[Qt-interest] [OT] RE: video codecs

[Mehmet Kaplan]

i know that phonon automatically detects the video type, container, codec
etc. and read the video if its codec is installed in system.but i want to
get the 100th frame of that video for example, for processing the frame .
phonon plays the video automatically, but phonon doesn't present any
interface for taking a frame of a video.

On Fri, Jun 12, 2009 at 4:15 PM, Srdjan Todorovic <
todorovic.s at googlemail.com> wrote:

> Hi,
>
> On 12/06/2009, Mehmet Kaplan <mehmetkpln at gmail.com> wrote:
> > "What do you mean by THE codec? There is no such thing as THE codec on a
> > system."I don't mean a static codec. i mean all the codecs currently
> > installed on the system.
>
> > as an example when user tries to process a video file with xvid codec, my
> > program won't let it. but after the user installed xvid codec to his/her
> > system, without any change on my program i want to process any video file
> > with xvid codec.
>
> But that's assuming that *every single* codec uses an identical
> interface. Which is unlikely.
>
> As far as I can understand (and I've not played with phonon), you want
> something that will automatically enumerate any video codec that
> happens to be in any location on the hard drive, and to add these
> codecs to a collection, so that your application can pick and choose
> which codec to use for decoding a video file.
>
> I can only guess that Phonon already has interfaces built for some
> codecs, and has codec enumeration and loading support, so I guess one
> does something like:
>
>   /* pseudo-code ! */
>   PhononPlayer *player = new PhononPlayer();
>   PhononMedia * media = new PhononMedia("/tmp/myVideo.avi");
>   player->play(media);
>
> and Phonon will automatically detect the video type (by headers) and
> load the correct codec from it's codec collection.
>
> And you dont want to do:
>
>   Player *p = new Player();
>   p->setType(h261xa, xanim_drivers, "XAnim's CCITT H.261");
>   Media *m = new Media("/tmp/myVideo.avi");
>   p->play(media);
>
> Because that means holding a collection of codecs and being able to
> detect the codec used in the file.
>
> Is all that right?
>
> Srdjan
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