在运行ffmpeg到ffserver全新安装 Xubuntu 12.10。
我刚刚从头安装了 Xubuntu 12.10，然后安装了 ffmpeg。我插入了我的网络摄像头（请注意，我在另一个系统 Ubuntu 12.04 和 11.04 上使用过这个网络摄像头，使用相同的ffserver命令没有任何问题），然后运行 ffmpeg 命令：
ffmpeg -f video4linux2 -i /dev/video0 http://IP:8090/cam1.ffm
从理论上来说这应该可行但我得到的是：
fmpeg version 0.8.4-6:0.8.4-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
built on Nov 6 2012 16:49:20 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
ffmpeg: /build/buildd/libav-0.8.4/libavutil/mathematics.c:79: av_rescale_rnd: Assertion `c > 0' failed.
Aborted (core dumped)
我搜索过该错误，但找不到任何地方。因此，我尝试使用 mplayer 查看网络摄像头是否正常工作，如果video0正常工作：
mplayer tv:// -tv device=/dev/video0:driver=v4l2:width=352:height=288
它运行完美并向我显示了我的网络摄像头屏幕。
现在我想，好吧，也许这个愚蠢的弃用事情与它有关，所以我尝试使用 avconv 对 ffmpeg 执行完全相同的命令，但出现了同样的错误。
lsusb给我：
Bus 001 Device 003: ID 04fc:1528 Sunplus Technology Co., Ltd SPCA1527A/SPCA1528 SD card camera (webcam mode)
正如我所说的，我在另外两台安装了不同 Ubuntu 的电脑上安装了完全相同的网络摄像头。
编辑：
我已ffmpeg根据以下说明重新编译：
https://ffmpeg.org/trac/ffmpeg/wiki/UbuntuCompilationGuide
它可以工作，如果我使用与上面相同的命令，它就会运行，CPU 以 100% 运行，就像它在转换一样。但没有输出ffmpeg，它只是无限期地挂在这里，直到我ctrl-c：
ffmpeg version git-2013-01-01-fde1305 Copyright (c) 2000-2013 the FFmpeg developers
built on Jan 1 2013 11:42:21 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3
libavutil 52. 13.100 / 52. 13.100
libavcodec 54. 85.100 / 54. 85.100
libavformat 54. 58.102 / 54. 58.102
libavdevice 54. 3.102 / 54. 3.102
libavfilter 3. 30.102 / 3. 30.102
libswscale 2. 1.103 / 2. 1.103
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[video4linux2,v4l2 @ 0x97c8200] DTS discontinuity in stream 0: packet 3 with DTS 21527529506, packet 4 with DTS 21527577460
然后我ctrl-c两次得到这个：
^CEstimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 21527.513483, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj420p, 320x240, -2147483 kb/s, 18.08 tbr, 1000k tbn, 1000k tbc
http://IP:8090/cam1.ffm: Input/output error
Received signal 2: terminating.
好的，让我看看如果我指定帧速率会发生什么：
ffmpeg -r 2 -f video4linux2 -i /dev/video0 http://IP:8090/cam1.ffm
ffmpeg version git-2013-01-01-fde1305 Copyright (c) 2000-2013 the FFmpeg developers
built on Jan 1 2013 11:42:21 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3
libavutil 52. 13.100 / 52. 13.100
libavcodec 54. 85.100 / 54. 85.100
libavformat 54. 58.102 / 54. 58.102
libavdevice 54. 3.102 / 54. 3.102
libavfilter 3. 30.102 / 3. 30.102
libswscale 2. 1.103 / 2. 1.103
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[video4linux2,v4l2 @ 0xa5fa2a0] DTS discontinuity in stream 0: packet 3 with DTS 21627329870, packet 4 with DTS 21627409821
[video4linux2,v4l2 @ 0xa5fa2a0] max_analyze_duration 5000000 reached at 5000000
[video4linux2,v4l2 @ 0xa5fa2a0] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 21627.313851, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj420p, 320x240, 0 kb/s, 2 fps, 0.25 tbr, 1000k tbn, 2 tbc
Incompatible pixel format '(null)' for codec 'flv', auto-selecting format '(null)'
Last message repeated 1 times
[flv @ 0xa6046c0] Specified pixel format yuvj420p is invalid or not supported
Output #0, ffm, to 'http://198.144.186.224:8090/cam1.ffm':
Metadata:
creation_time : now
Stream #0:0: Video: flv1 ([0][0][0][5] / 0x5000000), yuvj420p, 320x2, q=255-255, 200 kb/s, 1000k tbn, 2 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg -> flv)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
我的ffserver配置文件如下所示（尽管我说过它之前在另一台电脑上运行良好）：
Port 8090
BindAddress IP
MaxHTTPConnections 30
MaxClients 20
MaxBandwidth 2000
CustomLog -
<Feed cam1.ffm>
File /tmp/cam1.ffm
FileMaxSize 10000K
</Feed>
<Stream cam1.flv>
Feed cam1.ffm
Format flv
VideoCodec flv
VideoFrameRate 2
VideoBufferSize 20000
VideoBitRate 200
VideoQMin 5
VideoQMax 10
VideoSize qvga
PreRoll 0
Noaudio
AVOptionVideo flags +global_header
</Stream>
<Stream stat.html>
Format status
</Stream>
编辑2：
刚刚确认在我的 Ubuntu 11.04 机器上运行它工作正常，命令有点不同，但它有效：
ffmpeg -r 10 -s 320x240 -f video4linux2 -aspect 4:3 -i /dev/video0 http://IP:8090/cam1.ffm
所以我将此命令复制到其他 Xubuntu 系统中，并遇到了missing yuvj420p之前的问题：
[video4linux2,v4l2 @ 0xb1c53e0] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 27867.321194, bitrate: N/A
Stream #0:0: Video: mjpeg, yuvj420p, 320x240, -1 kb/s, 10 tbr, 1000k tbn, 10 tbc
Incompatible pixel format '(null)' for codec 'flv', auto-selecting format '(null)'
Last message repeated 1 times
[flv @ 0xb1ca6e0] Specified pixel format yuvj420p is invalid or not supported
Output #0, ffm, to 'http://198.144.186.224:8090/cam1.ffm':
Metadata:
creation_time : now
Stream #0:0: Video: flv1 ([0][0][0][5] / 0x5000000), yuvj420p, 320x10, q=255-255, 200 kb/s, 1000k tbn, 10 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mjpeg -> flv)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
ffmpeg上面发布了我在 Xubuntu 机器上运行时的配置信息，下面是我ffmpeg在 Ubuntu 11 机器上运行时显示的内容：
FFmpeg version 0.6.6-4:0.6.6-0ubuntu0.11.04.1, Copyright (c) 2000-2010 the Libav developers
built on Jun 12 2012 16:28:21 with gcc 4.5.2
configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --enable-shared --disable-static
WARNING: library configuration mismatch
libavutil configuration: --extra-version=4:0.6.6-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libfaad --enable-libdirac --enable-libfaad --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libavcodec configuration: --extra-version=4:0.6.6-1ubuntu1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libdirac --enable-libgsm --enable-libopenjpeg --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-libopenjpeg --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libfaad --enable-libdirac --enable-libfaad --enable-libmp3lame --enable-librtmp --enable-libx264 --enable-libxvid --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libavformat configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libavdevice configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libavfilter configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libswscale configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libpostproc configuration: --extra-version=4:0.6.6-0ubuntu0.11.04.1 --prefix=/usr --enable-avfilter --enable-avfilter-lavf --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-pthreads --enable-zlib --enable-libvpx --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-x11grab --enable-libdc1394 --shlibdir=/usr/lib/i686/cmov --cpu=i686 --enable-shared --disable-static --disable-ffmpeg --disable-ffplay
libavutil 50.15. 1 / 50.15. 1
libavcodec 52.72. 2 / 52.72. 2
libavformat 52.64. 2 / 52.64. 2
libavdevice 52. 2. 0 / 52. 2. 0
libavfilter 1.19. 0 / 1.19. 0
libswscale 0.11. 0 / 0.11. 0
libpostproc 51. 2. 0 / 51. 2. 0
因此，它当然是用不同的选项进行编译的，但是哪个选项是支持的yuvj420p，或者既然我知道问题“似乎”是什么，我该如何消除该错误？
编辑3：
我使用我正在使用的 Ubuntu 11 系统中的开关重新进行了编译：
./configure --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-libx264 --enable-nonfree --enable-version3 --enable-shared --enable-libv4l2 --enable-avfilter --enable-vdpau --enable-bzlib --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-pthreads --enable-zlib --disable-stripping --enable-runtime-cpudetect --enable-vaapi --enable-gpl --enable-postproc --enable-swscale --enable-libdc1394 --disable-static
应该--enable-shared是yuvj子集。
这样就完成了，所有开关都已切换，现在我运行它并得到：
[video4linux2,v4l2 @ 0x9d1d0e0] Estimating duration from bitrate, this may be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
Duration: N/A, start: 36365.493926, bitrate: 36863 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 640x480, 36863 kb/s, 10 tbr, 1000k tbn, 10 tbc
Incompatible pixel format '(null)' for codec 'flv', auto-selecting format '(null)'
Last message repeated 1 times
[flv @ 0x9d22440] Warning min_rate > 0 but min_rate != max_rate isn't recommended!
[flv @ 0x9d22440] bitrate below min bitrate
Output #0, ffm, to 'http://IP:8090/cam1.ffm':
Metadata:
creation_time : now
Stream #0:0: Video: flv1 ([0][0][0][5] / 0x5000000), yuv420p, 640x10, q=255-255, 200 kb/s, 1000k tbn, 10 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> flv)
Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
所以现在它可以运行并找到东西，但由于 ，仍然不让我使用bitrate below min bitrate。我尝试设置-b 200k，-b 600k但仍然是同样的情况。我认为这是因为 FFM 文件显示 200，但我希望它在 200。
那么现在我该如何禁用比特率检查？
我猜这就是现在的问题，说实话，我很想在这个系统上安装 Ubuntu 11.04 然后放弃它，每个新版本的软件都会让事情变得越来越困难。