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errorous's questions

Martin Hope
errorous
Asked: 2025-03-31 12:58:20 +0800 CST
  • 7

Estou tentando escrever um script bash para baixar todos os vídeos de uma playlist pública do YouTube. Aqui está o que tenho até agora:

#!/bin/bash

# Default values
decode_video=true
output_format="avi"
audio_codec="libmp3lame"
audio_bitrate="192k"
audio_sample_rate="44100"
audio_channels="2"
video_codec="libxvid"
video_quality="3"

# Function to download and convert each video
download_and_convert() {
    local video_url="$1"
    local output_name="$2"
    
    # Show download start message
    echo "Downloading: $output_name.mp4..."

    # Download the video
    yt-dlp --progress -f "bv*+ba/b" --merge-output-format mp4 "$video_url" -o "$output_name.mp4"

    # Show download end message
    echo "Downloaded: $output_name.mp4"

    # Check if video should be re-encoded
    if $decode_video; then

        # Debug: Output the values of the variables
        echo "output_name: \"$output_name\""
        echo "video_codec: $video_codec"
        echo "video_quality: $video_quality"
        echo "audio_codec: $audio_codec"
        echo "audio_sample_rate: $audio_sample_rate"
        echo "audio_bitrate: $audio_bitrate"
        echo "audio_channels: $audio_channels"

        # Re-encode video to MPEG-4 (Xvid) and convert audio to MP3
        echo "Converting video to MPEG-4 (Xvid) and audio to MP3..."
        
        # Ensure that the script runs the command directly without any prompt
        ffmpeg -hide_banner -i "$output_name.mp4" -c:v libxvid -qscale:v 3 -c:a libmp3lame -ar 44100 -b:a 192k -ac 2 "$output_name.avi"

    else
        # Copy the video and only convert audio
        echo "Copying video and converting audio to MP3..."
        ffmpeg -i "$output_name.mp4" -c:v copy -c:a $audio_codec -ar $audio_sample_rate -b:a $audio_bitrate -ac $audio_channels "$output_name.$output_format"
    fi

    # Clean up the original MP4 file
    #rm "$output_name.mp4"
    echo "Converted: $output_name.$output_format"
}

# Parse command-line options
while [[ $# -gt 0 ]]; do
    case $1 in
        --no-decode-video)
            decode_video=false
            shift
            ;;
        --decode-video)
            decode_video=true
            shift
            ;;
        *)
            playlist_url="$1"
            shift
            ;;
    esac
done

# Ensure playlist URL is provided
if [ -z "$playlist_url" ]; then
    echo "Usage: $0 <playlist_url> [--no-decode-video]"
    exit 1
fi

# Get total number of videos in the playlist
total_videos=$(yt-dlp -j --flat-playlist "$playlist_url" | jq -r '.id' | wc -l)
echo "Total videos in playlist: $total_videos"

# Download the playlist and process each video
current_video=1
yt-dlp -j --flat-playlist "$playlist_url" | jq -r '.id' | while read -r video_id; do
    # Define output filename
    output_name="video_$video_id"
    
    # Show progress
    echo "Processing video $current_video of $total_videos..."
    
    # Download and convert the video
    download_and_convert "https://www.youtube.com/watch?v=$video_id" "$output_name"
    
    # Increment video counter
    current_video=$((current_video + 1))
done

echo "All videos processed successfully!"

Agora, o download de vídeos funciona, mas a conversão ffmpegfalha. Ele começa a mostrar a saída regular ffmpeg, como se estivesse convertendo corretamente, e então mostra: Parse error, at least 3 arguments were expected, only 1 given in string 'GC1Y0'. O que pode ser? Li em um tópico diferente que há um problema ao citar nomes de arquivos.

bash