Manual building of the playbin2.

[wl2776]

Stefan Kost consulted me on this question already and recommended to build everything from scratch.

However, I have spent some time on this question already, therefore I wanted to come to some logical accomplishment.

So. My task is to play a video and a sound from separate files. Currently I have some media files, where DV-video is stored in the AVI container and the sound is stored in WAV files with the same name and the .wav extension.

I've built a playbin2 instance with .wav file. This is it: player.png (200kb),  player.dot (33kb).

Then, basing on bus messages, I've detected that video is missing, found and added a video stream. This resulted in the following pipeline: 0.00.47.167824000-player.png (480kb), original dot: 0.00.47.167824000-player.dot (20kb).

The algorithm was the following.
I've created a uridecodebin, set up a new bus, bus watch and no-more-pads signal handler.
Then added this uridecodebin to a playbin2, set it to paused state and retrieved all messages until error or EOS occurred, or until no-more-pads handler set a special flag, that it has done.

When no-more-pads handler is called, the uridecodebin instance has already created an element chain and a proxy pad. The handler finds this pad, requests the pad from the playsink (which was created automagically earlier) and links them. Then it signals 'reconfigure' to the playsink, and the playsink builds a playing chain for this new pad. Then it sets a special flag, in order the message loop to finish.

Almost all is complete. Video and audio are playing, and even in sync for the first time.

The problem is that this pipeline has a bad reaction to the seek events and tries playing,
when I pause or stop it.
Sound disappears, or plays every time from the beginning.

What else should I set to get sound in place?

I've initially created a playbin2 with the sound file and added a video. I didn't experiment with reverse order yet.

[Stefan Sauer]

wl2776 wrote:
> Stefan Kost consulted me on this question already and recommended to build
> everything from scratch.
>  

And I can only repeat that I don't suggest to hack it into playbin2. I
still propose to have your own toplevel pipeline and use two uridecodebins.

Stefan

> However, I have spent some time on this question already, therefore I wanted
> to come to some logical accomplishment.
>
> So. My task is to play a video and a sound from separate files. Currently I
> have some media files, where DV-video is stored in the AVI container and the
> sound is stored in WAV files with the same name and the .wav extension.
>
> I've built a playbin2 instance with .wav file. This is it:
> http://n4.nabble.com/file/n1819292/player.png player.png (200kb) ,  
> http://n4.nabble.com/file/n1819292/player.dot player.dot (33kb) .
>
> Then, basing on bus messages, I've detected that video is missing, found and
> added a video stream. This resulted in the following pipeline:
> http://n4.nabble.com/file/n1819292/0.00.47.167824000-player.png
> 0.00.47.167824000-player.png (480kb) , original dot:
> http://n4.nabble.com/file/n1819292/0.00.47.167824000-player.dot
> 0.00.47.167824000-player.dot (20kb) .
>
> The algorithm was the following.
> I've created a uridecodebin, set up a new bus, bus watch and no-more-pads
> signal handler.
> Then added this uridecodebin to a playbin2, set it to paused state and
> retrieved all messages until error or EOS occurred, or until no-more-pads
> handler set a special flag, that it has done.
>
> When no-more-pads handler is called, the uridecodebin instance has already
> created an element chain and a proxy pad. The handler finds this pad,
> requests the pad from the playsink (which was created automagically earlier)
> and links them. Then it signals 'reconfigure' to the playsink, and the
> playsink builds a playing chain for this new pad. Then it sets a special
> flag, in order the message loop to finish.
>
> Almost all is complete. Video and audio are playing, and even in sync for
> the first time.
>
> The problem is that this pipeline has a bad reaction to the seek events and
> tries playing,
> when I pause or stop it.
> Sound disappears, or plays every time from the beginning.
>
> What else should I set to get sound in place?
>
> I've initially created a playbin2 with the sound file and added a video. I
> didn't experiment with reverse order yet.
>  

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