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• Trim off first N samples from audio file using SoX / FFmpeg etc

  3 octobre 2016, par Vasyl Shumskyi

  Is there a way to trim off first N samples from audio file using SoX / FFmpeg or the likes of?

• ffmpeg aliased jpeg input in overlay

  3 octobre 2016, par VacH

  I have to overlay a video with 1 jpeg image (various sizes) during x seconds and in the result the image appears aliased. I searched a lot but i didn't found which parameters to tune to have a render without aliasing. Can you help me?

  Thanks in advance,

  This is my command:

  ffmpeg -y -i videosource.mp4 -loop 1 -i 640x480.jpg \
      -filter_complex "[1:v] pad=1280:720:(1280- iw)/2:(720- ih)/2 [o1v]; [0:v][o1v] overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,0,10)':format=yuv420 [V]" \
      -map "[V]" -q:v 2 -map 0:a  -c:a copy -crf 1 -shortest output.mp4
  

  Input image:

  

  The pixelated result (open the second file to see it pixelated):

  

• Invalid data found when processing input using FFmpeg for extracting video thumbnail

  3 octobre 2016, par Simer

  I am using below command to extract thumbnail from

  'C:\ffmpeg\bin\ffmpeg -i '.$server_public_path.'\frontend\videos\gallery\user_'.$logged_in_user_id.'\\' .$video_name.' -ss 00:00:30.435 -vframes 2 -flags +global_header '.$server_public_path.'\frontend\videos\gallery\user_'.$logged_in_user_id.'\\thumbnails\\'.$video_name;
  

  where $server_public_path is absolute path of my project. Above command working fine when I used it on some other path and video.

  Below is the error I am getting:

  [0] => ffmpeg version N-81784-g92de2c2 Copyright (c) 2000-2016 the FFmpeg developers
      [1] =>   built with gcc 5.4.0 (GCC)
      [2] =>   configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-dxva2 --enable-libmfx
   --enable-nvenc --enable-avisynth --enable-bzlib --enable-libebur128 --enable-fontconfig --enable-frei0r
   --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca
   --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
   --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus
   --enable-librtmp --enable-libschroedinger --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora
   --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack
   --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg
   --enable-lzma --enable-decklink --enable-zlib
      [3] =>   libavutil      55. 30.100 / 55. 30.100
      [4] =>   libavcodec     57. 58.100 / 57. 58.100
      [5] =>   libavformat    57. 51.100 / 57. 51.100
      [6] =>   libavdevice    57.  0.102 / 57.  0.102
      [7] =>   libavfilter     6. 63.100 /  6. 63.100
      [8] =>   libswscale      4.  1.100 /  4.  1.100
      [9] =>   libswresample   2.  2.100 /  2.  2.100
      [10] =>   libpostproc    54.  0.100 / 54.  0.100
      [11] => [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000050a400] Format mov,mp4,m4a,3gp,3g2,mj2 detected only
   with low score of 1, misdetection possible!
      [12] => [mov,mp4,m4a,3gp,3g2,mj2 @ 000000000050a400] moov atom not found
      [13] => D:\wamp\www\gillie\public\frontend\videos\gallery\user_1\SampleVideo_1280x720_10mb__1475477664
  .mp4: Invalid data found when processing input
  

  Please suggest some solution to debug.

• Record Seemeless HD Video with ffmpeg libxh264

  3 octobre 2016, par Hannan

  I want to Record HD Video from HD Cam through ffmpeg. I want to encode the video as it is recorded. I am using the following script but the problem is after about 18 minutes it starts loosing frames with an error " non monotonous DTS in output stream"

  this is the script i am using:

  ffmpeg -f dshow -rtbufsize 1000000k -s 1280x720 -i video="HuddleCamHD":audio="Microphone (3- USB PnP Audio Device)" -map 0:v -b:v 8000k -map 0:a -s 1280x720 -vcodec libx264 -preset ultrafast -r 30 -rtbufsize 1000000k -acodec aac -b:a 320k "D:\VideoPutput.avi"
  

  A help would be nice thank you.

• How to Stream Live Video On Facebook in c#

  3 octobre 2016, par Mohd Shahid

  I am trying to stream live video on Facebook in c# windows application using ffmpeg library.

  i have stream url and stream key but i don't know how i can implement these key and Url in ffmpeg.

  please give me solution for that. Thankyou..!