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Emergency switch down when fragment loading stalls #342

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bharathsn0812 opened this issue Jul 23, 2015 · 9 comments
Closed

Emergency switch down when fragment loading stalls #342

bharathsn0812 opened this issue Jul 23, 2015 · 9 comments
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enhancement fixed/answered

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@bharathsn0812
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Hi Mangui

During Autolevel switch , when higher bit rate quality is being played. The player is not switching to lower quality if bandwith is decreased over the time/some other reason

from given log below we can see (From Google chrome)
media_w341986520_b480000_26.ts?token=8443926090 (failed) video/mp2t Other 5.9 KB 3.8 min
26.ts have failed to load and took 3.8min to Load !

Was able to replicated same in chromelessplayer

Below is the netowork log this condition
Where the content play smoothly for sometime but all of a sudden on one fragment it takes more time to fetch

chunklist_w341986520_b336000.m3u8?token=8443926090 200 vnd.apple.mpegurl Other 7.4 KB 296 ms
chunklist_w341986520_b480000.m3u8?token=8443926090 200 vnd.apple.mpegurl Other 7.4 KB 153 ms
crossdomain.xml 200 text/xml Other 448 B 116 ms
media_w341986520_b336000_0.ts?token=8443926090 200 video/mp2t Other 399 KB 5.32 s
media_w341986520_b336000_1.ts?token=8443926090 200 video/mp2t Other 464 KB 4.66 s
media_w341986520_b336000_2.ts?token=8443926090 200 video/mp2t Other 381 KB 4.27 s
media_w341986520_b480000_0.ts?token=8443926090 200 video/mp2t Other 547 KB 5.91 s
media_w341986520_b480000_3.ts?token=8443926090 200 video/mp2t Other 522 KB 5.19 s
media_w341986520_b480000_4.ts?token=8443926090 200 video/mp2t Other 573 KB 5.36 s
media_w341986520_b480000_5.ts?token=8443926090 200 video/mp2t Other 603 KB 5.87 s
media_w341986520_b480000_6.ts?token=8443926090 200 video/mp2t Other 565 KB 5.37 s
media_w341986520_b480000_7.ts?token=8443926090 200 video/mp2t Other 723 KB 6.30 s
media_w341986520_b480000_8.ts?token=8443926090 200 video/mp2t Other 551 KB 6.16 s
media_w341986520_b480000_9.ts?token=8443926090 200 video/mp2t Other 499 KB 4.87 s
media_w341986520_b480000_10.ts?token=8443926090 200 video/mp2t Other 942 KB 8.29 s
media_w341986520_b480000_11.ts?token=8443926090 200 video/mp2t Other 553 KB 9.96 s
media_w341986520_b480000_12.ts?token=8443926090 200 video/mp2t Other 510 KB 3.66 s
media_w341986520_b480000_13.ts?token=8443926090 200 video/mp2t Other 617 KB 4.53 s
media_w341986520_b480000_14.ts?token=8443926090 200 video/mp2t Other 509 KB 5.01 s
media_w341986520_b480000_15.ts?token=8443926090 200 video/mp2t Other 618 KB 4.37 s
media_w341986520_b480000_16.ts?token=8443926090 200 video/mp2t Other 639 KB 5.43 s
media_w341986520_b480000_17.ts?token=8443926090 200 video/mp2t Other 775 KB 6.00 s
media_w341986520_b480000_18.ts?token=8443926090 200 video/mp2t Other 800 KB 5.79 s
media_w341986520_b480000_19.ts?token=8443926090 200 video/mp2t Other 549 KB 4.43 s
media_w341986520_b480000_20.ts?token=8443926090 200 video/mp2t Other 520 KB 4.53 s
media_w341986520_b480000_21.ts?token=8443926090 200 video/mp2t Other 710 KB 9.14 s
media_w341986520_b480000_22.ts?token=8443926090 200 video/mp2t Other 577 KB 5.81 s
media_w341986520_b480000_23.ts?token=8443926090 200 video/mp2t Other 561 KB 4.57 s
media_w341986520_b480000_24.ts?token=8443926090 200 video/mp2t Other 545 KB 3.99 s
media_w341986520_b480000_25.ts?token=8443926090 200 video/mp2t Other 558 KB 3.38 s
media_w341986520_b480000_26.ts?token=8443926090 (failed) video/mp2t Other 5.9 KB 3.8 min
media_w341986520_b480000_26.ts?token=8443926090 200 video/mp2t Other 706 KB 8.88 s

playlist.m3u8?token=8443926090 200 vnd.apple.mpegurl Other 490 B 129 ms
@bharathsn0812
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This issues is consistent .

@mangui
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mangui commented Jul 23, 2015

yes if the bandwidth suddenly drops while a fragment is being loaded, there is no emergency switch down.
a way to fix this could be to monitor the fragment loading, and if after a certain duration, loading is stalled, we should abort this fragment loading and force an emergency switch down.

this monitoring should be performed here : https://github.com/mangui/flashls/blob/dev/src/org/mangui/hls/loader/FragmentLoader.as#L151

@mangui mangui changed the title Auto Quality switch error Emergency switch down when fragment loading stalls Jul 23, 2015
@bharathsn0812
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Hi

I tested this issue with single quality URL

http://218.248.64.73:1935/vod/_definst_/smil:cds/187364_PC_Download.smil/chunklist_w2042544433_b336000.m3u8?token=8443926090

The issue is fragment load time taking.

But 3.8min consistent !! is there any paramter to limit fragment load time

media_w2042544433_b336000_35.ts?token=8443926090 200 video/mp2t Other 468 KB 4.84 s
media_w2042544433_b336000_36.ts?token=8443926090 200 video/mp2t Other 381 KB 3.67 s
media_w2042544433_b336000_37.ts?token=8443926090 (failed) video/mp2t Other 2.8 KB 3.8 min
crossdomain.xml 200 xml Other 542 B 539 ms
a.png?0.45823744125664234 200 png Other 3.2 KB 276 ms
media_w2042544433_b336000_37.ts?token=8443926090 200 video/mp2t Other 360 KB 6.12 s
media_w2042544433_b336000_38.ts?token=8443926090 200 video/mp2t Other 477 KB 5.76 s
media_w2042544433_b336000_39.ts?token=8443926090 200 video/mp2t Other 493 KB 5.56 s
media_w2042544433_b336000_40.ts?token=8443926090 200 video/mp2t Other 455 KB 5.21 s
media_w2042544433_b336000_41.ts?token=8443926090 200 video/mp2t Other 536 KB 6.39 s

@mangui
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mangui commented Jul 23, 2015

no, not for the moment.

@bharathsn0812
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When TS file is loaded partially and made to reload same TS. This error is showed infinite time

WARN:TS: reparsing PMT, unknown PID found
VM103594:1 DEBUG:position/audio/video/NetStream bufferLength:608.20/0.00/0.00/0.08

mangui added a commit that referenced this issue Jul 31, 2015
@mangui
monitor fragment loading and abort and emergency switch down in case …
3920f48 
…of sudden bw drop.

related to #342
mangui added a commit that referenced this issue Jul 31, 2015
@mangui
update swf/swc
05b36fd 
related to #342
@mangui
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mangui commented Jul 31, 2015

should be working now, plz recheck on your hand

mangui added a commit that referenced this issue Jul 31, 2015
@mangui
fix regression introduced by #342
04fd547
mangui added a commit that referenced this issue Jul 31, 2015
@mangui
update swf/swc
0216d97 
related to #342
@bharathsn0812
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Working fine

Thank you :)

@bharathsn0812
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Working fine when the content is in auto quality.
But when manually switch to highest bit-rate (hls_levels) and the network is NOT/maybe capable of playing that speed
it stalls and if we try to manually switch to auto or other lower bit rate, it is not effecting and continues to be in fetching state//buffering state of highest quality TS file.
*Manual / auto switching under this error is not happening.

This error introduced after emergency switch down added to player.

Scenario can be created using chromlessflash hls.

Please check
Network logs Taken from chrome
media_w855019756_b480000_16.ts?token=8443926090 200 video/mp2t Other 639 KB 4.79 s
media_w855019756_b480000_17.ts?token=8443926090 200 video/mp2t Other 3.1 KB 33.53 s
chunklist_w855019756_b1464000.m3u8?token=8443926090 200 vnd.apple.mpegurl Other 7.8 KB 470 ms
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 368 KB 5.23 s
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 320 KB 5.23 s
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 318 KB 5.23 s
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 272 KB 5.25 s
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 396 KB 5.21 s
media_w855019756_b1464000_10.ts?token=8443926090 200 video/mp2t Other 290 KB 4.81 s
media_w855019756_b1464000_11.ts?token=8443926090 200 video/mp2t Other 251 KB 4.93 s
media_w855019756_b1464000_11.ts?token=8443926090 200 video/mp2t Other 314 KB 4.93 s
media_w855019756_b1464000_11.ts?token=8443926090 200 video/mp2t Other 295 KB 4.93 s
media_w855019756_b1464000_11.ts?token=8443926090 200 video/mp2t Other 266 KB 4.94 s
media_w855019756_b1464000_11.ts?token=8443926090 200 video/mp2t Other 294 KB 4.93 s

mangui added a commit that referenced this issue Aug 17, 2015
@mangui
only monitor fragment loading rate when in auto quality mode and when…
ad6a58d 
… level is not lowest

related to #342
mangui added a commit that referenced this issue Aug 17, 2015
@mangui
only monitor fragment loading rate when in auto quality mode and when…
9ba7f7c 
… level is not lowest

update swf/swc
related to #342
@mangui
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mangui commented Aug 17, 2015

@bharathsn0812 plz recheck with latest flashls/dev
issue should be fixed

@mangui mangui closed this as completed Oct 27, 2015
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