All things related to multicast

[Bruce Curtis <>]

On Jul 28, 2005, at 10:08 AM, Alan Crosswell wrote:

> WG: I've got a report of some problems with VLC playing the NOAA  
> stuff.  Is anyone else seeing this behavior?

  I'm watching with VLC on a Mac and it looks fine.  Yesterday I  
helped someone here watch with VLC on a PC and it was fine then also.

  The Mac is about 5 years old but has lots of memory.  The PC was a  
laptop that is 1 or two years old.

  In VLC I selected de-interlace under video and then choose Mean.   
Then we chose the full-screen option, the quality of the stream has  
impressed several folks here.

> Bob Bookbinder wrote:
>
> >     I'm playing the stream on my G4 laptop. It looks like it's  
> > using 30% of the CPU and there's 160MB of free memory. The chop  
> > appears to be very regular. One second on and one second off  
> > (approx). A 2GHz Win2K PC exhibits the same chop. rtpqual output  
> > (if I'm reading it right) shows all the packets late??
> >
> > Bob Defaulting to: rtpqual 233.55.245.254 4000 rtp
> > Report from: rgb 233.55.245.254 4000 rtp at Thu Jul 28 10:18:05 2005
> > T Pkts Loss  % Late Bytes |  Pkts  Loss  %  Late     kB Sender
> >  4 112  26  18  108 149616 |   112   26  18  108     146 198.7.235.71
> >  5 284   0   0  284 380592 |   396   26   6  392     517 198.7.235.71
> >  6 217   0   0  217 289740 |   613   26   4  609     800 198.7.235.71
> >  7 285   0   0  285 380820 |   898   26   2  894    1172 198.7.235.71
> >  8 216   0   0  216 289512 |  1114   26   2 1110    1455 198.7.235.71
> >  9 282   0   0  282 376752 |  1396   26   1 1392    1823 198.7.235.71
> > 10 219   1   0  218 293580 |  1615   27   1 1610    2109 198.7.235.71
> > 11 281   0   0  281 375396 |  1896   27   1 1891    2476 198.7.235.71
> > 12 220   0   0  220 294936 |  2116   27   1 2111    2764 198.7.235.71
> > 13 280   0   0  280 374040 |  2396   27   1 2391    3129 198.7.235.71
> > 14 221   0   0  221 296292 |  2617   27   1 2612    3419 198.7.235.71
> > 15 279   0   0  279 372684 |  2896   27   0 2891    3783 198.7.235.71
> > 16 222   0   0  222 296520 |  3118   27   0 3113    4072 198.7.235.71
> > 17 277   0   0  277 369972 |  3395   27   0 3390    4434 198.7.235.71
> > 18 224   0   0  224 299232 |  3619   27   0 3614    4726 198.7.235.71
> > 19 277   0   0  277 369972 |  3896   27   0 3891    5087 198.7.235.71
> > 20 224   0   0  224 299232 |  4120   27   0 4115    5379 198.7.235.71
> > 21 279   0   0  279 372684 |  4399   27   0 4394    5743 198.7.235.71
> > 22 222   0   0  222 296520 |  4621   27   0 4616    6033 198.7.235.71
> > 23 276   0   0  276 368616 |  4897   27   0 4892    6393 198.7.235.71
> > 24 225   0   0  225 300588 |  5122   27   0 5117    6686 198.7.235.71
> > 25 273   0   0  273 364548 |  5395   27   0 5390    7042 198.7.235.71
> > 26 228   0   0  228 304656 |  5623   27   0 5618    7340 198.7.235.71
> > 27 273   0   0  273 364548 |  5896   27   0 5891    7696 198.7.235.71
> > 28 228   0   0  228 304656 |  6124   27   0 6119    7993 198.7.235.71
> > 29 274   0   0  274 365904 |  6398   27   0 6393    8351 198.7.235.71
> > 30 227   0   0  227 303300 |  6625   27   0 6620    8647 198.7.235.71
> > 31 268   0   0  268 357768 |  6893   27   0 6888    8996 198.7.235.71
> > 32 233   0   0  233 311436 |  7126   27   0 7121    9300 198.7.235.71
> > 33 270   0   0  270 360480 |  7396   27   0 7391    9652 198.7.235.71
> > 34 231   0   0  231 308724 |  7627   27   0 7622    9954 198.7.235.71
> > 35 269   0   0  269 360252 |  7896   27   0 7891   10306 198.7.235.71
> > 36 232   0   0  232 310080 |  8128   27   0 8123   10609 198.7.235.71
>
> I'd be more worried about the loss numbers going up.  I'm running  
> it here right now and am seeing similar rtpqual numbers.  On linux  
> the video looks OK and the audio sounds like it might be a little  
> off (as in buffering speeding up/slowing down every so slightly  
> which may have to do with jitter).  But I'm not seeing any video  
> chop.  Your rtpqual seems to confirm that there's no regular loss  
> happening....
>
> I'll cc this to the WG and see if anyone has suggestions.
> /a


---
Bruce Curtis                         

Certified NetAnalyst II                701-231-8527
North Dakota State University