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• 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

  


• Script doesnt recognize bars / length right for cutting audio , ffmpeg terminal

  14 avril 2024, par totzillarbeats

  This terminal script doesn't recognize bars / length right for cutting audio, maybe somebody knows what's 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