Re: [ietf-types] [payload] Video media-types insufficient?

[Magnus Westerlund <[e-mail]>]

Hi,

Roni, if I understand correctly this is about the ISO based mp4 file
format and not the RTP payload format. Thus not really a question for
the Payload WG.

My question to Paul, does you and the browser use the codecs and
profiles parameter that are defined for this type. Please see
http://www.rfc-editor.org/rfc/rfc6381.txt

That is intended to more detailed express which profiles and codecs that
are included in the media type.

Cheers

Magnus

On 2012-05-26 11:53, Roni Even wrote:
> Hi,
> I think this should be discussed in payload WG
> Roni Even
> 
>> -----Original Message-----
>> From: [e-mail] [mailto:[e-mail]]
>> On Behalf Of Paul Libbrecht
>> Sent: Saturday, May 26, 2012 11:28 AM
>> To: IANA Media types
>> Subject: [ietf-types] Video media-types insufficient?
>>
>>
>> hello dear Media-types' expert,
>>
>> the other day, I played with the nifty new video element of HTML5 which
>> seems to be fairly well implemented. This element allows a list of
>> sources together with their media-type so that the browser can find the
>> "video format" that it can play.
>> This element is perfectly following the idea of a media-type's
>> characterization of an exploitable format.
>>
>> However, this characterization is insufficient: the same media-type for
>> videos can be encode data in multiple codecs and these are not encoded
>> in media-types:
>>
>> I met this while using the video/mp4 media-type and realized that our
>> default encoding, the mpeg4 codec, did not play in iPad.
>> So I used the same video element, with a src of media-type pointing to
>> an mp4 file that uses the h264 codec. This one plays on iPad.
>>
>> To me, this is a clear failure of the media-type video/mp4: it does not
>> express sufficiently the playability on a device.
>>
>> Is this something well known?
>> Are there maybe media-type parameters that could help?
>> Are newer video media-types better on this respect?
>>
>> thanks in advance
>>
>> Paul
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> 
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> 


-- 

Magnus Westerlund

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