[FFmpeg-devel] [PATCH] mp4 and ipod metadata

Baptiste Coudurier baptiste.coudurier
Wed Jun 11 20:44:12 CEST 2008


Michael Niedermayer wrote:
> On Wed, Jun 11, 2008 at 01:05:12PM +0100, M?ns Rullg?rd wrote:
>> Baptiste Coudurier wrote:
>>> Michael Niedermayer wrote:
>>>> On Mon, Jun 09, 2008 at 02:30:34PM -0700, Baptiste Coudurier wrote:
>>>>> Hi all,
>>>>> Atm current mp4 muxer writes non standard and itunes specific metadata.
>>>>> I intend to change this behaviour and to writes these metadata only for
>>>>> -f ipod output format.
>>>> Iam against this change unless there is an actual application for which
>>>> the tags cause problems (which really shouldnt be, applications should
>>>> ignore tags unknown to them, especially if they are within "user data").
>>> First, correct and standards tags exists for 3gp, so itunes tags should
>>> not be written for 3gp, nor for mov since equivalent exist.
>>> Then, as a general attitude, Im against writing non standard features in
>>> perfectly defined standards.
>>> If the user wants them he can use -f ipod format, we are not removing
>>> support for metadata. We created a specific format for this, please
>>> let's use it and stop spreading that mp4 is ipod/itunes format.
>> I'm with Baptiste on this one.
> But you arent mov/mp4 maintainer, while i am and i object to the proposed
> change unless the existing functionality is provided by some other means.
> [existing functionality] being having the ipod tags (which do no harm) in
> other mp4 variants so they can be played on more players.

Well, that's a compromise we have to find.
I see some features needed also, like to be able to set ftyp brand.

Besides, I noticed that for .mov current muxer write double sets of
metadata, and I'd like only one set being the standard .mov way.

So I'd like not to write itunes specific metadata for .mov. Are you ok
with that ?

Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
Smartjog USA Inc.                                http://www.smartjog.com
Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA

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