我有一些旧硬件，所以我不指望奇迹。我想以标准质量从网络摄像头流式传输到 ustream。
我使用的代码如下
sudo ffmpeg -re -f v4l2 -i /dev/video1 -f flv "rtmp://1.16543hvtJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)"
或者
sudo ffmpeg -re -f v4l2 -r 25 -s 640x480 -i /dev/video1 -f flv "rtmp://1.166aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)
我得到的结果如下
Tasks: 102 total, 1 running, 99 sleeping, 2 stopped, 0 zombie
Cpu(s): 5.7%us, 0.7%sy, 0.0%ni, 93.6%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 1920560k total, 339028k used, 1581532k free, 19112k buffers
Swap: 1963004k total, 0k used, 1963004k free, 129300k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3176 root 20 0 222m 31m 24m S 5.0 1.7 0:01.60 ffmpeg
and
Metadata:
encoder : Lavf53.32.100
Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 640x480, q=2-31, 200 kb/s, 1k tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> flv)
Press [q] to stop, [?] for help
frame= 330 fps= 5 q=2.5 size= 808kB time=00:01:02.70 bitrate= 105.5kbits/s dup=0 drop=137
我怎样才能进一步推动系统发展，或者找出我的瓶颈在哪里？
server@cryo:~$ ffmpeg -re -f v4l2 -r 25 -s 640x480 -i /dev/video0 -f flv "rtmp://1.1654tJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)" ffmpeg version 0.10.9-7:0.10.9-1~precise1 Copyright (c) 2000-2013 the FFmpeg developers
built on Oct 4 2013 06:37:30 with gcc 4.6.3
configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.9-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
avcodec configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.9-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libvo-amrwbenc
libavutil 51. 35.100 / 51. 35.100
libavcodec 53. 61.100 / 53. 61.100
libavformat 53. 32.100 / 53. 32.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 61.100 / 2. 61.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
libpostproc 52. 0.100 / 52. 0.100
[video4linux2,v4l2 @ 0x252f4a0] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 120370.039311, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj422p, 640x480, -4 kb/s, 25 tbr, 1000k tbn, 25 tbc
Incompatible pixel format 'yuvj422p' for codec 'flv', auto-selecting format 'yuv420p'
[buffer @ 0x253d2c0] w:640 h:480 pixfmt:yuvj422p tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 0x253d6c0] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
[scale @ 0x253df60] w:640 h:480 fmt:yuvj422p -> w:640 h:480 fmt:yuv420p flags:0x4
Output #0, flv, to 'rtmp://1.16543355.fme.ustream.tv/ustreamVideo/16543355/BGcZ5ejm9mx5WxCXXbJ3xRfLWhvtJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)':
Metadata:
encoder : Lavf53.32.100
Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 640x480, q=2-31, 200 kb/s, 1k tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg -> flv)
Press [q] to stop, [?] for help
frame= 198 fps= 12 q=2.0 size= 222kB time=00:00:16.60 bitrate= 109.6kbits/s
或者
server@cryo:~$ ffmpeg -re -f v4l2 -r 25 -s 640x480 -i /dev/video1 -f flv "rtmp://1.16543355.fme.ustream.tv/ustreamVideo/16543355/BGcZ5ejm9mx5WxCXXbJ3xRfLWhvtJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)"
ffmpeg version 0.10.9-7:0.10.9-1~precise1 Copyright (c) 2000-2013 the FFmpeg developers
built on Oct 4 2013 06:37:30 with gcc 4.6.3
configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.9-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
avcodec configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.9-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-aacenc --enable-libvo-amrwbenc
libavutil 51. 35.100 / 51. 35.100
libavcodec 53. 61.100 / 53. 61.100
libavformat 53. 32.100 / 53. 32.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 61.100 / 2. 61.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
libpostproc 52. 0.100 / 52. 0.100
[video4linux2,v4l2 @ 0x262a4a0] The driver changed the time per frame from 1/25 to 1/30
[video4linux2,v4l2 @ 0x262a4a0] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video1':
Duration: N/A, start: 163282.070169, bitrate: 147456 kb/s
Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 tbr, 1000k tbn, 30 tbc
Incompatible pixel format 'yuyv422' for codec 'flv', auto-selecting format 'yuv420p'
[buffer @ 0x26382a0] w:640 h:480 pixfmt:yuyv422 tb:1/1000000 sar:0/1 sws_param:
[buffersink @ 0x2638640] auto-inserting filter 'auto-inserted scale 0' between the filter 'src' and the filter 'out'
[scale @ 0x2638ee0] w:640 h:480 fmt:yuyv422 -> w:640 h:480 fmt:yuv420p flags:0x4
Output #0, flv, to 'rtmp://1.16543355.fme.ustream.tv/ustreamVideo/16543355/BGcZ5ejm9mx5WxCXXbJ3xRfLWhvtJ6aU flashver=FME/2.5\20(compatible;\20FMSc\201.0)':
Metadata:
encoder : Lavf53.32.100
Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 640x480, q=2-31, 200 kb/s, 1k tbn, 30 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> flv)
Press [q] to stop, [?] for help
frame= 83 fps= 5 q=4.4 size= 267kB time=00:00:16.13 bitrate= 135.3kbits/s dup=0 drop=36