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

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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