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• ffmpeg : capture two screens simultaneously, save as two separate files

  9 janvier 2017, par wetjosh

  Is this possible ? Here is my working single file solution. How can I modify it to save two separate files instead ?

  ffmpeg \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 1 \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 2 \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 \
  
    -filter_complex \
  
      "nullsrc=size=2880x900 [background]; \
  
      [0:v] setpts=PTS-STARTPTS, scale=1440x900 [left]; \
  
      [1:v] setpts=PTS-STARTPTS, scale=1440x900 [right]; \
  
      [background][left] overlay=shortest=1 [background+left]; \
  
      [background+left][right] overlay=shortest=1:x=1440 [left+right]" \
  
    -map [left+right] out.mov

  I’ve tried removing the filter complex. I’ve tried adding two output files. I’ve tried various combinations of mapping. The following is the closest I’ve gotten to making it work. It creates two files, but both contain only the second stream (-i 2).

  ffmpeg \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 1 \
  
  -f avfoundation -pix_fmt uyvy422 -s 1440x900 -i 2 \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 out1.mov \
  
  -pix_fmt yuv420p -r 30 -preset ultrafast -b:v 5000k -t 15 out2.mov

• ffmpeg won't save the file when executed from a php page

  6 septembre 2015, par Tayax

  I wrote few lines of codes today to create an video from an image with ffmpeg.

  the command works well directly on my server and the file is saved at the good place, but when running it from PHP, the process goes, but the file won’t save for some reason.

  Here is the code I use :

  $ffmpegcmd= "/usr/bin/ffmpeg -loop 1 -y -i /home/mysite/www/forwork/simpletext.jpg -c:v libx264 -t 30 -pix_fmt yuv420p /home/mysite/www/forwork/movie.avi 2>&1";
  
  exec($ffmpegcmd, $output);  
  
  print_r($output);

  And here is the answer I get :

  Array ( [0] => ffmpeg version git-2015-09-06-db18b3d Copyright (c) 2000-2015 the FFmpeg developers 
  
  [1] => built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16) 
  
  [2] => configuration: --prefix=/usr/ffmpeg_build --extra-cflags=-I/usr/ffmpeg_build/include --extra-ldflags=-L/usr/ffmpeg_build/lib --bindir=/usr/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 
  
  [3] => libavutil 55. 0.100 / 55. 0.100 
  
  [4] => libavcodec 57. 0.100 / 57. 0.100 
  
  [5] => libavformat 57. 0.100 / 57. 0.100 
  
  [6] => libavdevice 57. 0.100 / 57. 0.100 
  
  [7] => libavfilter 6. 0.100 / 6. 0.100 
  
  [8] => libswscale 4. 0.100 / 4. 0.100 
  
  [9] => libswresample 2. 0.100 / 2. 0.100 
  
  [10] => libpostproc 54. 0.100 / 54. 0.100 
  
  [11] => Input #0, image2, from '/home/mysite/www/forwork/simpletext.jpg': 
  
  [12] => Duration: 00:00:00.04, start: 0.000000, bitrate: 10414 kb/s 
  
  [13] => Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc 
  
  [14] => /home/mysite/www/forwork/movie.avi: Permission denied )

  I chmod the forwork directory to 755 but it won’t change anything.

  help troubleshooting this would be greatly appreciate. Thanks

• ffmpeg can play video but not a stream containing the same data

  21 mai 2017, par Robbsen

  This is my first time encountering video codecs/video streaming.

  I am receiving raw h.264 packets over TCP. When I connect to the socket, listen to it and simply save the received data to a file, I am able to play it back using

  ffplay data.h264

  However, when I try to directly play it from the stream without saving it, using

  ffplay tcp://addr:port

  all I get is the error

  Invalid data found when processing input

  Why is that ?