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• ffmpeg doesn't accept input in script

  21 octobre 2022, par Eberhardt

  this is a beginner's question but i can't figure out the answer after looking into it for several days :

  


  I want ffmpeg to extract the audio portion of a video and save it in an .ogg container. If i run the following command in terminal it works as expected :

  


  ffmpeg -i example.webm -vn -acodec copy example.ogg


  


  For convenience, i want to do this in a script. However, if i pass a variable to ffmpeg it apparently just considers the first word and produces the error "No such file or directory".

  


  I noticed that my terminal escapes spaces by a \ so i included this in my script. This doesn't solve the problem though.

  


  Can someone please explain to me, why ffmpeg doesn't consider the whole variable that is passed to it in a script while working correctly when getting passed the same content in the terminal ?

  


  This is my script that passes the filename with spaces escaped by \ to ffmpeg :

  


  #!/bin/bash

titelschr=$(echo $@ | sed "s/ /\\\ /g")
titelohne=$(echo $titelschr | cut -d. -f 1)
titelogg=$(echo -e ${titelohne}.ogg)  

ffmpeg -i $titelschr -vn -acodec copy $titelogg


  


  Thank you very much in advance !

  


• can't record docker selenium with ffmpeg and ubuntu 18

  1er janvier 2019, par Alex028502

  I have a script that starts a selenium/standalone-chrome container, starts recording with ffmpeg, and runs the selenium tests. However, it is not working with ubuntu 18, possibly because of the ffmpeg version (3.4.4 instead of 2.8.15).

  I have broken down the problem into a couple commands which work fine in ubuntu 16 but not ubuntu 18 :

  start selenium container in terminal #1

  docker run --network=host --shm-size=2g -e SCREEN_WIDTH=1920 -e SCREEN_HEIGHT=1080 selenium/standalone-chrome:3.141.59-antimony

  start recording in terminal #2

  rm -f test.mp4
  
  # :99 seems to be the default for the selenium container
  
  ffmpeg -f x11grab -video_size 1920x1080 -i :99 -codec:v libx264 -r 4 test.mp4

  and I get something that looks like this

  frame=    2 fps=0.1 q=-1.0 Lsize=       2kB time=00:00:00.25 bitrate=  75.9kbits/s dup=0 drop=413 speed=0.0165

  the time stays at 0, and then goes up to 25msec when I stop it.

  On the other hand, if I just start regular screen buffer in terminal #1

  Xvfb :99 -screen 0 1920x1080x24

  and run the same thing as above in terminal #2, everything works

  Also, I am pretty sure that the above ffmpeg command worked in ubuntu 16, with ffmpeg-3.

  So to summarise when the above ffmpeg command seems to work :

                     | ubuntu 16 (ffmpeg 3) | ubuntu 18 (ffmpeg 4)
  
  just start Xvfb    | works                | works
  
  selenium container | works                | DOES NOT WORK

  Any ideas ?

• FFMPEG to OpenGL Texture

  23 avril 2014, par Spamdark

  I was here to ask, how can I convert an AVFrame to an opengl texture. Actually, I created a renderer the outputs me the audio (Audio is working) and the video, but the video is not outputing. Here is my code :

  Texture creation :

  glGenTextures(1,&_texture);
  
  glBindTexture(GL_TEXTURE_2D,_texture);
  
  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  
  
  
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); 
  
  glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );

  Code Info : _texture variable is a GLuint that keeps the texture ID

  Function that gets the AVFrame and convert it to OpenGL Texture :

  int VideoGL::NextVideoFrame(){
  
  // Get a packet from the queue
  
  AVPacket *videopacket = this->DEQUEUE(VIDEO);
  
  int frameFinished;
  
  if(videopacket!=0){
  
      avcodec_decode_video2(_codec_context_video, _std_frame,&frameFinished,videopacket);
  
  
  
      if(frameFinished){
  
  
  
          sws_scale(sws_ctx, _std_frame->data, _std_frame->linesize, 0, _codec_context_video->height, _rgb_frame->data, _rgb_frame->linesize);
  
  
  
          if(_firstrendering){
  
          glBindTexture(GL_TEXTURE_2D,_texture);
  
          glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, _codec_context_video->width,_codec_context_video->height,0,GL_RGB,GL_UNSIGNED_BYTE,_rgb_frame->data[0]);
  
  
  
          _firstrendering = false;
  
  
  
          }else{
  
  
  
              glActiveTexture(_texture);
  
              glBindTexture(GL_TEXTURE_2D,_texture);
  
              glTexSubImage2D(GL_TEXTURE_2D,0,0,0,_codec_context_video->width,_codec_context_video->height,GL_RGB,GL_UNSIGNED_BYTE,_rgb_frame->data[0]);
  
  
  
          }
  
          av_free_packet(videopacket);
  
          return 0;
  
      }else{
  
  
  
          av_free_packet(videopacket);
  
          return -1;
  
      }
  
  
  
  }else{
  
      return -1;
  
  }
  
  return 0;
  
  }

  Code Information : There is a queue where a thread store the AVFrames, this function is frequently called to get the AVFrames, until it gets a NULL it stops to being called.

  That’s actually not working. (I tried to look at some questions in stack overflow, it’s still not working)
  Any example, or someone that helps me to correct any error there ?

  Additional Data : I tried to change the GL_RGB to GL_RGBA and started to play with the formats, anyway it crashes when I try GL_RGBA (Because the width and height are very big, anyway I tried to resize them). I have tried to change the sizes to Power Of 2, stills not working.

  1 Edit :

  Thread function :

  DWORD WINAPI VideoGL::VidThread(LPVOID myparam){
  
  
  
  VideoGL * instance = (VideoGL*) myparam;
  
  instance->wave_audio->Start();
  
  
  
  int quantity=0;
  
  
  
  AVPacket packet;
  
  while(av_read_frame(instance->_format_context,&packet) >= 0){
  
      if(packet.stream_index==instance->videoStream){
  
          instance->ENQUEUE(VIDEO,&packet);
  
      }
  
      if(packet.stream_index==instance->audioStream){
  
          instance->ENQUEUE(AUDIO,&packet);
  
      }
  
  }
  
  
  
  instance->ENQUEUE(AUDIO,NULL);
  
  instance->ENQUEUE(VIDEO,NULL);
  
  
  
  return 0;
  
  }

  Thread creation function :

  CreateThread(NULL, 0, VidThread, this, NULL, NULL);

  Where this refers to the class that contains the NextVideoFrame, and the _texture members.

  Solved :

  I followed some of the datenwolf tips, and now the video is displaying correctly with the audio/video :