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• How ffmpeg work on server for different type of users ? [on hold]

  7 août 2016, par sam

  I have a question about ffmpeg and I am using mac and xampp and php and jQuery. I make a function that upload video or image file or another type when I saw examples of ffmpeg in Stack Overflow. My questions are :

  1. client can be window user or mac or another than we have to download all different type of ffmpeg file for example ffmpeg.exe and mac can be another because when I saw how to download ffmpeg than they show me different operating system.

  2. And where we have to save ffmpeg file in xampp

  3. If I download all things for mac and I run it and it works and I make my website online and than any Windows user or Linux user will upload video it will work for him also. But we do not client download ffmpeg in their system

  If anybody know good example of create thumbnail for video please tell me.

• ffmpeg - dump_format() function print out 00:00:00

  16 juin 2013, par Juneyoung Oh

  I am working with ffmpeg.

  The only function that I needed is just extract duration of video on memory, not console.

  to do this, I realized that I have to redesign dump_format() function

  witch defined in avformat.h.

  below is the original source and especially what I need is dump_format

  that located in line 3063.

  http://ffmpeg.org/doxygen/0.6/libavformat_2utils_8c-source.html#l03063

  when I use dump_format, it returns everything fine but except duration.

  duration always returns 00:00:00.

  below is my test code. When I call line 31 is fine, but not 32.

  I want know what is wrong with my code.

  I suspect the fact that I dropped function dump_metadata.

  But everytime I use that function console prints undefined function error.

    1 #include <libavcodec></libavcodec>avcodec.h>
  
    2 #include <libavformat></libavformat>avformat.h>
  
    3 #include 
  
    4 #include 
  
    5 #include 
  
    6 
  
    7 void dump_format1(AVFormatContext* ic, int index, const char* url, int is_output);
  
    8 
  
    9 int main(int argc, char *argv[]) {
  
   10         AVFormatContext* pFormatCtx;
  
   11         int secs;
  
   12         //need those for printing...
  
   13 
  
   14         if(argc &lt; 2) {
  
   15                 printf("Please provide a movie file\n");
  
   16                 return -1;
  
   17         }
  
   18         //threat Exception for arguements.
  
   19 
  
   20         av_register_all();
  
   21         //register all codecs
  
   22 
  
   23         //========== Check Context
  
   24         if(av_open_input_file(&amp;pFormatCtx, argv[1], NULL, 0, NULL) != 0)
  
   25                 return -1;
  
   26 
  
   27         if(av_find_stream_info(pFormatCtx) &lt; 0)
  
   28                 return -1;
  
   29 
  
   30         //========== Print Basic Information
  
   31         //dump_format(pFormatCtx, 0 , argv[1], 0);
  
   32         dump_format1(pFormatCtx, 0 , argv[1], 0);
  
   33 
  
   34 
  
   35         if(pFormatCtx->duration != AV_NOPTS_VALUE){
  
   36                 secs = (pFormatCtx->duration) / AV_TIME_BASE;
  
   37         }
  
   38 
  
   39         /*
  
   40                 AV_TIME_BASE = 1000000
  
   41         */
  
   42 
  
   43         printf("%d\n",secs);
  
   44 
  
   45         return 0;
  
   46 }
  
   47 
  
   48 void dump_format1(AVFormatContext *ic,
  
   49                   int index,
  
   50                   const char *url,
  
   51                   int is_output) {
  
   52 
  
   53         int i;
  
   54         uint8_t *printed = av_mallocz(ic->nb_streams);
  
   55         if (ic->nb_streams &amp;&amp; !printed)
  
   56                 return;
  
   57 
  
   58         av_log(NULL, AV_LOG_INFO, "%s #%d, %s, %s &#39;%s&#39;:\n",
  
   59         is_output ? "Output" : "Input",
  
   60         index,
  
   61         is_output ? ic->oformat->name : ic->iformat->name,
  
   62         is_output ? "to" : "from", url);
  
   63 
  
   64         dump_metadata(NULL, ic->metadata, "  ");
  
   65 
  
   66         //if (!is_output) {
  
   67         av_log(NULL, AV_LOG_INFO, "  Duration: ");
  
   68 
  
   69 
  
   70 
  
   71 
  
   72         int hours, mins, secs, us;
  
   73         secs = ic->duration / AV_TIME_BASE;
  
   74         us = ic->duration % AV_TIME_BASE;
  
   75         mins = secs / 60;
  
   76         secs %= 60;
  
   77         hours = mins / 60;
  
   78         mins %= 60;
  
   79         av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%02d", hours, mins, secs,
  
   80         (100 * us) / AV_TIME_BASE);
  
   81         return;
  
   82 }

  I compile with following commands.

  gcc -o tutorial01 tutorial01.c -lavformat -lavcodec -lswscale -lz
  ./tutorial01 /home/juneyoungoh/Videos/CON1234ID.ts

  Thanks for your guidences in advance.

• Bulk merge many .mp4s in one [closed]

  14 août 2022, par Sam van Viegen

  I need some help with bulk merging a bunch of .mp4 files into one.

  


  I tried to do this, which gave me a list of all the .mp4 files :

  


  (for %i in (*.mp4) do @echo file '%i') > mylist.txt


  


  Then I tried this :

  


  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4


  


  It made a convert but the video is kinda messed up. Its now 28 hours long and the video isn’t good.

  


  What should I do ?