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• Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (360p.m3u 8) has not been used for any stream.

  28 avril, par Marc Archenault

  I am receiving this warning from ffmpeg. The job runs and all the videos seem to output correctly. I have 2 hls, 1 mp4 with overlay + A single thumbnail.

  



  The warning :

  



  Stream #1:0 : Video : png, rgba(pc), 500x38, 25 tbr, 25 tbn, 25 tbc
Codec AVOption b (set bitrate (in bits/s)) specified for output file #0 (360p.m3u
8) has not been used for any stream. The most likely reason is either wrong type
 (e.g. a video option with no video streams) or that it is a private option of s
ome encoder which was not actually used for any stream.

  



  The windows batch command :

  



  ffmpeg -loglevel info -threads 2 -hide_banner -y -i SampleVideo_1280x720_10mb.mp4 -i ecocastvideo-overlay-shadow-white-500.png^
 -filter_complex "[1]colorchannelmixer=aa=0.7,scale=iw*0.7 :-1[wm] ;[0:v][wm]overlay=(main_w-overlay_w)-10 :(main_h-overlay_h)-30,split=3[a][b][c] ;[a]scale=w=640:h=360:force_original_aspect_ratio=decrease[a] ;[b]scale=w=1280:h=720:force_original_aspect_ratio=decrease[b] ;[c]scale=w=1280:h=720:force_original_aspect_ratio=decrease[c]"^
 -map "[a]" -map 0:v -c:v h264 -profile:v main -crf 20 -preset veryfast -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:a 96k -hls_flags single_file 360p.m3u8^
 -map "[b]" -map 0:v -c:v h264 -profile:v main -crf 20 -preset veryfast -sc_threshold 0 -g 72 -keyint_min 72 -hls_time 4 -hls_playlist_type vod -b:a 96k -hls_flags single_file 720p.m3u8^
 -map "[c]" -map 0:v -c:v h264 -profile:v main -preset veryfast 720.mp4^
 -map 0:v -y -ss 0.5 -vframes 1 -an -s 120x90 -ss 30 thumbname-00001.png

  


• pnacl-clang doesn't know where ffmpeg libraries are (but Eclipse does ?)

  10 août 2014, par lavsprat

  I’m trying to make my first "hello world"-like app using ffmpeg libraries. I already got NaCl SDK and downloaded & compiled the ffmpeg port.

  This is my code :

  main.c

  #include <libavformat></libavformat>avformat.h>
  
  
  
  int main()
  
  {
  
      av_register_all();
  
      return 0;
  
  }

  Building with $ (...)/pnacl-clang main.c -o main -lavformat in terminal.

  The output :

  main.c:2:10: fatal error: 'libavformat/avformat.h' file not found
  
  #include <libavformat></libavformat>avformat.h>
  
           ^

  Now, why am I not using -L(...)\lib and -I(...)\include in the build command ? Because it should work without it. In my workplace nacl-clang somehow knows where the libs are and compiles everything successfully. Why is that not working on my personal computer ? How can I permanently let pnacl-clang know where to look for them ?

• How to specify bit rate while using concatenating videos ?

  2 juillet 2018, par r.mirzojonov

  I’ve been trying to write ffmpeg command that would take 3 mp4 videos(intro, main, outro) and 1 image (logo) then it would resize intro and concatenate them while adding logo to main video.

  ffmpeg -i intro.mp4 -i main.mp4 -i outro.mp4 -i logo.png -filter_complex "[0:v]scale=1280:720,setsar=sar=1[scaled]; [1][3]overlay=5:5[main]; [scaled][0:a][main][1:a][2:v][2:a]concat=n=3:v=1:a=1 [v] [a]" -map "[v]" -map "[a]" -c:a aac output.mp4

  So far this works fine, but when I try to specify the bit rate of output file. Here it says that I need to use Two-pass method but I don’t know to correctly apply that method in my case, because the example shown there uses only 1 video while mine concatenates them.
  Should I even use two-pass method or is there any other way to specify bit rate ?