[gst-devel] Manual building of the playbin2.
wl2776 at gmail.com
Fri Apr 9 15:02:07 CEST 2010
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:
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:
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
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
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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