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• recive klv data from a ffmpeg multicast

  5 avril 2019, par diego

  I am trying to get the klv data from a .mpeg.

  I tried this command and it works perfectly :

  ffmpeg -i video.mpg -map data-re -codec copy -f data data.klv

  (This first command has "data-re" which just works on linux, but it is the only way I found to get the .klv I need)

  Now I would like to open two CMD and transfer it by multicast, how could I do this ? i tried many comands like next ones, but I do not get the same .klv

  sender : ffmpeg -i video.mpeg -c copy -f mpegts udp://239.1.1.1:49410

  receiver : ffmpeg -i udp://239.1.1.1:49410 -map 0 -codec copy -f data data.klv

  I am new with ffmpeg and I do not know exactly what I need to change to get exactly whay I get in the first command.

  Thanks

• How to send continuous stream of frames to server most efficiently

  27 avril 2019, par Duthopi

  I am trying to send frames from a local camera (raspberry pi camera, but could also be my laptop’s webcam) to a Google cloud instance, on which I am running AI processing of the frames.

  I am managing to send frames captured through opencv via http (i.e. tcp ??) and receiving them on a flask server. When the flask server is running locally I can get good fps (50+ fps for image size 640x480), however once I send the frames to a flask app on the google instance the fps drop drastically to 5fps.

  How I currently send frames :

  while True:
  
          frame = vs.read() #Separate thread, using cv2 to get the frame
  
  
  
          ret, jpeg = cv2.imencode('.jpg', frame)
  
          imgdata = jpeg.tobytes()
  
          response = requests.post(
  
              url='http://<ip address="address" of="of" google="google" instance="instance">:<port>',
  
              data= imgdata,
  
              headers={'content-type':'image/jpeg'},
  
              )
  
  </port></ip>

  I see two problems with this :
  1 - using tcp means I am slower than udp protocol, however udp is limited in byte size. Correct me if I am wrong, but it seems very complex to send truncated frames and put them back together on the server..
  2 - Even if I had udp working, there is no compression of frames, so I will never reach an efficient transfer

  I expect the answer to be something like using ffmpeg, but so far I only figured out how to stream frames on a local port with ffmpeg, I do not know if it is possible to send frames to a remote server.

  Any recommendations on the best way forward ?

• Can ffmpeg copy metadata/ID3 from FLAC to MP3 ?

  9 avril 2019, par krypterro

  I have a bit of Python code that loops through audio files, finds .FLAC files, and then uses the Python subcommand to run ffmpeg. It works. The audio is fine, but even though I see the metadata in the shell, it doesn’t transfer the data to the ID3 tags in the MP3, and I am using the example found in the previous post here. Here’s the command :

  cmd = 'ffmpeg -y -i "' + src + '" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "' + dst + '"'

  Which works out to :

  ffmpeg -y -i "source.flac" -codec:a libmp3lame -q:a 0 -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "destination.mp3"

  And here is the log dump :

  /usr/local/bin/python3.7 /home/krypterro/PycharmProjects/mediaman/RipFLAC.py
  
  1 Music Files Found
  
  2019-04-09 14:32:47.758 | INFO     | __main__:main:31 - Start of program
  
  2019-04-09 14:32:48.110 | DEBUG    | __main__:ripmp3:206 - Running Command: ffmpeg -y -i "/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac" -acodec libmp3lame -ab 192000 "/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3"
  
  ffmpeg version 3.4.4-0ubuntu0.18.04.1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    WARNING: library configuration mismatch
  
    avcodec     configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, flac, from '/home/krypterro/audio/music_in/Visions/01-grimes-laughing_and_not_being_normal.flac':
  
    Metadata:
  
      ARTIST          : Grimes
  
      TITLE           : Laughing And Not Being Normal
  
      ALBUM           : Art Angels
  
      DATE            : 2015
  
      track           : 1
  
      GENRE           : Electronic
  
      disc            : 1
  
      TOTALDISCS      : 1
  
      TOTALTRACKS     : 15
  
      LANGUAGE        : English
  
      RIP DATE        : 2015-12-12
  
      RETAIL DATE     : 2015-00-00
  
      MEDIA           : CD
  
      ENCODER         : FLAC 1.2.1 -8 -V
  
      RIPPING TOOL    : EAC 1.0 Beta 3
  
      RELEASE TYPE    : Retail
  
      ORGANIZATION    : 4AD
  
      CATALOG         : CAD3535CD
  
    Duration: 00:01:47.51, start: 0.000000, bitrate: 743 kb/s
  
      Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (flac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp3, to '/home/krypterro/audio/music_out/Visions/01-grimes-laughing_and_not_being_normal.mp3':
  
    Metadata:
  
      TPE1            : Grimes
  
      TIT2            : Laughing And Not Being Normal
  
      TALB            : Art Angels
  
      TDRC            : 2015
  
      TRCK            : 1
  
      TCON            : Electronic
  
      TPOS            : 1
  
      TOTALDISCS      : 1
  
      TOTALTRACKS     : 15
  
      TLAN            : English
  
      RIP DATE        : 2015-12-12
  
      RETAIL DATE     : 2015-00-00
  
      MEDIA           : CD
  
      CATALOG         : CAD3535CD
  
      RIPPING TOOL    : EAC 1.0 Beta 3
  
      RELEASE TYPE    : Retail
  
      ORGANIZATION    : 4AD
  
      TSSE            : Lavf57.83.100
  
      Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc57.107.100 libmp3lame
  
  size=    2522kB time=00:01:47.52 bitrate= 192.1kbits/s speed=  41x    
  
  video:0kB audio:2521kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.042501%
  
  2019-04-09 14:32:50.811 | INFO     | __main__:main:73 - End of program
  
  
  
  Process finished with exit code 0