[FFmpeg-user] Trying to add metadata media_type to mp4

Karen Norton nortok00 at gmail.com
Fri Jul 14 18:30:56 EEST 2017

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).



On Fri, Jul 14, 2017 at 11:11 AM, Kieran O Leary <kieran.o.leary at gmail.com>

> Hi both,
> On Fri, Jul 14, 2017 at 2:32 PM, Andrey Goreev <aegoreev at gmail.com> 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 <nortok00 at gmail.com> 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
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