Sur d’autres sites (4649)

• Seeking with the activeX VLC plugin has a bad response rate

  24 juin 2017, par Vitalis Hommel

  I am using axVLCPlugin.input.time = pos; where pos is the new time to browse through a video clip in small resolution (240p) in a VLC activeX part of my program using a slider, which updates pos.

  On an older laptop this worked flawlessly, with no delay. On my new laptop, this works only with significant delay, meaning that once I enter a new position, it takes about 1 second to show this position of the video on screen in the VLC activeX plugin. Previously it was instant.

  Is this

  1. a VLC issue(2.2.6 umbrella) ?
  2. a Visual Studio issue(VS 2017) ?
  3. a video encoding issue(ffmpeg version N-86482-gbc40674 - ffmpeg -i inputfile.extension output.mp4) ?
  4. a video codec issue ?

  EDIT : fortunately I found that the activex-plugin has an output. This is what it gives me : https://pastebin.com/GEKb22Gg - still unclear what that means

  How to track down the cause and solve it ?

• ffmpeg and streaming to youtube displaying logotype and webcamera

  7 juin 2017, par DmitrySemenov

  ➜  tmp ffmpeg -version 
  
  ffmpeg version 3.1.7 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 6.3.1 (GCC) 20161221 (Red Hat 6.3.1-1)
  
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld' --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --extra-cflags=-I/usr/include/nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
  libavutil      55. 28.100 / 55. 28.100
  
  libavcodec     57. 48.101 / 57. 48.101
  
  libavformat    57. 41.100 / 57. 41.100
  
  libavdevice    57.  0.101 / 57.  0.101
  
  libavfilter     6. 47.100 /  6. 47.100
  
  libavresample   3.  0.  0 /  3.  0.  0
  
  libswscale      4.  1.100 /  4.  1.100
  
  libswresample   2.  1.100 /  2.  1.100
  
  libpostproc    54.  0.100 / 54.  0.100

  I’m streaming to youtube with the following settings

  ffmpeg \
  
  -f x11grab -video_size 3840x2160 -framerate 30 -i :1.0 \
  
  -f v4l2 -video_size 320x240 -framerate 30 -i /dev/video0 \
  
  -f alsa -ac 2 -i pulse -i logo.png -filter_complex \
  
  "[0:v]scale=1920:-1,setpts=PTS-STARTPTS[bg]; \
  
   [1:v]scale=120:-1,setpts=PTS-STARTPTS[fg]; \
  
   [bg][fg]overlay=W-w-10:10[bg2]; \
  
   [bg2][3:v]overlay=W-w-10:H-h-10,format=yuv420p[out]" \
  
  -map "[out]" -map 2:a -c:v libx264 -preset veryfast \
  
  -maxrate 9000k -bufsize 12000k -c:a aac -b:a 160k -ar 44100 -b:a 128k \
  
  -f flv rtmp://a.rtmp.youtube.com/live2/TOKEN

  

  I’m getting that huge black screen that cuts a lot of visible screen canvas. How do I get rid of it keeping webcamera preview on top and logo at the bottom ?

  This is what I see in console

  https://gist.github.com/dmitry-saritasa/cc85ba6650d9bd50b28a61624711b96a

  as you can see I only get 6-9fps while I expect 24+ (per settings ?)

  frame=  101 fps=6.4 q=23.0 size=    1669kB time=00:00:11.37 bitrate=1202.2kbits/s dup=0 drop=4 speed=0.718x    
  
  frame=  105 fps=6.4 q=27.0 size=    1866kB time=00:00:12.09 bitrate=1263.7kbits/s dup=0 drop=4 speed=0.74x    
  
  frame=  107 fps=6.4 q=28.0 size=    1871kB time=00:00:12.32 bitrate=1243.0kbits/s dup=0 drop=4 speed=0.732x    
  
  frame=  111 fps=6.4 q=26.0 size=    1879kB time=00:00:12.79 bitrate=1203.4kbits/s dup=0 drop=4 speed=0.737x    

  ---

  Questions

  1. How to get rid of the top black area ? So that I can screen share my full display ?
  2. How to increase fps ?

• How to use codec type properly in NPM

  3 juillet 2017, par shamaleyte

  Trying to use ’-acodec libopus’ in my npm project as I use in the command line like in the following format ;

  ffmpeg -acodec libopus -i 1.webm 1.wav

  This works perfectly ! But I would like to make it possible in my NPM project.

  How can I set the parameters ?
  This is what I have , but not working. The output file is broken in a way that some of the frames of the audio file are missing. It is like there is sound and then there is not. And vice versa.

  var proc = new ffmpeg({
  
          source: file,
  
          nolog: false       
  
      });
  
  
  
  
  
  format = "opus"; // or could be wav as well!   
  
  
  
  
  
      proc.addOptions([
  
          '-f ' + format,          
  
          '-acodec libopus',
  
          '-vn'
  
      ]);

  The purpose is to take audio file from the video file seamlessly.

  Without the codec libopus, I get the following errors in the command prompt, so I assume I should handle the same issue in my NPM project as well.

  [opus @ 00000000006d4520] LBRR frames is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
  
  
  
  
  
  [opus @ 00000000006d4520] Error decoding a SILK frame.
  
  
  
  [opus @ 00000000006d4520] Error decoding an Opus frame.

  My library is up to date, I just need to use the codec libopus properly.
  Any suggestions ?

   \node-js>ffmpeg -version
  
   ffmpeg version N-86175-g64ea4d1 Copyright (c) 2000-2017 the FFmpeg 
  
   developers
  
   built with gcc 6.3.0 (GCC)
  
  
  
  Output in command line;
  
  xtranscribe transcodeWatson: file : ./data/that/2.webm
  
  progress 62.625273103421605%
  
  progress 100.01224534515762%
  
  SAVED - transcodeWatson : .mp3
  
  out of transcode!
  
  fileSizeInBytes  : 16284033