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• c FFmpeg undefined refference error [duplicate]

  14 août 2017, par galagala

  This question already has an answer here :

  • What is an undefined reference/unresolved external symbol error and how do I fix it ?
    
    28 answers
    

  I want to write my own video player, so I am trying to use FFmpeg with C.
  I am using Ubuntu 16.04.3 LTS and compile FFmpeg following this tutorial https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

  after that I did add libavcodec.a to linker setting list and the source code path to search directory (using codeblocks)

  but my code still get error : undefined refference to "avcodec_register_all()"

  #include 
  
  #include "libavcodec/avcodec.h"
  
  int main()
  
  {
  
      avcodec_register_all();
  
      return 0;
  
  }

  after that, I search the libavcodec folder
  I did find avcodec.h and void avcodec_register_all(void) defined in it
  but I couldn’t find avcodec.c in the folder

  Is that normal ? and is that the reason why I got undefined reference error ?
  how to fix it ?

• Mpegts packet corrupt with ffmpeg concat protocol

  1er novembre 2022, par Curious Octopus

  I'm trying to use the concat protocol in ffmpeg as described in the ffmpeg docs :
https://trac.ffmpeg.org/wiki/Concatenate

  


  However I'm getting lots of errors about corrupt packets when running the concat, so I'm worried that this isn't the best approach. My actual use case will involve running unsupervised with a ton of different source videos, so I want to be sure that it's solid.

  


  The concat demuxer approach succeeds without errors but takes about 10 times as long.

  


  Steps to reproduce

  


  Download Big Buck Bunny :

  


  wget https://download.blender.org/demo/movies/BBB/bbb_sunflower_1080p_30fps_normal.mp4


  


  Transcode a 30 second chunk :

  


  ffmpeg -i bbb_sunflower_1080p_30fps_normal.mp4 -ss '00:06:30' -t 30 -c:v libx264 -crf 18 bbb30.mp4


  


  Create one second parts :

  


  mkdir -p parts;
for i in $(seq -f "%02g" 0 29); do \
  ffmpeg \
    -i bbb30.mp4 \
    -ss "00:00:$i" -t 1 \
    -c:v libx264 -pix_fmt yuv420p -crf 18 \
    -bsf:v h264_mp4toannexb \
    -f mpegts \
    -y parts/$i.ts;
done


  


  Combine all the parts into a new output mp4 :

  


  ffmpeg -y \
  -i "concat:parts/00.ts|parts/01.ts|parts/02.ts|parts/03.ts|parts/04.ts|parts/05.ts|parts/06.ts|parts/07.ts|parts/08.ts|parts/09.ts|parts/10.ts|parts/11.ts|parts/12.ts|parts/13.ts|parts/14.ts|parts/15.ts|parts/16.ts|parts/17.ts|parts/18.ts|parts/19.ts|parts/20.ts|parts/21.ts|parts/22.ts|parts/23.ts|parts/24.ts|parts/25.ts|parts/26.ts|parts/27.ts|parts/28.ts|parts/29.ts" \
  -c copy \
  output.mp4


  


  Stderr has lots of warnings about corrupt packets (in this case always at dts = 21300) :

  


  [mpegts @ 0x555d172daa00] Packet corrupt (stream = 0, dts = 213000).
concat:parts/00.ts|parts/01.ts|parts/02.ts|parts/03.ts|parts/04.ts|parts/05.ts|parts/06.ts|parts/07.ts|parts/08.ts|parts/09.ts|parts/10.ts|parts/11.ts|parts/12.ts|parts/13.ts|parts/14.ts|parts/15.ts|parts/16.ts|parts/17.ts|parts/18.ts|parts/19.ts|parts/20.ts|parts/21.ts|parts/22.ts|parts/23.ts|parts/24.ts|parts/25.ts|parts/26.ts|parts/27.ts|parts/28.ts|parts/29.ts: corrupt input packet in stream 0


  


  The resulting mp4 looks ok to my eye, but obviously ffmpeg isn't happy about something. Any ideas ?

  


• AVI to MP4 - ffmpeg conversion

  4 juin 2014, par Emmanuel Brunet

  I’m running a debian 7.5 machine with ffmpeg-2.2 installed following these instructions

  Issue

  I’m trying to display a mp4 video inside my browser. The original file has an AVI container format. I can successfully convert it to mp4 and the targetfile is readable (video + sound) with the totem movie player. So I thought everything would be OK displaying the bellow page

  HTML5 web page

      
  
  
  
  
  
  <video width="640" height="480" controls="controls">
  
    <source src="/path/to/output.mp4" type="video/mp4">
  
  <h3>Your browser does not support the video tag</h3>
  
  </source></video>

  Input probe

  $ ffprobe -show_streams input.avi
  
  
  
    Duration: 00:08:22.90, start: 0.000000, bitrate: 1943 kb/s
  
      Stream #0:0: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 64 kb/s
  
      Stream #0:1: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x540 [SAR 1:1 DAR 4:3], 1870 kb/s, 29.97 fps, 25 tbr, 29.97 tbn, 25 tbc

  Convert

  $ ffmpeg -y -fflags +genpts -i input.avi -acodec copy -vcodec copy ouput.mp4

  Html browser

  Opening the above html file plays sound but no video is displayed.

  When I use other .mp4 files, videos succesfully displayed so I’m sure I face a conversion issue.

  Not : I’ve tryed a lot of other ffmpeg options but without success.

  Any idea ?

  Thanks in advance.