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ffmpeg_video_transcoding
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| #!/usr/bin/:/usr/local/bin/ | |
| # set -u: only allow referencing of variables if they were previously defined | |
| # set -o pipefail: don't mask pipeline errors | |
| set -uo pipefail | |
| # case-insensitive regex matching | |
| setopt nocasematch | |
| video_input_dir="" | |
| video_output_dir="." | |
| thumbnail_output_dir="." | |
| # The convert_video() function transcodes an input mpg stream into h.264 mp4 video with the following parameters: | |
| # c:v libx264 => create H.264 video using the encoder x264 | |
| # profile:v main => use main profile (see https://trac.ffmpeg.org/wiki/Encode/H.264#Compatibility for compatibility) | |
| # r 30 => force frame rate to 30 fps | |
| # c:a libfdk_aac => Use Fraunhofer FDK AAC codec library (currently the highest-quality AAC encoder available with ffmpeg, see https://trac.ffmpeg.org/wiki/Encode/AAC. Requires ffmpeg to be compiled with --enable-libfdk-aac, see https://trac.ffmpeg.org/wiki/CompilationGuide) | |
| # ac 2 => downmix to stereo | |
| # b:a 160k => use constant bit rate of 160kbits | |
| # ar 44100 => set audio sampling frequency to 44.1khz | |
| # nostdin => prevent ffmpeg from reading its standard input | |
| function convert_video() { | |
| mkdir -p logs | |
| basename="$(basename "$1")" | |
| basename="$(echo -e "${basename}" | tr -d '[:space:]')" # strip whitespaces | |
| mp4_filename="${basename%.*}.mp4" | |
| if ! [[ "$basename" =~ ^[0-9]{4,6}.(mpg|mp4|wmv|mov)$ ]]; then | |
| echo "$1 invalid filename, skipping..." | |
| echo "$1" >> logs/invalid_filenames.log | |
| elif [ -e "$video_output_dir/$mp4_filename" ]; then | |
| echo "$mp4_filename already exists, skipping..." | |
| else | |
| echo "Transcoding $1" | |
| ffmpeg -i "$1" -c:v libx264 -profile:v main -r 30 -c:a libfdk_aac -ac 2 -b:a 160k -ar 44100 "$video_output_dir/$mp4_filename" &>"$video_output_dir/logs/$mp4_filename.log" -nostdin || log_errors | |
| ffmpeg -i "$video_output_dir/$mp4_filename" -ss 00:00:10.000 -vframes 1 "$thumbnail_output_dir/$mp4_filename.jpg" -nostdin | |
| fi | |
| } | |
| # log files that ffmpeg couldn't handle and remove broken output file | |
| function log_errors () { | |
| echo "$file" >> logs/broken_files.log | |
| rm "$video_output_dir/$mp4_filename" | |
| } | |
| # find all files in subdirectories (at least 2 levels nested) and transcode them | |
| while IFS= read -r file; do | |
| convert_video "$file" | |
| done < <(find "$video_input_dir" -mindepth 2 -type f) |
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