How can I extract the attachment without an aid that is shown by mkvinfo from an MKV file?

Help
1

For example, if the last track ID in the MKV file is 3, followed by an attachment.

.
…
…
| + Track
| + Track number: 4 (track ID for mkvmerge & mkvextract: 3)
| + Track UID: 16902882582786297346
| + Track type: subtitles
| + “Forced display” flag: 1
| + “Lacing” flag: 0
| + Codec ID: S_TEXT/UTF8
|+ EBML void: size 1167
|+ Attachments
| + Attached
| + File name: Covers.jpg
| + MIME type: image/jpeg
| + File data: size 324294
| + File UID: 17997802935195570321
|+ Cluster

Regardless of whether I use:

mkvextract input.mkv attachments 4:covers.jpg
or
mkvextract input.mkv attachments 9223372036854775807:covers.jpg

I get the error:
Error: An attachment with the ID 4 / 9223372036854775807 was not found.

2

Wrong tool: you need to query the file with mkvmerge -i yourfile.mkv or mkvmerge -J yourfile.mkv (the latter outputs JSON which is easier to parse).

1 Like
3

Thank you very much! It works!

Could you please answer this question as well?

What is the system requiremnets?
Toolnix 32 bit program & Win7

4

No, sorry. I simply don’t know the answers.