Hello Christoph, 

That sounds like a good point but the data indicates that usb bandwidth should 
not be an issue.

I use a spare SSD device for the recordings and I have also tested with a 
classic hard disc and also with an NFS share. Always the same issue.

The performance of the SSD is:

14# dd if=/dev/zero of=./test bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 45.2508 s, 23.2 MB/s

15# hdparm -tT /dev/sda1

/dev/sda1:
 Timing cached reads:   710 MB in  2.00 seconds = 354.27 MB/sec
 Timing buffered disk reads:  88 MB in  3.06 seconds =  28.75 MB/sec

A speed of 20+ MB/s should be sufficient to record an HD channel.

While doing this test I can watch HD TV without any artefacts. 

Any other idea? 

Matthias


Am 08.08.2016 um 11:10 schrieb C.Scheeder:
> Hi,
> it meuns your system is not able to process all the data received in time.
> where do you write your recordings?
> I guess its a usb-harddisk connected to your raspi, correct?
> It's probably just to slow to write all the data vdr throws at it.
> Or your usb-bus is saturated with all the data flowing in from your receiver 
> and back out to the harddisk.
> Christoph
> 
> Am 07.08.2016 um 16:34 schrieb Matthias Bodenbinder:
>> One more hint to the problem.
>>
>> Another test with recording Arte HD gives the following output in user.log:
>>
>> Aug  7 16:31:14 raspberry vdr: [28148] timer 1 (5 1503-1655 'Galaxis 
>> Milchstraße') set to event Son 07.08.2016 15:05-16:45 (VPS: 07.08. 15:05) 
>> 'Galaxis Milchstraße'
>> Aug  7 16:31:19 raspberry vdr: [6438] i/o throttle activated, count = 1 
>> (tid=6438)
>> Aug  7 16:31:22 raspberry vdr: [6438] buffer usage: 70% (tid=6448)
>> Aug  7 16:31:24 raspberry vdr: [6438] buffer usage: 80% (tid=6448)
>> Aug  7 16:31:26 raspberry vdr: [6438] buffer usage: 90% (tid=6448)
>> Aug  7 16:31:29 raspberry vdr: [6438] buffer usage: 100% (tid=6448)
>> Aug  7 16:31:29 raspberry vdr: [6438] ERROR: 1 ring buffer overflow (1 bytes 
>> dropped)
>> Aug  7 16:31:35 raspberry vdr: [6438] ERROR: 26189 ring buffer overflows 
>> (4923532 bytes dropped)
>> Aug  7 16:31:41 raspberry vdr: [6438] ERROR: 32283 ring buffer overflows 
>> (6069204 bytes dropped)
>> Aug  7 16:31:47 raspberry vdr: [6438] ERROR: 36593 ring buffer overflows 
>> (6879484 bytes dropped)
>>
>>
>> What does that mean?
>>
>> Matthias
>>
>> _______________________________________________
>> vdr mailing list
>> vdr@linuxtv.org
>> https://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr
>>
> 
> 
> _______________________________________________
> vdr mailing list
> vdr@linuxtv.org
> https://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr


_______________________________________________
vdr mailing list
vdr@linuxtv.org
https://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr

Reply via email to