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Sur d’autres sites (5262)

  • ffmpeg : AVI to FLV conversion doubles file size

    22 septembre 2012, par weekens

    I convert AVI to FLV with ffmpeg using -sameq parameter (same quality) :

    ffmpeg -i test.avi -sameq -f flv sameq.flv

    The resulting file has the same video and audio quality as the original, but it's more than twice the original file size :

    84M sameq.flv
    
41M test.avi

    Why does it happen ?

    Transcoder output :

    ffmpeg version N-34750-g070d2d7, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Nov 12 2011 11:23:07 with gcc 4.6.1
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 24. 1 / 51. 24. 1
    
  libavcodec   53. 33. 0 / 53. 33. 0
    
  libavformat  53. 20. 0 / 53. 20. 0
    
  libavdevice  53.  4. 0 / 53.  4. 0
    
  libavfilter   2. 48. 0 /  2. 48. 0
    
  libswscale    2.  1. 0 /  2.  1. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, avi, from 'test.avi':
    
  Duration: 00:06:30.00, start: 0.000000, bitrate: 866 kb/s
    
    Stream #0:0: Video: mpeg4 (Advanced Real Time Simple Profile) (DIVX / 0x58564944), yuv420p, 400x300 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
    
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, mono, s16, 64 kb/s
    
[buffer @ 0xa247ae0] w:400 h:300 pixfmt:yuv420p tb:1/1000000 sar:1/1 sws_param:
    
Output #0, flv, to 'sameq.flv':
    
  Metadata:
    
    encoder         : Lavf53.20.0
    
    Stream #0:0: Video: flv1 ([2][0][0][0] / 0x0002), yuv420p, 400x300 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1k tbn, 25 tbc
    
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, mono, s16, 128 kb/s
    
Stream mapping:
    
  Stream #0:0 -> #0:0 (mpeg4 -> flv)
    
  Stream #0:1 -> #0:1 (mp3 -> libmp3lame)
    
Press [q] to stop, [?] for help
    
frame= 9742 fps=255 q=0.0 Lsize=   85074kB time=00:06:30.00 bitrate=1787.0kbits/s    
    
video:79163kB audio:5525kB global headers:0kB muxing overhead 0.455568%

  • How can I convince ffserver to save a locally-sourced webcam stream to a file in high resolution AND stream it in lower resolution ?

    2 novembre 2015, par Dominic Jacobssen

    We have a remote Linux machine, accessible over VPN, which has a USB webcam. We want to use this for video conferencing, but we also want to store the stream for archiving.

    Since the streaming bandwidth is limited, it makes sense to capture the stream on the same machine as the webcam and rsync that across after-the-fact, rather than trying to capture the streamed content, which is necessarily going to be poor quality.

    We’re trying to use ffmpeg and ffserver to achieve this, but with little success. Most of the articles on the internet either deal with just streaming a webcam, or rebroadcasting a remote stream. We found we had to recompile ffserver because of a missing "my_addr->sin_family = AF_INET ;" in the version of ffserver.c we had been using, since fixed in git.

    Here’s the ffserver.conf we’re trying to use :

    Port 43688
    
BindAddress 127.0.0.1
    
MaxHTTPConnections 2000
    
MaxClients 1000
    
MaxBandwidth 1000
    
CustomLog -
    
NoDaemon
    
<feed>
    
ReadOnlyFile /tmp/feed.ffm
    
FileMaxSize 20M
    
ACL allow 127.0.0.1
    
</feed>
    
<stream>
    
Feed feed.ffm
    
Format mp4
    
VideoSize qvga
    
VideoGopSize 12
    
VideoHighQuality
    
Video4MotionVector
    
VideoCodec libx264
    
VideoBitRate 100
    
VideoBufferSize 40
    
VideoFrameRate 5
    
VideoQMin 3
    
VideoQMax 31
    
AudioCodec libfaac
    
AudioBitRate 32
    
AudioChannels 2
    
AudioSampleRate 22050
    
ACL allow localhost
    
</stream>

    When we fire this up, we get the error :

    Unable to create feed file '/tmp/feed.ffm' as it is marked readonly

    Fair enough, but this is not what is implied in the docs. Changing the directive to :

    File /tmp/feed.ffm

    allows ffserver to fire up and appear to sit and wait for ffmpeg to connect to it. However, when we fire up ffmpeg with the command :

    ffmpeg -f alsa -i pulse -r 16000 -f video4linux2 -s qvga -i /dev/video0 -r 5 -f mp4 -vcodec libx264 -sameq -acodec libfaac -ab 32k http://127.0.0.1:43688/feed.ffm

    then the webcam lights up and ffserver acknowledges the connection with the messages :

    New connection: POST /feed.ffm
    
[POST] "/feed.ffm HTTP/1.1" 200 0

    but after a few seconds we get the errors :

    [mp4 @ 0x264b160] muxer does not support non seekable output
    
Could not write header for output file #0 (incorrect codec parameters ?)

    We’ve tried various other formats (mpeg, mpegts, avi) and codecs (mpeg1video, mpeg2video, mpeg4), all without success.

    Moreover, we were under the impression that ffserver could reencode input format to a lower resolution for streaming, but if the stream resolution doesn’t match the feed resolution, we get an error about the resolutions not matching.

    Has anyone ever managed to get this working correctly ? I’ve read about vlc being able to do something like this, but the vlc command lines are well nigh impenetrable.

    Thanks !

    Dominic

  • Issue in CV_FOURCC('H', '2', '6', '4')

    16 décembre 2014, par Ashwin

    I am trying to use H264 encoding type for compressing the live streaming from Camera (which is supporting the H264 codec) am getting below -
    [I am using OPENCV 3.0 beta version (latest)in windows 7 64 bit system .My camera is also supporting H264 codec (find more details below) ]
    My ffmpeg code got built with h264 lib :
    This build was compiled with the following external libraries :
    x264 20140826-git-dd79a61 http://videolan.org/developers/x264.html

    **error :**
    

    
Frame size = 1280x720
    
Could not find encoder for codec id 28: Encoder not foundERROR: Failed to write the video
    
Press any key to continue . . .

    Below is my code :

    int main(int argc, char *argv[])
    
{
    
 // QApplication a(argc, argv);
    

    
  VideoCapture cap(0); //capture webcam
    

    
  if (!cap.isOpened()) //if not successful then exit
    
  {
    
    cout &lt;&lt; "Cannot open webcam";
    
    return -1;
    
  }
    

    
  namedWindow("Camera feed", 1); //create window
    

    
  cap.set(3, 1280);
    
  cap.set(4, 720);
    

    
  double dWidth  = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get width of frames of video
    
  double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get height of frames of video    
    

    

    
  Size frameSize(static_cast<int>(dWidth), static_cast<int>(dHeight));
    

    
  cout &lt;&lt; "Frame size = " &lt;&lt; dWidth &lt;&lt; "x" &lt;&lt; dHeight &lt;&lt; endl;
    

    
  VideoWriter oVideoWriter("video.avi", CV_FOURCC('X', '2', '6', '4'), 30, frameSize);
    

    
  if(!oVideoWriter.isOpened())
    
  {
    
    cout &lt;&lt; "ERROR: Failed to write the video" &lt;&lt; endl;
    
    return -1;
    
  }
    
  while(1)
    
  {
    
    Mat frame;
    
    bool bSuccess = cap.read(frame); //read a new frame from video
    

    
    if(!bSuccess) //if unsuccessful, break loop
    
    {
    
        cout &lt;&lt; "Cannot read frame from video file" &lt;&lt; endl;
    
        break;
    
    }
    

    
    oVideoWriter.write(frame); //write the frame into the file
    
    imshow("Camera feed", frame); //show the frame in "Live Feed" window
    

    
    cout &lt;&lt; "Recording" &lt;&lt; endl;
    

    
    if (waitKey(30) == 27)
    

    
    {
    
      cout&lt;&lt; "Esc key is pressed by user" &lt;&lt; endl;
    
      break;
    
    }
    

    
  }
    
  return 0;
    
}
    
</int></int>

    Here is the proof that my camera is supporting the H264 :

    C:\Users>ffmpeg -f dshow -list_options true -i video="Logitech HD Pro Webcam C920"
    
ffmpeg version N-66116-g720c21d Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Sep  4 2014 22:09:48 with gcc 4.8.3 (GCC)
    
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-decklink --enable-zlib
    
  libavutil      54.  7.100 / 54.  7.100
    
  libavcodec     56.  1.100 / 56.  1.100
    
  libavformat    56.  4.100 / 56.  4.100
    
  libavdevice    56.  0.100 / 56.  0.100
    
  libavfilter     5.  0.103 /  5.  0.103
    
  libswscale      3.  0.100 /  3.  0.100
    
  libswresample   1.  1.100 /  1.  1.100
    
  libpostproc    53.  0.100 / 53.  0.100
    
[dshow @ 0000000002faf680] DirectShow video device options
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=bgr24  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1296 fps=2 max s=2304x1296 fps=2
    
[dshow @ 0000000002faf680]   pixel_format=yuv420p  min s=2304x1536 fps=2 max s=2304x1536 fps=2
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=mjpeg  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
[dshow @ 0000000002faf680]  Pin "Capture"
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x480 fps=5 max s=640x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x90 fps=5 max s=160x90 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=160x120 fps=5 max s=160x120 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=176x144 fps=5 max s=176x144 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x180 fps=5 max s=320x180 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=320x240 fps=5 max s=320x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=352x288 fps=5 max s=352x288 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=432x240 fps=5 max s=432x240 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=640x360 fps=5 max s=640x360 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x448 fps=5 max s=800x448 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=800x600 fps=5 max s=800x600 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=864x480 fps=5 max s=864x480 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=960x720 fps=5 max s=960x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1024x576 fps=5 max s=1024x576 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1280x720 fps=5 max s=1280x720 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1600x896 fps=5 max s=1600x896 fps=30
    
[dshow @ 0000000002faf680]   vcodec=h264  min s=1920x1080 fps=5 max s=1920x1080 fps=30
    
video=Logitech HD Pro Webcam C920: Immediate exit requested

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