[mythtv-users] 0.19, XvMC, and Prebuffer pause

[Steve Malenfant]

So I've compared a few programs, Terminator 3, Olympic and American Idol.
There is huge difference in the number of buffer allocated.  I'll include
what I think is relevant here, but I'll save the log for later.  The only
one that play fine is Terminator 3 which uses 65384 KB buffers.  That's
actually the only stream that works on my box right now.  So is it possible
that this buffer management isn't working properly or the buffer aren't
suited right?  Who can bring the attention of this to one of the developper
(if not reading, and if my info is relevant)?

Terminator 3(1080i, WGCL, perfect playback, 0.18 recording) :
stream: start_time: 38308.760 duration: 8335.827 bitrate=18421 kb/s
2006-02-24 20:31:52.445 detectInterlace(Detect Scan, Detect Scan, 29.97,
1088) ->Interlaced Scan
2006-02-24 20:31:52.445 Interlaced: Interlaced Scan  video_height: 1088
fps: 29.97
2006-02-24 20:31:52.447RingBuf(myth://192.168.11.24:6543/1046_20060219210000.mpg):
CalcReadAheadThresh(65384 KB)
                         -> threshhold(2650 KB) min read(32 KB) blk size(512
KB)

Olympic (1080i, NBC, stutters, 0.19 recording) :
stream: start_time: 64275.281 duration: 14176.624 bitrate=15627 kb/s
2006-02-24 20:44:36.735 detectInterlace(Detect Scan, Detect Scan, 29.97,
1088) ->Interlaced Scan
2006-02-24 20:44:36.735 Interlaced: Interlaced Scan  video_height: 1088
fps: 29.97
2006-02-24 20:44:36.736RingBuf(myth://192.168.11.24:6543/1111_20060223200400.mpg):
CalcReadAheadThresh(16384 KB)
                         -> threshhold(856 KB) min read(32 KB) blk size(256
KB)


American Idol (720p, FOX, stutters, 0.19 recording) :

stream: start_time: 65694.620 duration: 3605.606 bitrate=12973 kb/s
2006-02-24 20:33:23.624 detectInterlace(Detect Scan, Detect Scan, 59.9401,
720) ->Progressive Scan
2006-02-24 20:33:23.625 Interlaced: Progressive Scan  video_height: 720
fps: 59.9401
2006-02-24 20:33:23.632RingBuf(myth://192.168.11.24:6543/1051_20060223200000.mpg):
CalcReadAheadThresh(15384 KB)
                         -> threshhold(819 KB) min read(32 KB) blk size(256
KB)

Steve M.

On 2/24/06, Ray Lischner <linux at tempest-sw.com> wrote:
>
> On Friday 24 February 2006 11:13 am, Joe Silver wrote:
>
> > The pauses aren't so much pauses as they are momentary (like 1/10th of
> > a second) blip in the audio.  Maybe the video skips too, but it's much
> > easier to notice the audio.
>
> Another reason why I may not have noticed anything so far. A minor blip
> in the sound of skis slicing through snow would not draw my attention.
> Once I can clear the Olympics off my disk drive, I'll try to pay
> attention and see whether I can detect the prebuffering pauses.
> --
> Ray Lischner
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