# MP4/M4V not supported? **URL:** \ **Category:** MusicBrainz Picard\ **Created:** [July 30, 2017, 3:29pm UTC](https://community.metabrainz.org/t/mp4-m4v-not-supported/314835 "2017-07-30T15:29:30Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![steve1977](https://community.metabrainz.org/letter_avatar_proxy/v4/letter/s/a88e57/32.png) [@steve1977](https://community.metabrainz.org/u/steve1977)\ **Post date:** [August 18, 2017, 4:32am UTC](https://community.metabrainz.org/t/mp4-m4v-not-supported/314835/3 "2017-08-18T04:32:38Z")
Thanks for your kind reply. I fixed it by reconverting the files with Handbrake. It is now working, so I assume the issue was with my files and not with Picard. There is a related long-standing issues though about MP4/M4V tags. Let me know if you or someone else could have a look and I am happy to provide sample files or additional context: Artists/Albumartists tags not supported for MP4/M4V > [@MP4 not supporting artists and albumartists tags](https://community.metabrainz.org/t/mp4-not-supporting-artists-and-albumartists-tags/317712): > > This bug exists exists since 2012 ([https://tickets.metabrainz.org/browse/PICARD-376](https://tickets.metabrainz.org/browse/PICARD-376)). Unfortunately, it has not been assigned yet. Hope that someone can look into it. What happens is: Artists (note the “s”) shows up in Picard (artists = xxx; yyy). As described in the 2012 bug report, this tag is proprietary to Picard. When checking with DBPoweramp or others, it shows just as (artists: xxx). The second artist i dropped from the artists file. This issue only exists for MP4 files. Things work f… > --- _[View the full topic](https://community.metabrainz.org/t/mp4-m4v-not-supported/314835)._