Thanks for that Andrey! I was surprised to find such limited info on metadata in the ffmpeg doc. That most definitely needs beefing up. :-)
Kieran, I can for sure pass along the doc I'm creating. It's a bit jumbled right now. It's ffmpeg focused in so far as having the commands needed to get what I want in converting different media types to mp4 (specifically AVC/AAC) but I started a separate metadata section because of the problems I was having finding info. It's also focused on what the mp4 container will support but in light of the difficulty finding info I plan to build it out for different media and container types (ex: how to do custom tags if you're working with mkv's). Cheers. Karen On Fri, Jul 14, 2017 at 11:11 AM, Kieran O Leary <[email protected]> wrote: > Hi both, > > On Fri, Jul 14, 2017 at 2:32 PM, Andrey Goreev <[email protected]> wrote: > > > I am pretty sure there was a large table with All the media types listed > > here: https://developer.apple.com/library/content/ > > documentation/QuickTime/QTFF/Metadata/Metadata.html > > > That was the spec I mentioned. I can't find it there. > > > > > I am not able to locate it from my phone right now though. > > There is also one on exiftool webpage. > > > Thanks, yes, that's really useful! > http://owl.phy.queensu.ca/~phil/exiftool/TagNames/QuickTime.html > > On Fri, Jul 14, 2017 at 3:53 PM, Karen Norton <[email protected]> wrote: > > > Thanks for the speedy reply!! Is it just me or is getting info on writing > > metadata tags proving to be a challenge? > > > Yeah it seems so. I'm thinking of adding some info to the ffmpeg > documentation when I have a chance. > > > > I'm having a hard time finding > > comprehensive metadata documentation by media and container type (ex: I > > know mkv allows for custom tags but mp4 doesn't). I checked out that > > webpage you sent Andrey but wasn't able to find all of the flags and > their > > parameters. I will look at it again. If there is a page listing > everything > > that would be great. > > > > You are correct Kieran... media_type is an integer. Thanks. I should have > > thought to try that first although I wouldn't have thought to go to "10". > > > > To be honest I would never have even guessed that it was an INT if I hadn't > looked at the source code. My experience with using -metadata is that your > usually pass a string. > > > > Most likely just 0 and 1. Thanks for sending those github pages!! That > gave > > me what I needed for this flag. > > > > I came across this page (ttps://thediveo-e.blogspot. > > ca/2016/06/adventures-in-ffmpeg-meta-data-writing.html) with a limited > set > > of flags which is what I've been going by but it doesn't have > media_type. I > > discovered this flag via a gui program I have that converts mkv to mp4 > and > > it has built in tagging. You can select "Movie", "Music", "TV Show" and a > > few others. I assumed this was a string field but obviously they have the > > selections mapped to integers as in "1" = Movie, etc. > > > > > I guess the integer is nice as it can allow for a stricter adherence to a > controlled vocabulary. But it adds an extra layer of complexity as that > table of entries must be easily available. As Andrey wrote, exiftool has a > good vocab here too for media_type/stik > http://owl.phy.queensu.ca/~phil/exiftool/TagNames/QuickTime.html > > > > Given metadata is the cornerstone by which we live our lives I'm > surprised > > I'm having such a hard time finding information. I just assumed there > would > > be a metadata bible out there for media. :-) I'm keeping my own document > of > > all the sites I find info on in hopes of piecing everything together. :-) > > > > Can you send that on please? I work in a moving image archive so I am > interested in metadata resources. > > Best, > > Kieran O'Leary > _______________________________________________ > ffmpeg-user mailing list > [email protected] > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
