ffserver保留原始流大小

Question

Hope you guys will help me, because I have got stuck and can't find solution for this problem by myself. I am trying to stream video from webcam to users using ffmpeg+ffserver. But I have faced with a problem:

ffmpeg gets stream from camera and pushes it to feed of ffserver:
ffmpeg -rtsp_transport tcp -i rtsp://admin:admin@192.168.10.76:80 -y -vcodec libvpx http://127.0.0.1:8090/1.ffm

ffserver stream options:

<Stream 1.webm>
Feed 1.ffm
Format webm
NoAudio
#VideoCodec libvpx
#VideoSize 480x320
VideoFrameRate 24
AVOptionVideo flags +global_header
AVOptionVideo cpu-used 0
AVOptionVideo qmin 1
AVOptionVideo qmax 31
AVOptionVideo quality good
PreRoll 0
StartSendOnKey
VideoBitRate 128
</Stream>

(note, videoSize option is commented). But even with default VideoSize (160x128), ffserver doesn't respond for each request. Browser always gets:

HTTP/1.0 200 OK
Pragma: no-cache
Content-Type: video/webm

But sometimes video content is not sent.

If I uncomment VideoSize option - the same problem but much less successfull requests comparing with default video size.

ffserver log looks regular with no errors. But as you can see that sometimes it sends only headers to client:

Thu Nov 27 12:49:11 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 459
Thu Nov 27 12:49:25 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 459
Thu Nov 27 12:49:36 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 459
Thu Nov 27 12:50:52 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 459
Thu Nov 27 12:53:54 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 459
Thu Nov 27 13:30:19 2014 127.0.0.1 - - [GET] "/1.ffm HTTP/1.1" 200 4175
Thu Nov 27 13:30:34 2014 127.0.0.1 - - [GET] "/1.webm HTTP/1.1" 200 385731
Thu Nov 27 13:30:34 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 458752
Thu Nov 27 13:30:36 2014 127.0.0.1 - - [GET] "/1.ffm HTTP/1.1" 200 4175
Thu Nov 27 13:30:58 2014 127.0.0.1 - - [GET] "/1.webm HTTP/1.1" 200 493
Thu Nov 27 13:30:58 2014 127.0.0.1 - - [POST] "/1.ffm HTTP/1.1" 200 622592

Does anybody know what could it be? Actually I need to save original VideoSize for stream. I am trying to override ffserver stream options with ffmpeg using the command (passing the same parameters as in ffserver's stream):

ffmpeg -re -override_ffserver -rtsp_transport tcp -i rtsp://admin:admin@192.168.10.76:80 -an -r 24 -qmin 1 -qmax 31 -cpu-used 0 -quality good -flags:v +global_header -b:v 128 -vcodec libvpx -f webm -y http://127.0.0.1:8090/1.ffm

But at the momment I still have error message 'Output file is empty, nothing was encoded'. Here is ffmpeg's output:

ffmpeg version 2.4.2 Copyright (c) 2000-2014 the FFmpeg developers
  built on Oct  6 2014 17:33:05 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/opt/ffmpeg --libdir=/opt/ffmpeg/lib/ --enable-shared --enable-avresample --disable-stripping --enable-gpl --enable-version3 --enable-runtime-cpudetect --build-suffix=.ffmpeg --enable-postproc --enable-x11grab --enable-libcdio --enable-vaapi --enable-vdpau --enable-bzlib --enable-gnutls --enable-libgsm --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libfaac --enable-libvo-aacenc --enable-nonfree --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfdk_aac --enable-libopus --enable-pthreads --enable-zlib --enable-libvpx --enable-libfreetype --enable-libpulse --enable-debug=3
  libavutil      54.  7.100 / 54.  7.100
  libavcodec     56.  1.100 / 56.  1.100
  libavformat    56.  4.101 / 56.  4.101
  libavdevice    56.  0.100 / 56.  0.100
  libavfilter     5.  1.100 /  5.  1.100
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  0.100 /  3.  0.100
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  0.100 / 53.  0.100
Guessed Channel Layout for  Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://admin:admin@192.168.10.76:80':
  Metadata:
    title           : RTSP Session/2.0
  Duration: N/A, start: 0.000000, bitrate: 128 kb/s
    Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 100 tbr, 90k tbn, 50 tbc
    Stream #0:1: Audio: pcm_alaw, 16000 Hz, 1 channels, s16, 128 kb/s
[swscaler @ 0x197f7a0] deprecated pixel format used, make sure you did set range correctly
[libvpx @ 0x1a0c080] Bitrate 128 is extremely low, maybe you mean 128k
[libvpx @ 0x1a0c080] v1.3.0
The bitrate parameter is set too low. It takes bits/s as argument, not kbits/s
Output #0, webm, to 'http://127.0.0.1:8090/1.ffm':
  Metadata:
    title           : RTSP Session/2.0
    encoder         : Lavf56.4.101
    Stream #0:0: Video: vp8 (libvpx), yuv420p, 480x320 [SAR 32:27 DAR 16:9], q=1-31, 0 kb/s, 24 fps, 1k tbn, 24 tbc
    Metadata:
      encoder         : Lavc56.1.100 libvpx
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> vp8 (libvpx))
Press [q] to stop, [?] for help
frame=   33 fps= 22 q=0.0 size=       0kB time=00:00:00.00 bitrate=N/A dup=0 droframe=   43 fps= 22 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A dup=0 drop=1    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
Received signal 2: terminating.

Thanks in advance.

Answer 1

As far as I understand you want to:

1. Get the stream from an IP camera.
2. Encode the stream using ffmpeg with vp8 codec preserving the original video resolution.
3. Send it to ffserver.
4. Stream it further.

To do this you need to:

1. create ffserver.config file
2. launch ffserver
3. launch ffmpeg console script

Your case requires:

1. In config file uncomment video codec and remove bit rate

2. After launching the server type in ffmpeg command:

   ffmpeg -i rtsp://admin:admin@192.168.10.76:80 -c:v libvpx -b:v 800 -an htt_p://xxx.xx.xxx.xxx:SERVER_HTTP_PORT/feed1.ffm

[remove '_' from http]

Please note that if your camera supports more than one resolution, ffmpeg will choose the worst if you don't specify which one you need. You can check supported resolution in web cams by typing ffmpeg -f v4l2 -list_formats all -i /dev/video0 . This should also work for an ip cam if you replace /dev/video0 with rtsp://admin:admin@192.168.10.76:80 .

Also remember that video bit rate (-b:v) depends on the frame size.