received.

- Phil

[penginex]

I have the same problem, I think the video file is fine and the command I use is：

exiftool -api LargeFileSupport -m -p C:\Windows\gpx.fmt -ee3 D:/Photo/Insta360/VID_20230618_184959_00_041.insv > C:\Desktop\aa.txt

Results：

Warning: Truncated '?\x00\x00\x00' data - D:/Photo/Insta360/VID_20230618_184959_00_041.insv

But.. Now insta360 studio 4.8.0 You can now export gpx 

[Phil Harvey]

That warning isn't indicative of a problem in an Insta360 video.  It is because there is some sort of unrecognized trailer appended to the file that doesn't conform to the container format.  The video data itself is OK.  Truncated 'mdat' data as earlier in this thread is bad, and does indicate video data corruption.

- Phil