Recherche avancée

Sur d’autres sites (11574)

• Codec issue ? Mp4 video flashing during play via JW Player (and same issue with mac computer)

  19 décembre 2017, par janosdupai

  I have a linux based server online. It has Mp4 videos. I try to play these video with JW Player. I had any problems with them, but some files has the following problem : https://www.video.match-meeting.com/drive/5a350a6700bc4.mp4

  If I download this file to a windows computer, it plays without problem. Is that a codec problem with my server (and on my mac) ?

• FFMPEG Conversion Options [migrated]

  7 mars 2013, par Mike

  So, I've got some video files I want to convert so they match the formatting on another video file. I've got the format data (from ffprobe) for the video I want to match but I'm not sure how to use that to determine the options to convert my other videos. Any help ?

  Here are the settings on the file I want to match from ffprobe :

      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip #19.mov':
  
        Metadata:
  
          major_brand     : qt  
  
          minor_version   : 537199360
  
          compatible_brands: qt  
  
          creation_time   : 2013-03-05 22:27:26
  
        Duration: 00:15:00.00, start: 0.000000, bitrate: 119406 kb/s
  
          Stream #0:0(eng): Video: prores (apcn / 0x6E637061), yuv422p10le, 1440x1080, 117804 kb/s, SAR 4:3 DAR 16:9, 29.97 fps, 29.97 tbr, 2997 tbn, 2997 tbc
  
          Metadata:
  
            creation_time   : 2013-03-05 22:27:26
  
            handler_name    : Apple Alias Data Handler
  
            timecode        : 00:00:00;00
  
          Stream #0:1(eng): Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, 2 channels, s16, 1536 kb/s
  
          Metadata:
  
            creation_time   : 2013-03-05 22:27:26
  
            handler_name    : Apple Alias Data Handler
  
          Stream #0:2(eng): Data: none (tmcd / 0x64636D74)
  
          Metadata:
  
            creation_time   : 2013-03-05 22:27:26
  
            handler_name    : Apple Alias Data Handler
  
            timecode        : 00:00:00;00
  
      Unsupported codec with id 0 for input stream 2

  Any help would be greatly appreciated. Thanks.

• c Can you use variables from other files without using include ?

  2 juin 2021, par aszswaz

  I am reading the code of the ffmpeg project.In the fftools/ffmpeg.c file of this project, there is a piece of code on line 519 :

  


  519         if (do_benchmark) {
520             int maxrss = getmaxrss() / 1024;
521             av_log(NULL, AV_LOG_INFO, "bench: maxrss=%ikB\n", maxrss);
522         }


  


  I use gdb to find the definition location of the do_benchmark variable :

  


  (gdb) info variables do_benchmark
All variables matching regular expression "do_benchmark":

File fftools/ffmpeg_opt.c:
159:    int do_benchmark;
160:    int do_benchmark_all;


  


  However, I cannot find a statement like include fftools/ffmpeg_opt.c in the fftools/ffmpeg.c file.I use find + grep to no avail.

  


  $ find . -type f | xargs grep 'ffmpeg_opt'
grep: ./.git/objects/pack/pack-c2a6a6b1765b632f6fa88814ec92d3b0e4c11dad.pack：Match to binary file
grep: ./.git/index：Match to binary file
grep: ./ffmpeg：Match to binary file
./fftools/ffmpeg_opt.d:fftools/ffmpeg_opt.o: fftools/ffmpeg_opt.c fftools/ffmpeg.h config.h \
grep: ./fftools/ffmpeg_opt.o：Match to binary file
./fftools/Makefile:OBJS-ffmpeg                        += fftools/ffmpeg_opt.o fftools/ffmpeg_filter.o fftools/ffmpeg_hw.o
grep: ./ffmpeg_g：Match to binary file


  


  I wanted to try a similar approach, but failed.

  


  demo-01.c

  


  #include "stdio.h"

int main(void){
    fptintf(stdout, "demo: %d", demo);
    return 0;
}


  


  demo-02.c

  


  int demo = 0;


  


  $ gcc demo-01.c demo-02.c -o demo
demo-01.c: In the function ‘main’:
demo-01.c:4:33: Error: ‘demo’ is not declared (first use in this function)
    4 |     fprintf(stdout, "demo: %d", demo);
      |                                 ^~~~
demo-01.c:4:33: Note: Each undeclared identifier is only reported once in the function in which it appears.


  


  why is that ?