[mythtv-users] Stuttering on some mpg files (PrebufferEnoughFrames)

Ian Evans dheianevans at gmail.com
Mon Dec 23 18:05:26 UTC 2013


On Mon, Dec 23, 2013 at 12:43 PM, Ian Evans <dheianevans at gmail.com> wrote:

> On Mon, Dec 23, 2013 at 5:41 AM, Stephen Worthington <
> stephen_agent at jsw.gen.nz> wrote:
>
>> On Mon, 23 Dec 2013 03:02:33 -0500, you wrote:
>>
>> >On Sat, Dec 21, 2013 at 9:22 PM, Ian Evans <dheianevans at gmail.com>
>> wrote:
>> >
>> [snip
>>
>
>
>> ]>Ok...I forgot that the files in question are on an USB external drive.
>> But
>>
>> >I thought I read here that some are using them for older file storage.
>> Are
>> >there any settings I should be checking to see that I'm getting the
>> correct
>> >data transfer speed?
>>
>> To see if it is the USB drive that is the problem, just try moving one
>> of the problem files to a storage group that is on a SATA drive.
>> MythTV checks all storage groups to find the files, so you can move
>> recording files freely between storage group locations.  Use the I key
>> twice and scroll down to see the file name for any recording.
>>
>> USB 2 drives are pretty slow, but should be fast enough to play back
>> any recording as long as the drive is not busy doing something else at
>> the same time.
>>
>
> yep, it's the USB drive. Don't know why it's giving me speeds so slow:
>
> sudo hdparm -tT /dev/sdc1
>
> /dev/sdc1:
>  Timing cached reads:     2 MB in  2.05 seconds = 999.51 kB/sec
>  Timing buffered disk reads:   4 MB in  4.10 seconds = 999.83 kB/sec
>
>
rebooted and got this for the same drive:

Timing cached reads:   3578 MB in  2.00 seconds = 1789.24 MB/sec
 Timing buffered disk reads:  64 MB in  3.00 seconds =  21.30 MB/sec
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