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• Ubuntu12.04 : libavformat header trouble when compiling C program

  30 mai 2013, par Juneyoung Oh

  My code is super simple, just include "avformat.h" and call "av_register_all".

  full code is below.

    1 #include 
  
    2 #include 
  
    3 #include 
  
    4 //#include <libavcodec></libavcodec>avcodec.h>
  
    5 #include <libavformat></libavformat>avformat.h>
  
    6 //#include "libavcodec/avcodec.h"
  
    7 //#include "libavformat/avformat.h"
  
    8 
  
    9 
  
   10 int main (int argc, char* argv[]){
  
   11         av_register_all();
  
   12 /*
  
   13         AVFormatContext* pFormatCtx;
  
   14         const char* filename = "/home/juneyoungoh/Videos/CON1234ID.ts";
  
   15 
  
   16         if(av_open_input_file(&amp;pFormatCtx, filename, NULL, 0, NULL) != 0)
  
   17         {
  
   18                 handle_error();
  
   19         }
  
   20 
  
   21         if(av_find_stream_info(pFormatCtx) &lt; 0)
  
   22         {
  
   23                 handle_error();
  
   24         }
  
   25 
  
   26         dump_format(pFormatCtx, 0, filename, 1);
  
   27 
  
   28         //av_get_audio_frame_duration();
  
   29 */
  
   30         return 0;
  
   31 }

  The problem is when I compile this in Terminal it show error.

  /tmp/ccvgpGjv.o: In function `main':
  
  getDuration.c:(.text+0x10): undefined reference to `av_register_all'
  
  collect2: ld returned 1 exit status

  my avformat.h file is in /usr/local/include/libavformat/avformat.h.

  Here is something I have already tried.

  1. gcc getDuration.c
  2. gcc -I/usr/local/include/ getDuration.c
  3. gcc -I/usr/local/include/libavformat/ getDuration.c
  4. gcc -L/usr/local/include/ getDuration.c
  5. gcc -L/usr/local/include/libavformat/ getDuration.c
  6. gcc getDuration.c -lavformat

  Give me the light of hope +_+

• avi encoded to streaming mp4 or webmnot playing in html5 player

  30 mai 2013, par Vprnl

  [EDIT]

  I'm trying to get ffmpeg to encode various AVI files to mp4 for streaming purposes

  I use this nodejs to start FFMPEG.

  When I try this (webm) (some settings are wrapped by the node module but produce the default FFMPEG command) with this command :

          .withVideoCodec('libvpx')
  
          .addOptions(['-bf 8','-bt 240k','-preset fast','-strict -2','-b:v 320K','-bufsize 62000', '-maxrate 620k','-movflags +empty_moov','-y'])
  
          .withAudioBitrate('192k')
  
          .withAudioCodec('libvorbis')
  
          .toFormat('webm')

  The video get's streamed properly to the client but the duration isn't passed on. So the video has a duration of 'infinite'.

  So I tried to encode with H264. Which also works (I see the duration being set in the client) but no picture sadly.

  For H264 I use :

     .addOptions(['-y','-vcodec libx264','-bf 8','-bt 240k','-preset fast','-strict -2','-b:v 320K','-bufsize 62000', '-maxrate 620k','-acodec aac','-ab 128k','-movflags +empty_moov'])
  
     .toFormat('mp4')

  I get this log :

  

  I hope someone can point me in the right direction. Thanks !

  The client just gives an undefined error.
  I hope someone can point me in the right direction.

  Thanks

• Static image and a folder of mp3's ?

  28 juin 2013, par Shirohige

  I want to create a bunch of videos consisting of an single image which is shown throughout the whole video but each video has a different audio file. I can do it manually with various tools but the problem is that I have a lot of audio files and I can't optimize the frame rate (more on that later) and it takes a lot of time to do it that way but ffmpeg offers everything I need but the problem is that I don't know how to batch process everything.

  The basic code :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r frame-rate -t song-length -acodec copy output.mp4

  What I want to achieve :
  Let's say that I have a folder which consists of several audio files : song-name-1.mp3, song-name-2.mp3, ..., song-name-n.mp3 and cover.jpg.

  I need a batch file which takes the name of every mp3 file in a folder (a FOR loop I suppose) and processes it with the same command :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r frame-rate -t song-length -acodec copy output.mp4

  So the image is always the same for every video. The song length can be taken with the tool mp3info and the corresponding command :
  mp3info.exe -p %S song-name.mp3

  Since I only have one image throughout the whole video, the optimal frame rate would be the inverse of the video length which is 1/length (where length is a variable in seconds which we get from mp3info).

  So the final code should look something like this :
  ffmpeg -i song-name.mp3 -loop 1 -i cover.jpg -r 1/length -t length -acodec copy song-name.mp4

  Where "song-name" is a variable which changes for every iteration of the FOR loop (i.e. for every audio file in the folder) and length is a variable whose value we get with the command :
  mp3info.exe -p %S song-name.mp3

  I found examples of a FOR loop to fetch all file names of all mp3's in a specific folder but I do not know how to integrate mp3info. I hope that somebody can help me and I have some knowledge of the C programming language if that can be used in any way.