On Feb 7, 2008, at 7:26 AM, Daniel Arfsten wrote:
Hello all,
I am using ivtv 0.10.1 with Ubuntu Feisty MythTV 0.20.2-fixes. I run
a PVR-350 with s-video IN from a SA3250HD STB using a ir-blaster to
change the channels. I am getting dropping frames. I have tried all
the solutions that I could find on the internet but it still hasn't
solved the issue.
<snip>
dmesg shows this error whenever a recording occurs and the only
other thing that I am doing is running 2 torrents.
[540732.313149] ivtv0: All encoder MPEG stream buffers are full.
Dropping data.
[540732.313153] ivtv0: Cause: the application is not reading fast
enough.
I also happened to use my myth box as my BitTorrent machine for a
while, and observed the exact same thing. Plain and simply, BitTorrent
is a resource-intensive application and so is MythTV recording with a
PVR-x50. So much so that the computer cannot keep up with both tasks.
I have found that setting the MythTV "User Job" (ie Commercial
Flagging) CPU utilization to "Low" helps out, as that is also an I/O
intensive process. Running BitTorrent with a nice -20 might also help.
The bottom line, however, is that if you want a solid PVR-350
recording, you have to have enough CPU and I/O resources to store it
as fast as the PVR-350 is recording it. In your case, that might mean
not running BitTorrent or any other I/O intensive applications while
recording.
- Rick
I have checked all hard drives, according to dmesg, they have DMA set.
ata1.00: configured for UDMA/133
ata2.00: configured for UDMA/133
I have set the PCI latency on the hard drive controllers to 176 per
a suggestion I found. lspci shows:
00:0f.0 IDE interface: VIA Technologies, Inc. VT8237A SATA 2-Port
Controller (rev 80) (prog-if 8f [Master SecP SecO PriP PriO])
Subsystem: ASRock Incorporation Unknown device 0591
Flags: bus master, medium devsel, latency 176, IRQ 21
I changed the ivtv parameters to increase the buffers. I use this
in /etc/modprobe.conf:
options ivtv enc_yuv_buffers=32 enc_mpg_buffers=16
enc_vbi_buffers=16 enc_pcm_buffers=16
it appears that the parameters are being used by looking at dmesg |
grep ivtv:
[ 19.223220] ivtv0: Registered device video0 for encoder MPEG (16
MB)
The only other thing that sticks out is this message in dmesg:
[ 18.779434] ivtv0: Encoder revision: 0x02050032
[ 18.779438] ivtv0: Recommended firmware version is 0x02060039.
Could that be the problem? How would I go about changing the
firmware for the PVR-350? If someone could point me to an exact
guide I would appreciate it. Also, ivtv was "just installed"
automagically in ubuntu so I never had to compile it or anything
like that. Would something mess up if I only change out the
firmware? Excuse the questions but I am new to firmware and what
not. Is firmware just like drivers or modules?
So I can't think of what else to do to solve this. Can anyone
suggest anything???
Daniel
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