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• OSX/Cocoa app crashing when finished running ffmpeg terminal command

  23 juin 2014, par codeman

  I’m running ffmpeg within my Mac app and it’s actually creating the output file successfully. The problem is that the app crashes as soon as the ffmpeg command is finished. Any ideas on how to prevent the crash ?

  Here’s the code I’m using to run ffmpeg in my Mac app :

  char ffm_cmd[512];
  
  NSString *command = [NSString stringWithFormat:@"%@%@ \\\n-filter_complex '[0:0][1:0][2:0][3:0]concat=n=%d:v=0:a=1[out]' \\\n-map '[out]' %@/output.wav", escapedPath, concatFiles, count, self.outputFolderPath];
  
  const char *cString = [command cStringUsingEncoding:NSASCIIStringEncoding];
  
  sprintf(ffm_cmd,cString);
  
  system(ffm_cmd);

• FFmpeg conversion to mp3 works in terminal, not in script

  19 juillet 2013, par user2598172

  I can run

  ffmpeg -i test.m4a -vn -acodec libmp3lame -ab 256k test.mp3

  And it works perfectly. However, when I have the line :

  ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT" &> /dev/null

  running in a .sh script (downloading the same file that I was able to successfully convert through the terminal), it returns an mp3 file with no audio data. Does anyone have any idea what could be causing this ? Thanks !

  EDIT : here is the whole script :

   #!/bin/bash
  
  
  
  TITLE="$(echo "$1" | ./recode html..ascii | tr -d '\' | tr -s ' ' | sed 's|\ *$||')"
  
  TAG_TITLE="$2"
  
  ARTIST="$(echo "$3" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  ALBUM="$(echo "$4" | ./recode html..ascii | tr -d '\' | tr -s ' ')"
  
  IMG="$5"
  
  TRACK_NUMBER="$6"
  
  TOTAL_TRACKS="$7"
  
  URL="$8"
  
  MIX_TITLE="$9"
  
  CONVERT="${10}"
  
  RECURSIVE="${11}"
  
  SESSION_ID="${12}"
  
  DOWNLOAD_ID="${13}"
  
  SONG_ID="${14}"
  
  
  
  SONG_SAVE="songs/$SONG_ID"
  
  ZIP_SAVE="$SESSION_ID-$DOWNLOAD_ID.zip"
  
  ZIP_DIR="$MIX_TITLE/"
  
  ARTWORK_SAVE="artwork/$MIX_TITLE.png"
  
  SAVE_TITLE="$(echo "$TITLE" | sed 's|/|-|g;s|^\.||g')"
  
  
  
  [ "$TAG_TITLE" == "false" ] && unset TITLE
  
  [ "$ARTIST" == "false" ] && unset ARTIST
  
  [ "$ALBUM" == "false" ] && unset ALBUM
  
  [ "$IMG" == "false" ] && unset IMG
  
  [ "$TRACK_NUMBER" == "false" ] && unset TRACK_NUMBER TOTAL_TRACKS
  
  [ "$CONVERT" == "false" ] && unset CONVERT
  
  [ "$RECURSIVE" == "false" ] && unset RECURSIVE
  
  
  
  while [ -f "SONG_SAVE".part ]; do
  
      sleep 2
  
  done
  
  
  
  if [ -f "$SONG_SAVE".m4a ]; then
  
      EXT=".m4a"
  
      touch "$SONG_SAVE$EXT"
  
  elif [ -f "$SONG_SAVE".mp3 ]; then
  
      EXT=".mp3"
  
      touch "$SONG_SAVE$EXT"
  
  else
  
      curl -Lso "$SONG_SAVE".part "$URL"
  
  
  
      if [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG ADTS")" ]; then
  
          EXT=".mp3"
  
      elif [ -n "$(file -b "$SONG_SAVE".part | grep "MPEG v4")" ]; then
  
      EXT=".m4a"
  
  else
  
      EXT=".txt"
  
      echo "Unable to download: $URL. Sorry ):" > "$SONG_SAVE".part
  
  fi
  
  
  
  mv "$SONG_SAVE".part "$SONG_SAVE$EXT"
  
  fi
  
  
  
  if [ -n "$CONVERT" ] && [ "$EXT" == ".m4a" ]; then
  
  EXT=".mp3"
  
  if [ ! -f "$SONG_SAVE$EXT" ]; then
  
      ./ffmpeg -i "$SONG_SAVE.m4a" -vn -acodec libmp3lame -ab 256k "$SONG_SAVE$EXT"         &> /dev/null
  
      fi
  
  fi
  
  
  
  if [ "$EXT" == ".mp3" ]; then
  
      ./eyeD3 --remove-images -t "$TITLE" -a "$ARTIST" -A "$ALBUM" -n "$TRACK_NUMBER" -N     "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
          ./eyeD3 --add-image="$ARTWORK_SAVE":FRONT_COVER "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  elif [ "$EXT" == ".m4a" ]; then
  
  if [ -n "$IMG" ]; then
  
      [ ! -f "$ARTWORK_SAVE" ] && curl -Lso "$ARTWORK_SAVE" "$IMG"
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -P "$ARTWORK_SAVE" -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
      fi
  
  else
  
      if [ -n "$TRACK_NUMBER" ]; then
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" -t "$TRACK_NUMBER" -T "$TOTAL_TRACKS" "$SONG_SAVE$EXT" &> /dev/null
  
      else
  
          ./mp4tags -r P -s "$TITLE" -a "$ARTIST" -R "" -A "$ALBUM" "$SONG_SAVE$EXT" &> /dev/null
  
          fi
  
      fi
  
  fi
  
  
  
  if [ -n "$RECURSIVE" ]; then
  
      cd archives
  
      mkdir -p "$ZIP_DIR"
  
      chmod 777 "$ZIP_DIR"
  
      cp "../$SONG_SAVE$EXT" "$ZIP_DIR$SAVE_TITLE$EXT"
  
      ./zip -q -0 -D -r "$ZIP_DIR$ZIP_SAVE" "$ZIP_DIR$SAVE_TITLE$EXT" &> /dev/null
  
      rm -f "$ZIP_DIR$SAVE_TITLE$EXT"
  
      printf "archives/$ZIP_DIR$ZIP_SAVE\n$MIX_TITLE.zip\n$EXT\n"
  
      echo "$(du -h "$ZIP_DIR$ZIP_SAVE" | tr '\t' '\n' | head -1)"
  
  else
  
      printf "$SONG_SAVE$EXT\n$SAVE_TITLE$EXT\n$EXT"
  
  fi

• script doesnt recognize bars / lenght right for cutting audio , ffmpeg terminal

  14 avril 2024, par totzillarbeats

  This Terminal script doesnt recognize bars / lenght right for cutting audio , maybe somebody knows whats wrong with the calculation :)

  


  Would be happy about any help the cutting already works !

  


  #!/bin/bash

# Function to extract BPM from filename

get_bpm() {
    local filename="$1"
    local bpm=$(echo "$filename" | grep -oE '[0-9]{1,3}' | head -n1)
    echo "$bpm"
}

# Function to cut audio based on BPM
cut_audio() {
    local input_file="$1"
    local bpm="$2"
    local output_file="${input_file%.*}_cut.${input_file##*.}" # Appends "_cut" to original filename

    # Define the number of beats per bar (assuming 4 beats per bar)
    beats_per_bar=4

    # Calculate the duration of each bar in seconds
    bar_duration=$((60 * beats_per_bar / bpm))

    # Define start and end times for each bar range
    start_times=(0 21 33 45 57 69 81 93 105 117 129 141)
    end_times=(20 29 41 53 65 77 89 101 113 125 137 149)

    # Iterate through each bar range
    for ((i = 0; i < ${#start_times[@]}; i++)); do
        start_time=${start_times[$i]}
        end_time=${end_times[$i]}
        echo "Cutting audio file $input_file at $bpm BPM for bar $((i + 1)) ($start_time-$end_time) for $bar_duration seconds..."

        # Cut audio for current bar range using ffmpeg
        ffmpeg -i "$input_file" -ss "$start_time" -to "$end_time" -c copy "$output_file"_"$((i + 1)).${input_file##*.}" -y
    done

    # Check if the output files are empty and delete them if so
    for output_file in "${output_file}"_*; do
        if [ ! -s "$output_file" ]; then
            echo "Output file $output_file is empty. Deleting..."
            rm "$output_file"
        fi
    done

    echo "Audio cut and saved as $output_file"
}


# Main script
if [ "$#" -eq 0 ]; then
    echo "Usage: $0 [audio_file1] [audio_file2] ..."
    exit 1
fi

for file in "$@"; do
    bpm=$(get_bpm "$file")
    if [ -z "$bpm" ]; then
        echo "Error: No BPM found in filename $file"
    else
        cut_audio "$file" "$bpm"
    fi
done


  


  Maybe its only the math calc in the beginning but idk :)

  


  If you need more details just lmk