[FFmpeg-devel] [PATCH] als in mp4

[Jai Menon]

On Sat, Mar 21, 2009 at 11:52 AM, Baptiste Coudurier
<baptiste.coudurier at gmail.com> wrote:
> Jai Menon wrote:
>> On Sat, Mar 21, 2009 at 11:24 AM, Baptiste Coudurier
>> <baptiste.coudurier at gmail.com> wrote:
>>> Hi Jai,
>>>
>>> Jai Menon wrote:
>>>> Hi,
>>>>
>>>> Attached :
>>>>
>>>> 1) demux als streams from mp4, als codec id and minor lavc version bump
>>>> 2) mux als in to mp4, add isomedia type
>>>>
>>>> [...]
>>>>
>>>> @@ -1381,7 +1385,8 @@
>>>> ? ? ?uint8_t *buf;
>>>>
>>>> ? ? ?for (i = 0; i < s->nb_streams; i++)
>>>> - ? ? ? ?if (mov->tracks[i].enc->flags & CODEC_FLAG_BITEXACT) {
>>>> + ? ? ? ?if (mov->tracks[i].enc->flags & CODEC_FLAG_BITEXACT ||
>>>> + ? ? ? ? ? ?mov->tracks[i].enc->codec_id == CODEC_ID_MP4ALS) {
>>>> ? ? ? ? ? ? ?return 0;
>>>> ? ? ? ? ?}
>>>>
>>> ???? Please explain :>
>>
>> ok :)
>> the muxer currently writes out a userdata box, with a meta box inside
>> (mp4 mode).
>> The meta box has a itunes hdlr tag which again leads to problems. So the patch
>> skips writing a udta box. maybe instead of this, we could write mov style udta.
>> what do you suggest?
>>
>> btw, very sorry most of this looks like a hack, the reference codec
>> mp4 parser has
>> limitations.
>>
>
> Humm, sorry too hackish, where can I get this reference codec mp4 parser ?

http://www.nue.tu-berlin.de/forschung/projekte/lossless/mp4alsRM22.zip

i dunno if there is a newer version which is publicly available.
maybe Justin knows?

-- 
Regards,

Jai