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• fix scalarproduct_and_madd_int16_altivec() for orders > 16

  24 mai 2013, par Kostya Shishkov

  fix scalarproduct_and_madd_int16_altivec() for orders > 16
  the second and third sources were incremented only by half of the needed size
  

  • [DBH] libavcodec/ppc/int_altivec.c

• FFMPEG Batch Copy Metadata from "Folder1File1.mp3" to "Folder2File1.mp3" in different folders

  27 février 2020, par Vektorz

  I have two separate files in separate folders with the same name and I would like to transfer the metadata from the file in "folder1" to "folder2".
  Then I would like to add a whole bunch of files fitting this same format and batch transfer all of the metadata information.

  From a stack exchange thread I’ve tried :

  "The following script will loop through the the files in one directory, find corresponding files in a second directory and then combine these two files into a third output directory
  
  
  
  dir1=FIRST DIRECTORY
  
  dir2=SECOND DIRECTORY
  
  output=OUTPUT DIRECTORY
  
  for file in $(ls $dir1); do
  
    ffmpeg -i "$dir1/$file" -i "$dir2/$file" -map 1 -c copy \
  
     # copies all global metadata from in0.mkv to out.mkv  
  
     -map_metadata 0 \
  
     # copies video stream metadata from in0.mkv to out.mkv
  
     -map_metadata:s:v 0:s:v \
  
     # copies audio stream metadata from in0.mkv to out.mkv
  
     -map_metadata:s:a 0:s:a \
  
     "$outdir/$file"
  
  done"

  But for the life of me I cannot get this to work properly and it is a bit overkill. He continues on saying :

  If you want to make something reuseable you could put this in a script with the following header (remove the assignment for dir1, dir2 and output in the script above). And then call it as script.sh dir1 dir2 outdir
  
  
  
  #!/bin/bash
  
  set -x errexit # exit immediately on error
  
  dir1="$1"
  
  dir2="$2"
  
  output="$3"

  And I am totally lost. Can someone please help me to get this to work and walk me through it a bit easier as I’m fairly inexperienced with code/FFMPEG.

  Thank you.

• FFmpeg playing audio slowly after conversion from AAC

  18 janvier 2014, par AnthonyM

  I'm attempting to convert an AAC audio stream for playback. I've discovered that I need to convert from AV_SAMPLE_FMT_FLTP to AV_SAMPLE_FMT_S16 but when I do so the audio plays back at about half speed.

  swr = swr_alloc();
  
  assert(av_opt_set_int(swr, "in_channel_layout", audioContext->channel_layout, 0) == 0);
  
  assert(av_opt_set_int(swr, "out_channel_layout", audioContext->channel_layout, 0) == 0);
  
  assert(av_opt_set_int(swr, "in_sample_rate", audioContext->sample_rate, 0) == 0);
  
  assert(av_opt_set_int(swr, "out_sample_rate", 44100, 0) == 0);
  
  assert(av_opt_set_int(swr, "in_sample_fmt", audioContext->sample_fmt, 0) == 0);
  
  assert(av_opt_set_int(swr, "out_sample_fmt", AV_SAMPLE_FMT_S16, 0) == 0);
  
  swr_init(swr);

  There is my code to convert. The input sample rate is 44100 and the audio is stereo.

  I call the code with

  swr_convert(swr, &output, aDecodedFrame->nb_samples, (const uint8_t**)aDecodedFrame->extended_data, aDecodedFrame->nb_samples) >= 0)