[linux-dvb] VDR 0.80pre8

[Ralph Metzler <rjkm@convergence.de>]

Klaus Schmidinger writes:
 > 1. Audio loss with Pause/SlowMotion/Continue
 > 

See my reply in my last mail (a few minutes ago).


 > 2. Audio loss during normal replay
 > 
 > 3. Audio "chopped" during replay

These will be fixed in the next version.
Some channels really seem to have a big offset between audio and
video and if the video buffer is too small, the audio for the video
data at the buffer exit sometimes has not arrived yet -> audio underflow.
This works fine during normal TV watching since the
hardware/firmware ROM can use the overflow buffer in DRAM.
During playback I cannot (don't know how to) do this and thus need 
more of the original video buffer space.

This will probably be bad for VDR because there is now about 30KB less
OSD memory and I don't know yet if I need more. 
I checked for audio buffer underflows in a longer recording of ZDF
during this "music awards thing" (lots of motion and sound) and 
adjusted the buffer until the dropouts went away. If they still occur
I will have to reclaim more memory.


 > 4. A/V disturbances while recording
 > 

I cannot reproduce this problem. I recorded hours of ZDF and 3Sat and
had no problems. I did not use VDR but "ntuxzap -e" + 
"dd if=/dev/ost/dvr ...". So, I can only assume ... :-)


 > 5. No smooth "Fast Forward/Back"
 > 
 >    When replaying a recording that was done with the new driver and VDR,
 >    the "fast forward/back" function doesn't result in a "smooth" display
 >    as it used to in the old system. Interestingly, when replaying an old
 >    recording on the new system, this function works fine. And it also works
 >    when replaying a new recording on the old system.
 >    I'm not sure what to make of this, whether to assume a problem in the
 >    driver or in VDR.


I assume you extract I-frames from the stream and send them to the
card? As long as the actual ES from which they come is alright, I
also cannot see the difference the old and the new streams should
make.
Can you make examples of the "I-frame-streams" which you send to the
card for each of the cases (old driver's file+new VDR/driver, new driver's
file+new VDR/driver, etc.)?



Ralph





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