[FFmpeg-devel] Apple Prores Support

[Maxim]

David Ogden schrieb:
> On 4 September 2010 15:28, compn <tempn at twmi.rr.com> wrote:
>
>   
>> On Sat, 4 Sep 2010 17:21:33 +0300, Kostya wrote:
>>     
>>> On Sat, Sep 04, 2010 at 09:58:28AM -0400, David Ogden wrote:
>>>       
>>>> I've been reading everything I can find in reference to prores support
>>>>         
>> in
>>     
>>>> ffmpeg and just arriving at dead ends.
>>>>
>>>> It all seems tantalizingly close, what would be required to finally get
>>>>         
>> this
>>     
>>>> codec up and working? Samples? Testing? Money :)
>>>>         
>> >From what I know, the latter. The guy(s) who was/were REing stopped
>>     
>>> because of lack of aforementioned stuff.
>>>       
>> i dont see any info on the wiki:
>> http://wiki.multimedia.cx/index.php?title=Apple_ProRes
>>
>> at least mplayer has some support for (binary codec) prores now, so you
>> can use it on linux/windows boxes.
>>
>> -compn
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel at mplayerhq.hu
>> https://lists.mplayerhq.hu/mailman/listinfo/ffmpeg-devel
>>
>>     
>
> The problem with using the existing decoder via mplayer is that Apple seems
> to have crippled the performance on Windows machines.
>   

ProRes is based on multi-threading: it allocates as many
encoding/decoding threads as many processors you have. So be sure you
have multiply cores and the multi-threading is active (inside Mplayer)...

> How much cash would be needed to get this done? Maybe I could convince my
> employer to pay? Maybe the people who want this could start a fund? Maybe
> we're only looking at $20 :D In which case I'll pay directly!
>   

I've been working on a support for that codec in FFmpeg for a while. The
biggest problem is that we only have binary codecs but no official
specification. In order to figure out how that codec works we need to
reverse engineer its binary:
http://en.wikipedia.org/wiki/Reverse_engineering
This is a very time-consuming task that requires to analyze many hundred
kilobytes of code and cannot be done in a week. There are only few
people working on RE of multimedia codecs and those are very busy now.
So the roadblock can be defined as "insufficient manpower"...

Best regards
Maxim