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• FFMPEG video streaming error

  2 octobre 2013, par Vigo

  I have downloaded FFMPEG static builds for carrying out audio/video streaming on a LAN. A webcam captures the video and this has to be streamed. I use the following command to know the name of the video device connected.

  ffmpeg -list_devices true -f dshow -i dummy  
  

  The webcam connected is "USB Video Device".
  Next i use the following command to transmit the video.

  ffmpeg -f dshow -i video="USB Video Device" -vcodec libx264 -tune zerolatency -b 900k -f rtp rtp://10.1.0.102:1234  
  

  But it throws me the error "Could not run filter. video=USB Video Device: Input/output error" as shown below.

  

  Please let me know what is the issue here.

• ffmpeg need some quality advices

  2 octobre 2013, par xakepp35

  help! current dir: contains files in .bmp formt! I need to get *.avi at 4fps from frames i have alredy got in current forlder

  D:\WORK\MyFrames>"C:\Users\Den\Downloads\ffmpeg-latest-win32-static\ffmpeg-201 30928-git-c461265-win32-static\bin\ffmpeg.exe" -i d:\WORK\MyFrames\IMG_%4d.bmp
   -r 4 -vcodec h264 -y out.avi
  ffmpeg version N-56715-gc461265 Copyright (c) 2000-2013 the FFmpeg developers built on Sep 28 2013 18:02:00 with gcc 4.8.1 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 46.100 / 52. 46.100
  libavcodec     55. 33.101 / 55. 33.101
  libavformat    55. 18.104 / 55. 18.104
  libavdevice    55.  3.100 / 55.  3.100
  libavfilter     3. 88.100 /  3. 88.100
  libswscale      2.  5.100 /  2.  5.100
  libswresample   0. 17.103 /  0. 17.103
  libpostproc    52.  3.100 / 52.  3.100
  [image2 @ 022cfa60] Could find no file with path 'd:\WORK\MyFrames\IMG_%4d.bmp
  ' and index in the range 0-4
  d:\WORK\Serega28-3\IMG_%4d.bmp: No such file or directory
  

• convert avi to 3gp with ffmpeg

  2 octobre 2013, par jeet

  I'm trying to convert avi to 3gp, and reduce the size of frames from 800x600 to a smaller size, suitable for mobiles. What size should I use and where to set it in this command below? Please give me the new command.

  ffmpeg -i input.avi -vcodec libx264 -s qvga -b 6438912 -r 16 -acodec libvo_aacenc -ab 393216 -ar 32000 -ac 1 -y output.3gp
  

  Thanks

• php+ffmpeg add logo to video having error

  2 octobre 2013, par Patel Vilay

  I create code for add logo to video using ffmpeg.

  ffmpeg -i 1.mp4 -i a.jpg -filter_complex "overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2" outputvideo.mp4
  

  When I use this code in windows dos there is no problem and logo is added, but it give me an error when I use this with PHP.

  PHP:

  <?php
      echo "Starting ffmpeg...\n\n";
      echo shell_exec("ffmpeg -i 1.mp4 -i a.jpg -filter_complex "overlay=main_w/2-overlay_w/2:main_h/2-overlay_h/2" outputvideo.mp4");
      echo "Done.\n";
  ?>
  

  Error:

  Parse error: syntax error, unexpected 'overlay' (T_STRING) in C:\xampp\htdocs\tts\2.php on line 3
  

  How to solve this?

  Please help me.

• OpenCV won't open some videos of many videos of the same format

  2 octobre 2013, par OpenMinded

  I am using Visual Studio 2012 with OpenCV 2.4.6.

  I have 4 videos that I recorded one by one with my Nokia Lumia 920. OpenCV won't open .mp4 format from my phone by the default. So I converted all these 4 videos using Sony Vegas to .mp4 with the SAME preferences for all of them. Now the problem is that OpenCV has a problem to open two of them. The other two works like a charm with no problem. Below is the information about codec that I used (Yes, it is the same for all videos):

  

  And this is the error:

  

  Why is it so that they are the same type but only a few of them are loaded properly?