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• Read Output in Batch

  29 septembre 2016, par arielbeje

  I am using this code to try and download a video+subtitles using youtube-dl and then combine them using ffmpeg.

  I am trying to set the video/subtitle output to title.extension instead of the regular title id.extesion, but to do that youtube-dl has a command that outputs it like an echo command, so I need to read it.

  @echo off
  
  echo Write a link and press enter
  
  set /p link=
  
  cls
  
  
  
  youtube-dl.exe -u myusername -p mypassword --skip-download --sub-lang enUS --sub-format "ass" --output "%(uploader)s%(title)s.%(ext)s" "%link%"
  
  youtube-dl.exe -u myusername -p mypassword -f worst --ffmpeg-location "%cd%\ffmpeg.exe" --hls-prefer-ffmpeg --console-title --output "%(uploader)s%(title)s.%(ext)s" "%link%"
  
  
  
  youtube-dl.exe -u myusername -p mypassword --skip-download --get-title "%link%" > title.txt
  
  for /f "delims=" %%x in (title.txt) do set title=%%x
  
  ffmpeg.exe -i "%cd%\%title%.flv" -vf "ass=%cd%\%title%.ass" "%cd%\%title%.mkv"
  
  pause

• ac3dec : Fix out-of-array read

  23 novembre 2013, par Tim Walker

  ac3dec : Fix out-of-array read
  Signed-off-by : Diego Biurrun <diego@biurrun.de>
  

  • [DBH] libavcodec/ac3dec.c

• write with PortAudio into fifo and read with ffmpeg on OSX

  22 novembre 2017, par M. P.

  What I am trying to do :

  1. open my microphone as audio source in PortAudio (works)
  2. write stream into fifo (works)
  3. read fifo with ffmpeg (dosen’t work)

  In PortAudio I am using the Blocking I/O like here :
  http://portaudio.com/docs/v19-doxydocs/blocking_read_write.html

  In the loop I write into the fifo like this :

  int data = write('/tmp/aaa', sampleBlock, bufferSize);

  when I read it to PortAudio write buffer it works.

  bytes_read = read('/tmp/aaa', readSampleBlock, bufferSize);
  
  err = Pa_WriteStream(stream, readSampleBlock, bufferSize)

  when I read it with ffmpeg on console :

  ffmpeg -y -i /tmp/aaa -f s16le -acodec copy -f nut -ar 48000 -ac 2 -v debug -report -acodec copy out.wav

  It just blocks the loop and that’s it.

  Can anybody help me figure out what do I need to do ?

  My code :

  #define SAMPLE_SIZE (1)
  
  #define FRAMES_PER_BUFFER (480)
  
  #define AUDIOFIFO "/tmp/aaa"
  
  
  
  char *sampleBlock = NULL;
  
  int status, captured_bytes, fifo, bytes_read;
  
  
  
  
  
  err = Pa_OpenStream(&stream,
  
                      &inputParameters,
  
                      NULL,
  
                      48000,
  
                      FRAMES_PER_BUFFER,
  
                      paClipOff,
  
                      NULL, /* no callback, use blocking API */
  
                      NULL ); /* no callback, so no callback userData */
  
  if( err != paNoError ) goto error;
  
  
  
  numBytes = FRAMES_PER_BUFFER * numChannels * SAMPLE_SIZE ;
  
  sampleBlock = (char *) malloc( numBytes );
  
  memset( sampleBlock, SAMPLE_SILENCE, numBytes );
  
  
  
  if (status = mkfifo(AUDIOFIFO, 0666) < 0) 
  
  { 
  
    printf("Error making AUDIOFIFO: %s \n", strerror(errno)); 
  
  }
  
  err = Pa_StartStream( stream );
  
  if( err != paNoError )
  
  {
  
    goto error;
  
  } 
  
  
  
  fifo = open(AUDIOFIFO, O_RDWR, O_NONBLOCK);
  
  if (fifo < 0) printf("Error opening AUDIOFIFO: %s \n", strerror(errno));
  
  
  
  for( i=0; i<(60*48000)/FRAMES_PER_BUFFER; ++i )
  
  {   
  
    if ((err = Pa_ReadStream(stream, sampleBlock, FRAMES_PER_BUFFER)) != paNoError)
  
    {
  
      goto xrun;
  
    }  
  
    captured_bytes = write(fifo, sampleBlock, FRAMES_PER_BUFFER);
  
    if (captured_bytes < 0) 
  
    { 
  
      printf("Error writing to AUDIOFIFO: %s \n", strerror(errno));
  
    }
  
  
  
    framesProcessed += bufferSize;
  
  }