combine bilibili flvs to one file

bilibili-combine.sh

cat /dev/null > ff.txt

for i in *.blv; do

    seq_num="${i%.blv}" # 分段序列号

    if [ "${#seq_num}" -eq 1 ]; then
        # 给文件名添 0
        mv "$i" "0$seq_num.flv"
    else
        mv "$i" "$seq_num.flv"
    fi

done

for i in *.flv; do
    # 再遍历一次防止变成 1、10、2、3 这样的顺序
    echo "file '${i}'" >> "ff.txt"
done

# 调用 ffmpeg 生成拼接后的视频
ffmpeg -f concat -i ff.txt -c copy ../output.mp4

rm ff.txt

printf "success"

######## single line edition
cat /dev/null > ff.txt;for i in *.blv; do seq_num="${i%.blv}";if [ "${#seq_num}" -eq 1 ];then mv "$i" "0$seq_num.flv";else mv "$i" "$seq_num.flv";fi;done;for i in *.flv; do echo "file '${i}'" >> "ff.txt";done;ffmpeg -f concat -i ff.txt -c copy ../output.mp4;rm ff.txt;printf "success"

# from https://blessing.studio/use-ffmpeg-to-concat-flv-videos-downloaded-by-bilibili-client/