Gapless Playback with Playbin

[David W. Harks]

GStreamer wizards,

My GStreamer-based app is intended to play H.264 video clips 
back-to-back in gapless fashion. It uses playbin and the 
'about-to-finish' signal to change URIs, as the various examples and 
advice about this shows.

Unfortunately, I'm seeing a 5-10 frame 'pause' when switching URIs. What 
seems to be happening is that the sink stops rendering frames for a 
brief period, leaving a static frame visible, then 'catches up' and 
starts rendering again, skipping the first few frames of the next clip. 
I tried taking the same clips and playing them with gst-play-1.0 
--gapless and I get the same result.

My question is, how can I narrow down what's going on here? And is there 
anything I can do to get frame-perfect transitions? I created a debug 
log with GST_DEBUG=5 here: 
https://www.dropbox.com/s/0rdzlrcaz77wbkc/dbg.out.gz

Unfortunately, I'm not quite sure how to interpret this output.

Thanks for your expertise!

-d