Ok here's some test data. I took a free mp3 from archive.org and transcoded it to webm using this command:

❯ ffmpeg -i test.mp3 -c:a libopus -b:a 128k -map_metadata 0 -vn test.webm

When I then run the lofty tag_reader example from the matroska branch on the file it doesn't seem to pick up the tags. Should this work?

...
warning: `lofty` (lib) generated 5 warnings
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
     Running `target/debug/examples/tag_reader /Users/miles/dl/output.webm`
--- Tag Information ---
Title: None
Artist: None
Album: None
Genre: None
Album Artist: BUDDY CLARK, Bud Freeman, Morey Feld, Jess Stacy, Marty Marsala, Brad Gowans, Pee Wee Russell, Sid Weiss, Mack Gordon
--- Audio Properties ---
Bitrate (Audio): 0
Bitrate (Overall): 0
Sample Rate: 48000
Bit depth: 32
Channels: 2

ffprobe seems to be able to read the tag:

❯ ffprobe test.webm
Input #0, matroska,webm, from 'test.webm':
  Metadata:
    title           : THIS IS THE BEGINNING OF THE END (El Principio del Fin)
    COMMENT         : https://archive.org/details/78_this-is-the-beginning-of-the-end-el-principio-del-fin_buddy-clark-bud-freeman-mor_gbia0349177b
    ARTIST          : BUDDY CLARK, Bud Freeman, Morey Feld, Jess Stacy, Marty Marsala, Brad Gowans, Pee Wee Russell, Sid Weiss, Mack Gordon
    track           : 01
    ALBUM           : THIS IS THE BEGINNING OF THE END (El Principio del Fin)
    GENRE           : Fox-Trot
    TLEN            : 175.19
    ENCODER         : Lavf61.7.100
  Duration: 00:02:55.20, start: -0.007000, bitrate: 145 kb/s
  Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
      Metadata:
        ENCODER         : Lavc61.19.101 libopus
        DURATION        : 00:02:55.202000000

webm-tag-test.zip

Uh oh!

Webm support #141

Description

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions