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greubel
Visitor
‎01-15-2011 06:20 AM

Prebuffering ?

I hooked up a web cam through Chaneru using HLS.
Works OK but there is about a minute and 20 second delay !
Is there any way to reduce the amount of prebuffering in Roku and go more realtime ?
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5 REPLIES 5
renojim
Community Streaming Expert
‎01-15-2011 01:59 PM

Re: Prebuffering ?

How long are your segments? I understand at least three segments will be buffered before play starts.

-JT
Roku Community Streaming Expert

Help others find this answer and click "Accept as Solution."
If you appreciate my answer, maybe give me a Kudo.

I am not a Roku employee.
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greubel
Visitor
‎01-15-2011 02:50 PM

Re: Prebuffering ?

I tried different segments sizes with the same result, a minute and a half delay. Also I hit a problem with Roku not closing the pre-buffering on small clips. If a small clip's segments end before Roku finishes with the pre-buffering, it just sits there with the progress indicator at 95%. Never reads the index file to get the fact that it's closed.
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RokuKevin
Visitor
‎01-17-2011 08:56 AM

Re: Prebuffering ?

Do you have a publicly accessible url of the small clip that never plays?? I'd like to take a look at that.

Thanks,

--Kevin
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greubel
Visitor
‎01-18-2011 12:18 PM

Re: Prebuffering ?

Kevin, I'm unable to locate that sequence. I've been trying for the last two days to reproduce it, but no luck.
I did run across a different problem with rebuffering. I am transcoding and streaming a 1280x720 AVI file.
It seems that no matter what I set the segment duration to, it always fails around segment 4 and rebuffers.
Fails both on 1509 and 1529. But does not occur with the .ts files static.
The first rebuffer actually starts the whole movie over which is a problem for 10 sec segments.
You have to rewatch the first 30 seconds of it again.


10 seconds - 7 segments size is between 7 and 9 meg and rebuffers at .ts 4
8 seconds - 7 segments size is between 5 and 7 meg and rebuffers at .ts 4
6 seconds - 9 segments size is between 4 and 5 meg and rebuffers at .ts 4
4 seconds - 12 segments size is between 2 and 4 meg and rebuffers at .ts 4 11
2 seconds - 22 segments size is between 1.5 and 2 meg and rebuffers at .ts 5 10 19
1 seconds - 42 segments size is between .6 and 1 meg and rebuffers at .ts 5 10 22 33

Live Stream with transcode
12:47:28 "HEAD /Roku/Pictures/2010-07-13/056.AVI HTTP/1.1" 301 0
12:47:28 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 125
12:47:29 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000001.ts HTTP/1.1" 200 1046596
12:47:30 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 158
12:47:31 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000002.ts HTTP/1.1" 200 1088708
12:47:32 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000003.ts HTTP/1.1" 200 1074608
12:47:33 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 191
12:47:34 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000004.ts HTTP/1.1" 200 958048
12:47:35 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 224
12:47:36 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000005.ts HTTP/1.1" 200 120000 <-------- was reset
12:47:37 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000005.ts HTTP/1.1" 200 984744
12:47:38 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 290
12:47:39 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000006.ts HTTP/1.1" 200 1009372
12:47:40 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000007.ts HTTP/1.1" 200 1022908
12:47:40 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 323
12:47:41 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000008.ts HTTP/1.1" 200 1028172
12:47:43 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 356
12:47:44 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000009.ts HTTP/1.1" 200 1053928
12:47:45 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 389
12:47:46 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000010.ts HTTP/1.1" 200 1062952
12:47:48 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 422
12:47:50 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 488
12:47:51 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000010.ts HTTP/1.1" 200 1062952 <-------- reloaded but was good
12:47:53 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000011.ts HTTP/1.1" 200 1185716
12:47:53 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 521
12:47:54 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000012.ts HTTP/1.1" 200 1021592
12:47:55 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000013.ts HTTP/1.1" 200 1132700
12:47:55 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 554
12:47:56 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000014.ts HTTP/1.1" 200 1116344
12:47:57 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000015.ts HTTP/1.1" 200 982676
12:47:58 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 587
12:47:59 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000016.ts HTTP/1.1" 200 936428
12:48:00 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 653
12:48:01 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000017.ts HTTP/1.1" 200 907852
12:48:02 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000018.ts HTTP/1.1" 200 869312
12:48:03 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 686
12:48:04 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000019.ts HTTP/1.1" 200 930976
12:48:05 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 719
12:48:06 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000020.ts HTTP/1.1" 200 990948
12:48:08 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 752
12:48:09 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000021.ts HTTP/1.1" 200 906348
12:48:10 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 818
12:48:11 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000022.ts HTTP/1.1" 200 920260
12:48:12 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000022.ts HTTP/1.1" 200 920260 <-------- reloaded but was good
12:48:13 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 851
12:48:14 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000023.ts HTTP/1.1" 200 739028
12:48:15 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000024.ts HTTP/1.1" 200 1098484
12:48:15 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 884
12:48:16 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000025.ts HTTP/1.1" 200 929096
12:48:18 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 917
12:48:19 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000026.ts HTTP/1.1" 200 1026292
12:48:20 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 950
12:48:22 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000027.ts HTTP/1.1" 200 1500428
12:48:23 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 983
12:48:24 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000028.ts HTTP/1.1" 200 956544
12:48:25 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1016
12:48:26 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000029.ts HTTP/1.1" 200 1016704
12:48:28 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1082
12:48:29 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000030.ts HTTP/1.1" 200 1001852
12:48:30 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000031.ts HTTP/1.1" 200 920448
12:48:30 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1115
12:48:31 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000032.ts HTTP/1.1" 200 963876
12:48:33 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1148
12:48:34 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000033.ts HTTP/1.1" 200 987752
12:48:35 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000033.ts HTTP/1.1" 200 987752 <-------- reloaded but was good
12:48:35 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1181
12:48:37 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000034.ts HTTP/1.1" 200 1021592
12:48:38 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1214
12:48:39 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000035.ts HTTP/1.1" 200 1035316
12:48:40 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1247
12:48:42 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000036.ts HTTP/1.1" 200 1319384
12:48:43 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1280
12:48:44 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000037.ts HTTP/1.1" 200 1458316
12:48:45 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1.m3u8 HTTP/1.1" 200 1313
12:48:46 "GET /C:\Users/Jim/My%20Roku/Live%20Stream/stream1-00000038.ts HTTP/1.1" 200 706316

Same .ts files built from previous stream but static. No problem !
12:57:30 "HEAD /Roku/Live/stream1.m3u8 HTTP/1.1" 200 184
12:57:30 "GET /Roku/Live/stream1.m3u8 HTTP/1.1" 200 1461
12:57:32 "GET /Roku/Live/stream1-00000001.ts HTTP/1.1" 200 1046596
12:57:33 "GET /Roku/Live/stream1-00000002.ts HTTP/1.1" 200 1088708
12:57:34 "GET /Roku/Live/stream1-00000003.ts HTTP/1.1" 200 1074608
12:57:35 "GET /Roku/Live/stream1-00000004.ts HTTP/1.1" 200 958048
12:57:36 "GET /Roku/Live/stream1-00000005.ts HTTP/1.1" 200 984744
12:57:37 "GET /Roku/Live/stream1-00000006.ts HTTP/1.1" 200 1009372
12:57:39 "GET /Roku/Live/stream1-00000007.ts HTTP/1.1" 200 1022908
12:57:40 "GET /Roku/Live/stream1-00000008.ts HTTP/1.1" 200 1028172
12:57:41 "GET /Roku/Live/stream1-00000009.ts HTTP/1.1" 200 1053928
12:57:42 "GET /Roku/Live/stream1-00000010.ts HTTP/1.1" 200 1062952
12:57:43 "GET /Roku/Live/stream1-00000011.ts HTTP/1.1" 200 1185716
12:57:44 "GET /Roku/Live/stream1-00000012.ts HTTP/1.1" 200 1021592
12:57:46 "GET /Roku/Live/stream1-00000013.ts HTTP/1.1" 200 1132700
12:57:47 "GET /Roku/Live/stream1-00000014.ts HTTP/1.1" 200 1116344
12:57:48 "GET /Roku/Live/stream1-00000015.ts HTTP/1.1" 200 982676
12:57:49 "GET /Roku/Live/stream1-00000016.ts HTTP/1.1" 200 936428
12:57:50 "GET /Roku/Live/stream1-00000017.ts HTTP/1.1" 200 907852
12:57:51 "GET /Roku/Live/stream1-00000018.ts HTTP/1.1" 200 869312
12:57:52 "GET /Roku/Live/stream1-00000019.ts HTTP/1.1" 200 930976
12:57:53 "GET /Roku/Live/stream1-00000020.ts HTTP/1.1" 200 990948
12:57:54 "GET /Roku/Live/stream1-00000021.ts HTTP/1.1" 200 906348
12:57:55 "GET /Roku/Live/stream1-00000022.ts HTTP/1.1" 200 920260
12:57:56 "GET /Roku/Live/stream1-00000023.ts HTTP/1.1" 200 739028
12:57:57 "GET /Roku/Live/stream1-00000024.ts HTTP/1.1" 200 1098484
12:57:58 "GET /Roku/Live/stream1-00000025.ts HTTP/1.1" 200 929096
12:58:00 "GET /Roku/Live/stream1-00000026.ts HTTP/1.1" 200 1026292
12:58:01 "GET /Roku/Live/stream1-00000027.ts HTTP/1.1" 200 1500428
12:58:02 "GET /Roku/Live/stream1-00000028.ts HTTP/1.1" 200 956544
12:58:03 "GET /Roku/Live/stream1-00000029.ts HTTP/1.1" 200 1016704
12:58:05 "GET /Roku/Live/stream1-00000030.ts HTTP/1.1" 200 1001852
12:58:06 "GET /Roku/Live/stream1-00000031.ts HTTP/1.1" 200 920448
12:58:07 "GET /Roku/Live/stream1-00000032.ts HTTP/1.1" 200 963876
12:58:08 "GET /Roku/Live/stream1-00000033.ts HTTP/1.1" 200 987752
12:58:09 "GET /Roku/Live/stream1-00000034.ts HTTP/1.1" 200 1021592
12:58:10 "GET /Roku/Live/stream1-00000035.ts HTTP/1.1" 200 1035316
12:58:12 "GET /Roku/Live/stream1-00000036.ts HTTP/1.1" 200 1319384
12:58:13 "GET /Roku/Live/stream1-00000037.ts HTTP/1.1" 200 1458316
12:58:14 "GET /Roku/Live/stream1-00000038.ts HTTP/1.1" 200 706316
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RokuKevin
Visitor
‎01-18-2011 04:26 PM

Re: Prebuffering ?

Do you have a stream url I could look at?

Thanks,

--Kevin
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