[FFmpeg-user] ATSC TS live transcode on DL360 G4?

[Subscriptions]

Hello again,

This is to conclude this topic and share information which may be 
useful for others:

Live transcode of one mpeg2 TS coming at ~17Mb/s to h264 at ~5Mb/s is 
now working on DL360 G4 server with 2 double core Intel Xeon @ 3.4 GHz 
(4 cores in total). Needs **LATEST** lib264 
(x264-snapshot-20130331-2245). It looks there were performance 
enhancements to this library recently.

A DL360 G5 with 2 quad core  Intel(R) Xeon(R) CPU E5440  @ 2.83GHz (8 
cores in total) is able to transcode 4 transponders coming at this speed 
with the same x264 library.

Channels for transcode are captured via Hdhomerun box over-the-air.

Thanks, and hope this is helpful - George.


Le 2013-02-01 09:20, Subscriptions a écrit :
> Hello again,
>
> It simply looks that 2 double-core Xeon at 3.4Ghz (HP DL 360) can not
> transcode mpeg2 ts live stream coming at ~20 Mb/s to h264. Even with
> 'preset ultrafast' the load goes above 4 and the buffer overruns. The
> minimal processor that is able to do this up to now is a single 
> Phenom
> 2 X6 Black at 3.4 Ghz, and it sometimes gets with load ~5 on it's six
> cores.
>
> Thanks, George
>
>
> Hello,
>
> I want to reduce bit rate of ~18Mb/s ATSC live stream which I capture
> over the air with HDHomerun box, and it looks that an HP DL360 G4
> server (two 64 bit double core Xeon processors) can not do the job. 
> Is
> there some way to make this functional? My idea is to reduce the
> stream from 18Mb/s to about 4-5Mb/s at hd720. The problem is that
> processor load goes over 4 and starts to overrun the buffer. Is there
> a way to make the transcoding somehow work with x264 on that 
> computer?
>
> Thanks, George.
>
> nice -n -20 ffmpeg -i
> "udp://239.255.254.1:1234?fifo_size=6000000&overrun_nonfatal=1&"
> -acodec copy -c:v libx264 -crf 22 -preset fast -f mpegts
> udp://239.255.254.240:1234
>
> ffmpeg version 1.0 Copyright (c) 2000-2012 the FFmpeg developers
>   built on Oct 16 2012 09:46:44 with gcc 4.7 (Debian 4.7.2-4)
>
>  Stream #0:0[0x31]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002),
> yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 15000 kb/s, 63.81 fps, 59.94
> tbr, 90k tbn, 119.88 tbc
>
> using cpu capabilities: MMX2 SSE2 SSE3 Cache64
> Output #0, mpegts, to 'udp://239.255.254.240:1234':
>   Metadata:
>     encoder         : Lavf54.29.104
>     Stream #0:0: Video: h264, yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
> q=-1--1, 90k tbn, 59.94 tbc
>     Stream #0:1(eng): Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
> 5.1(side), 384 kb/s
>
>
> Tasks:  82 total,   2 running,  80 sleeping,   0 stopped,   0 zombie
> %Cpu0  : 96.3 us,  1.0 sy,  0.0 ni,  0.3 id,  0.0 wa,  0.0 hi,  2.3 
> si, 0.0 st
> %Cpu1  : 95.7 us,  1.0 sy,  0.0 ni,  1.0 id,  0.0 wa,  0.0 hi,  2.3 
> si, 0.0 st
> %Cpu2  : 97.7 us,  1.3 sy,  0.0 ni,  0.3 id,  0.0 wa,  0.0 hi,  0.7 
> si, 0.0 st
> %Cpu3  : 96.0 us,  0.7 sy,  0.0 ni,  2.0 id,  0.0 wa,  0.0 hi,  1.3 
> si, 0.0 st
> KiB Mem:   3995312 total,  2685548 used,  1309764 free,    74516 
> buffers
>
> processor       : 3
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 4
> model name      : Intel(R) Xeon(TM) CPU 3.40GHz
>
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