[mythtv] A couple of questions about mythtv 0.19

Hamish hamish at travellingkiwi.com
Mon Jul 10 20:37:38 UTC 2006


I have a couple of questions... I'm not sure whether these are features I just 
don't understand, or genuine bugs... Hoping someone can help. The system is 
combined front/back ends. AMD 64 X2 4200+. 3GB memory. Hauppage Nova card.

1. Why, when a file doesn't exist, does mythfrontend try 5 or 6 times to open 
the file... Counting down the attempts each time? If it's not there the first 
time, it isn't going to  be there the second... Or third. Or fourth etc.  
Isthere any way to tell it just admit the file isn't there?

2. It seems to be random chance but sometimes when a file isn't present on 
disk, but is  onthe DB, you can't delet it. Yet other times you can. Why?

3. Why is the interface so slow?  Ihave an AMD64 X2 4200+. Sitting in 
the 'select a recoding to watch' screen mythfrontend is using 99% of one 
core. Doing what I have no idea... (strace says it's looping on

select(17, [16], NULL, NULL, {0, 5000}) ioctl(16, FIONREAD, [0])                gettimeofday({1152563349, 448771}, NULL) select(17, [16], NULL, NULL, {0, 5000}) ioctl(16, FIONREAD, [0])                gettimeofday({1152563349, 448843}, NULL) select(17, [16], NULL, NULL, {0, 5000}) ioctl(16, FIONREAD, [0])                gettimeofday({1152563349, 448911}, NULL) select(17, [16], NULL, NULL, {0, 5000}) ioctl(16, FIONREAD, [0])                gettimeofday({1152563349, 448983}, NULL) select(17, [16], NULL, NULL, {0, 5000}) 

This translates into extreeme slowness. Like 2-3 second between pressing a key 
& taking action on it. 

4. Why do I get duplicate recordings? I thought it was designed to record one 
showing of a program. Yet things like Dr Who, which is repeated, when set to 
record any time any channel gets EVERY repeated episode. Same for channels 
like ABC, Sky3 etc which may repeat the same thing 3 times in a single day. I 
get all 3 runs of it.

5. When deleting, sometimes the dialog that pops up says allow re-record, 
sometimes not... What is this dependent on?

6. What's the prebuffering pause for logged below? It seems to cause jerkiness 
on playback (I've seem several people with it, but no answers. I did have it 
a while ago & posted then, but it 'went away'. Not sure why. When I upgraded 
to the X2 from an amd64 3200+ it came back... The software didn't change, 
just the hardware..  Since mplayer can play the same file no problems (With 
about 25 CPU), I know it's not the machine. 

2006-07-10 21:33:49.122 Video timing method: DRM
2006-07-10 21:33:49.189 dropping back audio_buffer_unused
2006-07-10 21:33:49.253 dropping back audio_buffer_unused
2006-07-10 21:33:52.176 NVP: prebuffering pauseAAAAAAAAAAAAAAAAAAAAAAAAAAAAuLL
2006-07-10 21:33:52.209 WriteAudio: buffer underrun
2006-07-10 21:33:55.229 NVP: prebuffering pauseAAAAAAAAAAAAAAAAAAAAAAAAAuAALAL
2006-07-10 21:33:55.266 WriteAudio: buffer underrun

7. Is there any way to resize the playback on the fly? Failing that, can you 
tell myth to use mplayer to payback? I have no problems with mplayer, xine 
etc, but myth playback seems to be a dark art to get working & fails on me at 
the rop of a hat (Usually with the prebuffering pauses above).


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