[PROBLEM] Video Stutter

[nertskull]

(2nd Oct, 2013 11:38 AM)mk01 Wrote:  and to clear my confusion now, with MB/s you mean MegaBits (Mb) per sec, not megabytes (MB/Mbyte), right? as RPI can hardly do over 15MB/s. 120MB would be quite much even for standard PC on 1Gbit network.

So I'm pretty sure its actually MB as in MegaByte. Here is the output from "dd"

Code:

xbian@xbian ~ $ dd if=/media/Aspartic_Acid/media/video/Movies/ProcessedBD/The_Lord_Of_The_Rings_The_Fellowship_Of_The_Ring_2001_extended_Disc_1.mkv of=/dev/null bs=1M cou
nt=150
150+0 records in
150+0 records out
157286400 bytes (157 MB) copied, 14.924 s, 10.5 MB/s

I'm not great at this stuff, but even if I calculate by hand the 157286400 bytes in 14.924 s then you end up with ~10 megabytes/s

So unless dd is outputting the wrong message it should be megabytes.

And here is the dd output on raspbmc for comparison

Code:

pi@raspbmc:~$ dd if=/media/Aspartic_Acid/media/video/Movies/ProcessedBD/The_Lord_Of_The_Rings_The_Fellowship_Of_The_Ring_2001_extended_Disc_1.mkv of=/dev/null bs=1M count
=150
150+0 records in
150+0 records out
157286400 bytes (157 MB) copied, 1.29605 s, 121 MB/s
pi@raspbmc:~$ dd if=/media/Aspartic_Acid/media/video/Movies/ProcessedBD/The_Lord_Of_The_Rings_The_Fellowship_Of_The_Ring_2001_extended_Disc_1.mkv of=/dev/null bs=1M count
=150
150+0 records in
150+0 records out
157286400 bytes (157 MB) copied, 1.28328 s, 123 MB/s
pi@raspbmc:~$ dd if=/media/Aspartic_Acid/media/video/Movies/ProcessedBD/The_Lord_Of_The_Rings_The_Fellowship_Of_The_Ring_2001_extended_Disc_1.mkv of=/dev/null bs=1M count
=150
150+0 records in
150+0 records out
157286400 bytes (157 MB) copied, 1.29872 s, 121 MB/s
pi@raspbmc:~$ dd if=/media/Aspartic_Acid/media/video/Movies/ProcessedBD/The_Lord_Of_The_Rings_The_Fellowship_Of_The_Ring_2001_extended_Disc_1.mkv of=/dev/null bs=1M count=150
150+0 records in
150+0 records out
157286400 bytes (157 MB) copied, 2.05953 s, 76.4 MB/s

You're right though. I never noticed till now. But I thought the specs for the Pi were on 10/100 Internet. So I'm not sure how on raspbmc its pulling that fast. This is confusing to me.

Quote:So if then recalculate 10.5Mb you report for XBian that's not even 1.5MB/s and with this speed I'm surprised FullHD DTS movie even plays. Can you post your fstab?

There will be something broke as If I try hard (stop XBMC etc) I can get 12.5MB/s from my NFS4 box so even if I admit not everyone running 3com network etc, even on china stuff the difference can not be 1:10. Simply told I would accept to hear 10, 9, maybe even 7. Considering it is only NAS (so not ultra CPU power). But not 1.5. Don't worry, we find it

Here is my fstab

Code:

#
#
#
10.23.24.137:/media/Aspartic_Acid /media/Aspartic_Acid nfs _netdev,defaults,user,auto,noatime,intr 0 0
/dev/mmcblk0p1         /boot           vfat            rw        0       1
/dev/root             /home                   xbian   subvol=home/@,noatime        0       0
/dev/root             /lib/modules            xbian   subvol=modules/@,noatime        0       0
none            /run/shm                        tmpfs                   noauto                  0       0
none            /run/user                       tmpfs                   noauto                  0       0
none            /sys/kernel/debug               debugfs                 noauto                  0       0
none            /sys/kernel/security            securityfs              noauto                  0       0

Which is interesting, because when I put it in, I know I put the NFS mount at the bottom. Don't know how it got moved to the top. I don't remember every getting back into the fstab since that first time.

---

I'm wondering, does the pi cache a video locally? So even though I'm asking it to pull from the NFS, maybe its really pulling from a local cache to get that fast on raspbmc? Because I can't get my head around those numbers. The specification clearly say its 100Mb max. My dd command shows upwards of 800Mb. I don't get it.