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• Writing numpy arrays using cv2 VideoWriter

  8 juillet 2015, par JustInTime

  I have a problem with writing a toy example video using opencv2.3.1 VideoWriter, here is how I do it :

  writer = cv2.VideoWriter('test1.avi',cv.CV_FOURCC('P','I','M','1'),25,(640,480))
  
  for i in range(1000):
  
      x = np.random.randint(10,size=(480,640)).astype('uint8')
  
      writer.write(x)
  
  #del writer (with or without tested)

  I tried every possible combination resulting with a 0 bytes file if the extension was mpg, and 5.5kb if it was avi. I should say that some pointed out that I should build the ffmpeg library from source and not apt-get it. Well I did that on a fresh machine based on the help of this site http://vinayhacks.blogspot.com/2011/11/installing-opencv-231-with-ffmpeg-on-64.html. which also presented an error while compiling opencv(the error was related to ffmpeg). Now I am really out of ideas, How to generate a video using OPENCV ?

  Thanks in advance

• VideoCapture not working in Python (Win 8.1 64 bit)

  3 mars 2014, par Horizon

  import cv2
  
  capture = cv2.VideoCapture("slow.avi")
  
  while not capture.isOpened():
  
    capture = cv2.VideoCapture("slow.avi")
  
    cv2.waitKey(1000)
  
    print "Wait for the header"

  I tried a lot of different video files(flv,wmv) but I couldn't open any video file.I followed http://stackoverflow.com/a/11703998 directions and copied files in OpenCV\sources\3rdparty\ffmpeg directory to C :\Python27\ directory but not working

• FFMPEG options for video streaming

  26 février 2014, par YorgZ

  I am trying to use ffmpeg to stream video using ffserver. You will find below the ffserver1.conf file, and the log output from the ffmpeg command.

  One of the errors references presets, and everytime I try to use presets I get the error "File not found, even after copying all the preset files in the current directory.

  Thanks for the help.

  YorgZ

  FFSERVER CONF
  
  
  
  YorgZ-Macbook$cat ffserver1.conf
  
  Port 8090
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 4000
  
  CustomLog -
  
  
  
  
  
  <feed>
  
        File feed1.ffm
  
        FileMaxSize 1G
  
        ACL allow 127.0.0.1
  
        ACL allow localhost
  
        ACL allow 10.0.0.0 10.0.255.255
  
  </feed>
  
  
  
  <stream>
  
      Feed feed1.ffm
  
      Format mp4
  
      VideoFrameRate  29.97
  
      VideoBitRate    500
  
      VideoSize   640x352
  
  </stream>
  
  
  
  <stream>
  
      Format status
  
      ACL allow localhost
  
      ACL allow 10.0.0.0 10.0.255.255
  
  </stream>
  
  YorgZ-Macbook$
  
  
  
  FFMPEG COMMAND AND LOG 
  
  
  
   YorgZ-Macbook$./ffmpeg -loglevel debug -i TestStream.mp4  -codec:v libx264 -b:v 500k  -vf "scale=640:352" -r 29.97 -codec:a aac -b:a 128k http://127.0.0.1:8090/feed1.ffm
  
  
  
      ffmpeg version 2.1.3-tessus Copyright (c) 2000-2013 the FFmpeg developers
  
        built on Jan 16 2014 13:50:59 with llvm-gcc 4.2.1 (LLVM build 2336.1.00)
  
        configuration: --prefix=/Users/tessus/data/ext/ffmpeg/sw --as=yasm --extra-version=tessus --disable-shared --enable-static --disable-ffplay --enable-gpl --enable-pthreads --enable-postproc --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-libspeex --enable-bzlib --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libxavs --enable-version3 --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvpx --enable-libgsm --enable-libopus --enable-fontconfig --enable-libfreetype --enable-libass --enable-libbluray --enable-filters --enable-runtime-cpudetect
  
        libavutil      52. 48.101 / 52. 48.101
  
        libavcodec     55. 39.101 / 55. 39.101
  
        libavformat    55. 19.104 / 55. 19.104
  
        libavdevice    55.  5.100 / 55.  5.100
  
        libavfilter     3. 90.100 /  3. 90.100
  
        libswscale      2.  5.101 /  2.  5.101
  
        libswresample   0. 17.104 /  0. 17.104
  
        libpostproc    52.  3.100 / 52.  3.100
  
      Splitting the commandline.
  
      Reading option &#39;-loglevel&#39; ... matched as option &#39;loglevel&#39; (set logging level) with argument &#39;debug&#39;.
  
      Reading option &#39;-i&#39; ... matched as input file with argument &#39;TestStream.mp4&#39;.
  
      Reading option &#39;-codec:v&#39; ... matched as option &#39;codec&#39; (codec name) with argument &#39;libx264&#39;.
  
      Reading option &#39;-b:v&#39; ... matched as option &#39;b&#39; (video bitrate (please use -b:v)) with argument &#39;500k&#39;.
  
      Reading option &#39;-vf&#39; ... matched as option &#39;vf&#39; (set video filters) with argument &#39;scale=640:352&#39;.
  
      Reading option &#39;-r&#39; ... matched as option &#39;r&#39; (set frame rate (Hz value, fraction or abbreviation)) with argument &#39;29.97&#39;.
  
      Reading option &#39;-codec:a&#39; ... matched as option &#39;codec&#39; (codec name) with argument &#39;aac&#39;.
  
      Reading option &#39;-b:a&#39; ... matched as option &#39;b&#39; (video bitrate (please use -b:v)) with argument &#39;128k&#39;.
  
      Reading option &#39;http://127.0.0.1:8090/feed1.ffm&#39; ... matched as output file.
  
      Finished splitting the commandline.
  
      Parsing a group of options: global .
  
      Applying option loglevel (set logging level) with argument debug.
  
      Successfully parsed a group of options.
  
      Parsing a group of options: input file TestStream.mp4.
  
      Successfully parsed a group of options.
  
      Opening an input file: TestStream.mp4.
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10201a200] Format mov,mp4,m4a,3gp,3g2,mj2 probed with size=2048 and score=100
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10201a200] ISO: File Type Major Brand: mp42
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10201a200] File position before avformat_find_stream_info() is 33783
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10201a200] All info found
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0x10201a200] File position after avformat_find_stream_info() is 64138
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#39;TestStream.mp4&#39;:
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 0
  
          compatible_brands: isommp42
  
          creation_time   : 2014-02-17 10:17:06
  
        Duration: 00:01:40.10, start: 0.000000, bitrate: 582 kb/s
  
          Stream #0:0(und), 15, 1/30000: Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 1001/60000, 483 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
          Stream #0:1(und), 1, 1/44100: Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)
  
          Metadata:
  
            creation_time   : 2014-02-17 10:17:06
  
            handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
      Successfully opened the file.
  
      Parsing a group of options: output file http://127.0.0.1:8090/feed1.ffm.
  
      Applying option codec:v (codec name) with argument libx264.
  
      Applying option b:v (video bitrate (please use -b:v)) with argument 500k.
  
      Applying option vf (set video filters) with argument scale=640:352.
  
      Applying option r (set frame rate (Hz value, fraction or abbreviation)) with argument 29.97.
  
      Applying option codec:a (codec name) with argument aac.
  
      Applying option b:a (video bitrate (please use -b:v)) with argument 128k.
  
      Successfully parsed a group of options.
  
      Opening an output file: http://127.0.0.1:8090/feed1.ffm.
  
      [ffm @ 0x102037200] Format ffm probed with size=2048 and score=101
  
      [AVIOContext @ 0x101d04fe0] Statistics: 4096 bytes read, 0 seeks
  
      Mon Feb 24 11:53:05 2014 127.0.0.1 - - [GET] "/feed1.ffm HTTP/1.1" 200 4175
  
      Successfully opened the file.
  
      detected 8 logical cores
  
      [graph 0 input from stream 0:1 @ 0x101d05a20] Setting &#39;time_base&#39; to value &#39;1/44100&#39;
  
      [graph 0 input from stream 0:1 @ 0x101d05a20] Setting &#39;sample_rate&#39; to value &#39;44100&#39;
  
      [graph 0 input from stream 0:1 @ 0x101d05a20] Setting &#39;sample_fmt&#39; to value &#39;fltp&#39;
  
      [graph 0 input from stream 0:1 @ 0x101d05a20] Setting &#39;channel_layout&#39; to value &#39;0x3&#39;
  
      [graph 0 input from stream 0:1 @ 0x101d05a20] tb:1/44100 samplefmt:fltp samplerate:44100 chlayout:0x3
  
      [audio format for output stream 0:0 @ 0x102d004e0] Setting &#39;sample_fmts&#39; to value &#39;s16&#39;
  
      [audio format for output stream 0:0 @ 0x102d004e0] Setting &#39;sample_rates&#39; to value &#39;22050&#39;
  
      [audio format for output stream 0:0 @ 0x102d004e0] Setting &#39;channel_layouts&#39; to value &#39;0x4&#39;
  
      [audio format for output stream 0:0 @ 0x102d004e0] auto-inserting filter &#39;auto-inserted resampler 0&#39; between the filter &#39;Parsed_anull_0&#39; and the filter &#39;audio format for output stream 0:0&#39;
  
      [AVFilterGraph @ 0x101d03ea0] query_formats: 4 queried, 6 merged, 3 already done, 0 delayed
  
      0.500000 0.500000 
  
      [auto-inserted resampler 0 @ 0x102d00ca0] ch:2 chl:stereo fmt:fltp r:44100Hz -> ch:1 chl:mono fmt:s16 r:22050Hz
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;video_size&#39; to value &#39;640x360&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;pix_fmt&#39; to value &#39;0&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;time_base&#39; to value &#39;1/30000&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;pixel_aspect&#39; to value &#39;1/1&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;sws_param&#39; to value &#39;flags=2&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] Setting &#39;frame_rate&#39; to value &#39;30000/1001&#39;
  
      [graph 1 input from stream 0:0 @ 0x103b003a0] w:640 h:360 pixfmt:yuv420p tb:1/30000 fr:30000/1001 sar:1/1 sws_param:flags=2
  
      [scaler for output stream 0:1 @ 0x103b00900] Setting &#39;w&#39; to value &#39;640&#39;
  
      [scaler for output stream 0:1 @ 0x103b00900] Setting &#39;h&#39; to value &#39;352&#39;
  
      [scaler for output stream 0:1 @ 0x103b00900] Setting &#39;flags&#39; to value &#39;0x4&#39;
  
      [scaler for output stream 0:1 @ 0x103b00900] w:640 h:352 flags:&#39;0x4&#39; interl:0
  
      [format @ 0x103b00dc0] compat: called with args=[yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16]
  
      [format @ 0x103b00dc0] Setting &#39;pix_fmts&#39; to value &#39;yuv420p|yuvj420p|yuv422p|yuvj422p|yuv444p|yuvj444p|nv12|nv16&#39;
  
      [AVFilterGraph @ 0x102d00fc0] query_formats: 5 queried, 4 merged, 0 already done, 0 delayed
  
      [scaler for output stream 0:1 @ 0x103b00900] w:640 h:360 fmt:yuv420p sar:1/1 -> w:640 h:352 fmt:yuv420p sar:44/45 flags:0x4
  
      [libx264 @ 0x102049800] broken ffmpeg default settings detected
  
      [libx264 @ 0x102049800] use an encoding preset (e.g. -vpre medium)
  
      [libx264 @ 0x102049800] preset usage: -vpre <speed> -vpre <profile>
  
      [libx264 @ 0x102049800] speed presets are listed in x264 --help
  
      [libx264 @ 0x102049800] profile is optional; x264 defaults to high
  
      Output #0, ffm, to &#39;http://127.0.0.1:8090/feed1.ffm&#39;:
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 0
  
          compatible_brands: isommp42
  
          creation_time   : now
  
          Stream #0:0(und), 0, 1/1000000: Audio: aac (libvo_aacenc), 22050 Hz, mono, s16, 128 kb/s (default)
  
          Metadata:
  
            creation_time   : 2014-02-17 10:17:06
  
            handler_name    : IsoMedia File Produced by Google, 5-11-2011
  
          Stream #0:1(und), 0, 1/1000000: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 640x352 [SAR 44:45 DAR 16:9], 1001/30000, q=2-31, 500 kb/s, 1000k tbn, 29.97 tbc (default)
  
          Metadata:
  
            handler_name    : VideoHandler
  
      Stream mapping:
  
        Stream #0:1 -> #0:0 (aac -> libvo_aacenc)
  
        Stream #0:0 -> #0:1 (h264 -> libx264)
  
      Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height
  
      [AVIOContext @ 0x101d04fe0] Statistics: 0 seeks, 0 writeouts
  
      [AVIOContext @ 0x101d03fa0] Statistics: 65536 bytes read, 0 seeks
  
      Mon Feb 24 11:53:05 2014 127.0.0.1 - - [POST] "/feed1.ffm HTTP/1.1" 200 0
  
      YorgZ-Macbook$
  
  </profile></speed>