[FFmpeg-devel] [PATCH] Add four metadata tags to 3gp files

[Benoit Fouet]

Hi Baptiste,

Baptiste Coudurier wrote:
> Horacio Sanson wrote:
>   
>> On Tue, Sep 9, 2008 at 4:16 AM, Baptiste Coudurier
>> <baptiste.coudurier at smartjog.com> wrote:
>>     
>>> Hi,
>>>
>>> Horacio Sanson wrote:
>>>       
>>>
>>>>              mov_write_3gp_udta_tag(pb, s, "titl", s->title);
>>>>              mov_write_3gp_udta_tag(pb, s, "auth", s->author);
>>>>              mov_write_3gp_udta_tag(pb, s, "gnre", s->genre);
>>>>              mov_write_3gp_udta_tag(pb, s, "dscp", s->comment);
>>>>              mov_write_3gp_udta_tag(pb, s, "albm", s->album);
>>>>              mov_write_3gp_udta_tag(pb, s, "yrrc", "nil");
>>>> +            mov_write_string_tag(pb, "\251nam", s->title, 0);
>>>> +            mov_write_string_tag(pb, "\251aut", s->author, 0);
>>>> +            mov_write_string_tag(pb, "\251des", s->comment, 0);
>>>> +            mov_write_string_tag(pb, "\251cpy", s->copyright, 0);
>>>>         
>>> Are these standardized in 3gp ? I don't think so, 3gp uses differents
>>> tags IIRC like coded. Doesn't your content providers support 3gp tags ?
>>> I might be inclined to allow this if not...
>>>
>>>       
>> Believe me I wish I could quote the standard and tell you these tags
>> are there but I can't. Blame Quicktime pro that is the defacto
>> authoring tool used by all content creators here in Japan. Quicktime's
>>  property editor allows to add these four tags to MOV, 3gpp and 3g2
>> files that are displayed on all mobile phones in Japan (i.e. a lot of
>> devices) so pretty much is a standard here.
>>     
>
> Well, 3GPP is the only _standard_.
>
> Humm hopefully I quickly checked with quicktime player before answering,
> and here my quicktime player display correctly title (using -title) and
> copyright (using -copyright) in my 3gp file.
>
> Do you still have a problem ? I added -copyright support just today did
> you try again ?
>
>   

these are DoCoMo tags, they are not, AFAIK, in the standards, but are
the way the content providers write their content for iMode, IIRC...

>> On the other hand these tags are exactly the same tags used in
>> MODE_MOV, I simply add them to 3gp and 3g2 files. Maybe it would be
>> better to not differentiate between these three modes at all and add
>> all those tags to the files (3gp, 3p2, mov, mp4) so the tags can be
>> seen in as many devices/programs as possible.... just an idea.
>>     
>
> I'd prefer being standard here.
>
>   

you'll find lots of file following the scheme presented in this
request... this is not standard, but widely used for iMode anyway...

-- 
Benoit Fouet
Purple Labs S.A.
www.purplelabs.com