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

[Karen Norton]

Thanks for the speedy reply!! Is it just me or is getting info on writing
metadata tags proving to be a challenge? 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".
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.

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. :-)

Cheers.


Karen


On Fri, Jul 14, 2017 at 9:32 AM, 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/documentat
> ion/QuickTime/QTFF/Metadata/Metadata.html
> I am not able to locate it from my phone right now though.
> There is also one on exiftool webpage.
>
> Sent from my Samsung Galaxy smartphone.
> -------- Original message --------From: Kieran O'Leary <
> kieran.oleary at irishfilm.ie> Date: 2017-07-14  3:13 AM  (GMT-07:00) To:
> FFmpeg user questions <ffmpeg-user at ffmpeg.org> Subject: Re: [FFmpeg-user]
> Trying to add metadata media_type to mp4
>
> Hi,
>
> It looks like media_type does not take a string like "media_type" as its
> value, but an Integer, according to the source code:
> https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/movenc.c#L3327
>
> So the default seems to be 0 if you provide some text, which produces a
> value of 'Movie', but if you use -metadata media_type=1 , then the value
> becomes Music. From trial and error, it looks like
> -metadata media_type=10
> will produce a value of TV Show.
>
> It looks like mediainfo has a good list of what the values produce:
> https://github.com/MediaArea/MediaInfoLib/blob/080212c30baea
> 3f85602eaf61aa8feaedb983971/Source/MediaInfo/Multiple/
> File_Mpeg4_Elements.cpp#L2682
>
> It looks like what ffmpeg calls media_type is mapped to ContentType in
> Mediainfo. i can't find any information about either element inthe
> QuickTime specification, though.
>
> Best,
>
> Kieran O'Leary
> IFI Irish Film Archive.
> ------
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