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• Using ffmpeg to build a streaming server to stream static media files (broadcast behaviour)

  15 février 2018, par MiDaa

  I’ve read some online articles and SO questions, most of them are about streaming MY video to SERVER like youtube or switch.

  This is about a project of interest, here are what it should do.

  • Work on a Linux server
  • Serve media(preferably multiple format like mp4 mkv) files to client through rtp protocol maybe ?
  • Server could set a specific time to start the streaming or end it
  • Server could pause and resume the streaming(?)
  • Multiple clients connect and play the stream at same time(sounds like a basic feature)

  After some research, I found that ffmpeg is a great open-source candidate for such a project but as a newbie in this area, I’m having a tough time understanding how this whole thing work.

  As this(ffmpeg doc) states, it looks like just a one liner command. But I don’t find anything fit my feature listed above.

  Can ffmpeg be used to achieve those ? If not appriciate any suggesstion on where I should be looking at.

  EDIT :

  • Target devices : iPad,iPhone, Android phones should be able to watch the stream using a web browser(assume a modern browser)

• Why frame->pts increases by 20, rather than by 1 ?

  19 mars 2013, par user1914692

  Following the exmaples of ffmpeg : decoding_encoding.c and filtering_video.c, I process one video file taken by iPhone. The video file : .mov, video dimensions ; 480x272, video Codec : H.264/AVC, 30 frames per second, bitrate : 605 kbps.

  I first extract each frame, which is YUV.
  I convert YUV to RGB24, and process the RGB24, then write the RGB24 to a .ppm file. It shows the .ppm file is correct.

  Then I plan to encode processed RGB24 frames to a video file.
  Since MPEG does not support RGB24 picture format, I used AV_CODEC_ID_HUFFYUV.
  But the output video file (showing 18.5 MB) does not play. Movie Player on Ubuntu claims an error : Could not determine type of stream.
  I also tried it on VCL. It simply does not work, without any error information.

  My second questions is :
  For each extracted fram from the input video file, I get its pts as follows according to filtering_video.c :

  frame->pts = av_frame_get_best_effort_timestamp(frame);

  I print out each frame's pts, and find that it increases by 20, like below :

  pFrameRGB_count: 0,  frame->pts: 0
  
  pFrameRGB_count: 1,  frame->pts: 20
  
  pFrameRGB_count: 2,  frame->pts: 40
  
  pFrameRGB_count: 3,  frame->pts: 60

  Where frame is the extracted frame from the input video, and pFrameRGB_count is the count for processed frame in RGB24 form.

  Why are they wrong ?

• ffmpeg stream video file from ubuntu to youtube

  14 mars 2018, par user3010452

  I’m trying to create a stream to youtube. I could see how preview button changes into enable state. However it never actually changes from offline.
  And it gives me several error. What am I doing wrong ?

       ffmpeg -i video.flv -f flv rtmp://a.rtmp.youtube.com/live2/XXXXXX
  
  
  
  
  
    ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
  
  
        built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
        configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --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-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --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-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
        libavutil      54. 31.100 / 54. 31.100
  
        libavcodec     56. 60.100 / 56. 60.100
  
        libavformat    56. 40.101 / 56. 40.101
  
        libavdevice    56.  4.100 / 56.  4.100
  
        libavfilter     5. 40.101 /  5. 40.101
  
        libavresample   2.  1.  0 /  2.  1.  0
  
        libswscale      3.  1.101 /  3.  1.101
  
        libswresample   1.  2.101 /  1.  2.101
  
        libpostproc    53.  3.100 / 53.  3.100
  
      Input #0, flv, from 'video.flv':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          com.apple.quicktime.creationdate: 2017-07-20T21:44:12+0700
  
          com.apple.quicktime.make: Apple
  
          com.apple.quicktime.model: iPhone 6s Plus
  
          com.apple.quicktime.software: 10.3.2
  
          encoder         : Lavf57.83.100
  
        Duration: 00:01:15.24, start: 0.000000, bitrate: 4454 kb/s
  
          Stream #0:0: Video: flv1, yuv420p, 1920x1080, 200 kb/s, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc
  
          Stream #0:1: Audio: adpcm_swf, 44100 Hz, mono, s16, 176 kb/s
  
      Output #0, flv, to 'rtmp://a.rtmp.youtube.com/XXXXXX':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 0
  
          compatible_brands: qt  
  
          com.apple.quicktime.creationdate: 2017-07-20T21:44:12+0700
  
          com.apple.quicktime.make: Apple
  
          com.apple.quicktime.model: iPhone 6s Plus
  
          com.apple.quicktime.software: 10.3.2
  
          encoder         : Lavf56.40.101
  
          Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 1920x1080, q=2-31, 200 kb/s, 29.97 fps, 1k tbn, 29.97 tbc
  
          Metadata:
  
            encoder         : Lavc56.60.100 flv
  
          Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, mono, s16p
  
          Metadata:
  
            encoder         : Lavc56.60.100 libmp3lame
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (flv1 (flv) -> flv1 (flv))
  
        Stream #0:1 -> #0:1 (adpcm_swf (native) -> mp3 (libmp3lame))
  
      Press [q] to stop, [?] for help
  
      [flv @ 0x162bac0] Failed to update header with correct duration.ate=4125.4kbits/s    
  
      [flv @ 0x162bac0] Failed to update header with correct filesize.
  
      frame= 2255 fps=114 q=31.0 Lsize=   37863kB time=00:01:15.24 bitrate=4122.0kbits/s    
  
      video:37194kB audio:588kB subtitle:0kB other streams:0kB global 

  headers:0kB mixing overhead : 0.213941%