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Trascoding in RAM for local files
Posted:
Mon Sep 10, 2012 9:34 amby pdneri
I read that online streaming are trascoded in RAM.
I would be interested in testing/having the possibility to do that also for local files that needs trasconding.
HD trascoded videos are not reproduced smoothly on my TV and I suspect it is due to disk performance. In fact while trascoding, cpu usage is at 70% and also network usage is very low.
SD videos are ok.
I would like to make some tests to see if disk is the cause and find a workaround.
Unfortunately I do not have a faster disk to test .... and I have already choosen a second disk for the trascoding temp folder.
Many thanks for help and support!
Davide
Re: Trascoding in RAM for local files
Posted:
Mon Sep 10, 2012 12:58 pmby zip
That's not possible. You can try to run
detailed log, find the ffmpeg command used to transcode, run in manually and check how many FPS it's doing.
Re: Trascoding in RAM for local files
Posted:
Thu Sep 13, 2012 8:57 pmby pdneri
I did it and this is the result:
- Code:
Output #0, mpegts, to 'F:\Serviio temp\Serviio\transcoding-temp-51139-96-ORIGINA
L.stf':
Metadata:
WMFSDKVersion : 12.0.7601.17514
WMFSDKNeeded : 0.0.0.0000
IsVBR : 0
encoder : Lavf54.15.102
Stream #0:0: Video: mpeg2video, yuv420p, 1920x1080, q=2-31, 200 kb/s, 90k tb
n, 29.97 tbc
Stream #0:1: Audio: ac3, 48000 Hz, stereo, flt, 128 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (wmv3 -> mpeg2video)
Stream #0:1 -> #0:1 (wmapro -> ac3)
Press [q] to stop, [?] for help
Multiple frames in a packet from stream 1
frame= 21 fps=0.0 q=3.0 size= 491kB time=00:00:00.63 bitrate=6348.4kbits/s
frame= 43 fps= 41 q=3.0 size= 967kB time=00:00:01.29 bitrate=6120.9kbits/s
frame= 67 fps= 43 q=3.0 size= 1382kB time=00:00:01.77 bitrate=6379.0kbits/s
frame= 92 fps= 44 q=3.0 size= 1819kB time=00:00:02.31 bitrate=6428.1kbits/s
frame= 115 fps= 44 q=3.0 size= 2275kB time=00:00:02.95 bitrate=6295.7kbits/s
frame= 139 fps= 45 q=3.0 size= 2735kB time=00:00:03.59 bitrate=6225.9kbits/s
frame= 149 fps= 41 q=3.0 size= 3060kB time=00:00:04.17 bitrate=6003.3kbits/s
frame= 169 fps= 41 q=3.0 size= 3396kB time=00:00:04.81 bitrate=5778.8kbits/s
frame= 183 fps= 39 q=3.0 size= 3582kB time=00:00:05.10 bitrate=5750.2kbits/s
frame= 197 fps= 38 q=3.0 size= 3833kB time=00:00:05.51 bitrate=5688.0kbits/s
frame= 207 fps= 36 q=3.0 size= 4299kB time=00:00:05.83 bitrate=6032.4kbits/s
frame= 229 fps= 37 q=3.0 size= 5181kB time=00:00:06.47 bitrate=6550.0kbits/s
frame= 248 fps= 37 q=3.0 size= 5865kB time=00:00:07.18 bitrate=6689.5kbits/s
frame= 273 fps= 38 q=3.0 size= 6147kB time=00:00:08.07 bitrate=6232.9kbits/s
frame= 296 fps= 38 q=3.0 size= 6416kB time=00:00:08.94 bitrate=5877.8kbits/s
frame= 317 fps= 38 q=3.0 size= 6717kB time=00:00:09.67 bitrate=5685.0kbits/s
Audio timestamp 942120 < 943171 invalid, cliping
frame= 342 fps= 39 q=3.0 size= 7129kB time=00:00:10.83 bitrate=5392.6kbits/s
frame= 363 fps= 39 q=3.0 size= 7324kB time=00:00:11.24 bitrate=5334.8kbits/s
frame= 394 fps= 40 q=3.0 size= 7633kB time=00:00:12.27 bitrate=5095.7kbits/s
frame= 420 fps= 40 q=3.0 size= 7850kB time=00:00:13.07 bitrate=4920.3kbits/s
frame= 435 fps= 40 q=3.0 size= 8141kB time=00:00:13.83 bitrate=4819.3kbits/s
frame= 439 fps= 38 q=3.0 size= 8913kB time=00:00:14.57 bitrate=5009.5kbits/s
frame= 448 fps= 37 q=3.0 size= 9262kB time=00:00:14.73 bitrate=5149.2kbits/s
frame= 468 fps= 38 q=3.0 size= 9880kB time=00:00:14.99 bitrate=5399.0kbits/s
frame= 486 fps= 37 q=3.0 size= 10558kB time=00:00:15.47 bitrate=5590.7kbits/s
frame= 502 fps= 37 q=3.0 size= 11201kB time=00:00:15.88 bitrate=5775.9kbits/s
... after a while fps decrease to about 25.
Is there something I can do to improve this?
thanks,
Davide
Re: Trascoding in RAM for local files
Posted:
Thu Sep 13, 2012 10:06 pmby zip
if yiu have multicore CPU you can increase number of cores to use in the console.
Re: Trascoding in RAM for local files
Posted:
Fri Sep 14, 2012 9:41 amby Illico
pdneri wrote:... after a while fps decrease to about 25.
Is there something I can do to improve this?
I suggest to uncheck automatic library refresh (orange box)
http://wiki.serviio.org/doku.php?id=ser ... _explainedBecause if serviio refreshes the library during a transcoding, CPU load rising and process fps decreasing.
Re: Trascoding in RAM for local files
Posted:
Fri Sep 14, 2012 7:31 pmby pdneri
thanks both even if not useful.
already 2 cores used.
and I don't think library refresh is the cause because even when fps is 35 at beginning, video is laggy.
could it be a network problem?
transfer rate is "only" 3mb/sec but maybe some other thing is not good enough.
I have a gigabit router and both TV and server use wired lan.
Re: Trascoding in RAM for local files
Posted:
Tue Sep 18, 2012 4:09 pmby qwertinsky
If you have a lot of RAM you could try setting up a RAMDISK and setting Serviio to use the ramdisk as for it's transcode temp file
Re: Trascoding in RAM for local files
Posted:
Wed Sep 19, 2012 7:30 amby pdneri
I have 3gb, I guess I could dedicate 2Gb to a Ram disk. Is this enough?
can you give me some instructions please?
Thanks
Re: Trascoding in RAM for local files
Posted:
Wed Sep 19, 2012 8:09 amby Illico
Re: Trascoding in RAM for local files
Posted:
Wed Sep 19, 2012 1:33 pmby pdneri
Tested: still laggy!
Definitely it is NOT a problem of disk i/o.
Any other suggestion?
while trancoding:
cpu is at 72% (both 2 cores used are at 72%)
1Gb free RAM (out of 3 total)
about 3Mb/s network trhouput (wired gigabit between server and router, wired 100Mbit between router and TV)
none of these seem causing lags
Thanks!
Davide
Re: Trascoding in RAM for local files
Posted:
Wed Sep 19, 2012 1:43 pmby zip
you could let the transcode job finish, then look at the temp transcoded file, rename it to .mpg (from .stf) and add it to your library, then play natively. Does it still lag?
Re: Trascoding in RAM for local files
Posted:
Wed Sep 19, 2012 8:06 pmby pdneri
no, it doesn't.
So we can exclude network.
Already excluded disks.
We need to exclude cpu or ram ...
Re: Trascoding in RAM for local files
Posted:
Sun Nov 11, 2012 8:16 pmby robertsearle
Try this trick
- Start the movie
- pause the movie
- wait for 25 seconds
- unpause / continue playing the movie
Does that make it better or worse?