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• mov : Fix handling of zero-length metadata values

  15 décembre 2014, par Martin Storsjö

  mov : Fix handling of zero-length metadata values
  Since 3cec81f4d4, a zero-length metadata value would try to
  
  allocate 2*0 bytes, where av_malloc() returns NULL.
  Always add one to the allocated length, to allow space for
  
  a null terminator in the zero-length case.
  Incidentally, this fixes fate-alac on RVCT 4.0, where a compiler
  
  bug seems to mess up the mov muxer to the point that it writes
  
  the wrong sort of metadata. Previously this bug was undetected,
  
  but since 3cec81f4d4 such mov files started returning
  
  AVERROR(ENOMEM) in the mov demuxer.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] libavformat/mov.c

• 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

  


• Add logo on concatenated video

  5 septembre 2020, par ottpeter

  I'm trying to add a logo on top of a concatenated video. The video concatenation and the adding of the logo should be in the same filter complex. My filter complex currently looks like this (it is generated by Bash) :

  


  [0:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v0];[1:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v1];[2:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v2];[3:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v3];[4:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v4];[5:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v5];[6:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v6];[7:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v7];[8:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v8];[9:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v9];[10:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v10];[11:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v11];[12:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v12];[13:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v13];[14:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v14];[15:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v15];[16:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v16];[17:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v17];[18:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v18];[19:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v19];[20:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v20];[21:v]scale=854:480:force_original_aspect_ratio=1,pad=width=854:height=480:x='if(lt(in_w,854),(854-in_w)/2,0)':0,setsar=1[v21];movie=/home/logo.png, scale=180:-1 [logo];
[v0][v1][v2][v3][v4][v5][v6][v7][v8][v9][v10][v11][v12][v13][v14][v15][v16][v17][v18][v19][v20][v21] concat=unsafe=1:n=22:v=1:a=0[conc]; [conc][logo] overlay=50:50 [outv];


  


  On 0bin, it is easier to read. So, there is a really long video concatenation part, and on the end, I would try to add the logo like this :

  


  


  [conc][logo] overlay=50:50 [outv] ;

  


  


  This is the error I'm getting :

  


  [AVFilterGraph @ 0x5640862fc520] No such filter: '' 
Error initializing complex filters.
Invalid argument


  


  How to do this correctly ?

  


  EDIT :
This is the Bash script :

  


      echo "Creating the video list..."
    # Number of videos
    VID_NUMBER=$(find $VIDS_PATH -maxdepth 1 -type f -printf . | wc -c)
    # File names can not contain spaces. INPUT_LIST will contain the list of input files, all files in VIDS folder.
    INPUT_LIST=""
    for file in $VIDS_PATH*
    do
        if [ ${file: -4} == ".jpg" ]
        then
            INPUT_LIST="${INPUT_LIST} -loop 1 -t $IMAGE_DURATION -i $file"
        else
            INPUT_LIST="${INPUT_LIST} -i $file"
        fi
    done

    echo "Creating filter complex..."
    # This is the beginning of the filter that is used for concatenation. Has to be an entry for all videos.
    FILTER_COMPLEX_LIST=""
    for ((i=0; i<$VID_NUMBER; i++))
    do
        FILTER_COMPLEX_LIST="${FILTER_COMPLEX_LIST}[$i:v]scale=$RES_X:$RES_Y:force_original_aspect_ratio=1,pad=width=$RES_X:height=$RES_Y:x='if(lt(in_w,$RES_X),($RES_X-in_w)/2,0)':0,setsar=1[v$i];"
    done

    # Insert logo
    FILTER_COMPLEX_LIST="${FILTER_COMPLEX_LIST}movie=$LOGO, scale=180:-1, setpts=PTS-STARTPTS [logo];"

    # Filter final line. This is also generated in a loop. Tells ffmpeg which videos to concat and specifies output [outv]. No sound.
    FILTER_FINAL_LINE=""
    for ((i=0; i<$VID_NUMBER; i++))
    do
        FILTER_FINAL_LINE="${FILTER_FINAL_LINE}[v$i]"
    done
    FILTER_FINAL_LINE="${FILTER_FINAL_LINE} concat=unsafe=1:n=22:v=1:a=0[conc]; [conc][logo] overlay=50:50 [outv];"

    # Run ffmpeg
    date +"%Y %b %d %H:%M:%S Starting ffmpeg to stream videos ..." >> /home/streamer.log
    ffmpeg \
        -y \
        -fflags +genpts \
        $INPUT_LIST \
        -filter_complex "\
        $FILTER_COMPLEX_LIST \
        $FILTER_FINAL_LINE" \
        -map "[outv]" \
        $OUTPUT_SETTINGS \
        $OUTPUT

        sleep 1
done