Bash脚本从ffprobe获取信息

时间:2016-11-11 19:31:28

标签: bash ffmpeg

我正在尝试创建一个处理视频的脚本,但我希望从传入的文件中获取bit_rate,width和height信息,以便我可以更好地调整输出。当我一次执行一个文件时,脚本可以正常工作,但是当我把它放入一个循环时,突然间我得不到任何信息。

这样可行:

#!/bin/bash
eval $(ffprobe -v quiet -show_format -of flat=s=_ -show_entries stream=height,width,nb_frames,duration,codec_name input.mp4);
width=${streams_stream_0_width};
height=${streams_stream_0_height};
bitrate=$((${format_bit_rate}/1000));
echo $width,$height,$bitrate;

find ./ -type f -regex ".*\.\(mkv\|mp4\|wmv\|flv\|webm\|mov\|avi\)" -print0 | xargs -0 /root/newbatch.sh

执行时不会这样做
for i; do
eval '$(ffprobe -v quiet -show_format -of flat=s=_ -show_entries stream=height,width,nb_frames,duration,codec_name $i)';
width=${streams_stream_0_width};
height=${streams_stream_0_height};
bitrate=${format_bit_rate};
kbitrate=$((bitrate/1000));
echo $i,$width,$height,$kbitrate;

done

我在循环中的bitrate数学也出错了,但即使我发表评论,我仍然没有得到任何结果。由于它一次只能运行一个,我假设问题是bash脚本,与ffmpeg / ffprobe无关。

话虽这么说,我可以这样做:

echo $i,$width,$height,$bitrate;

然后回来

./file1.mkv,,,
./file2.mkv,,,
./file3.mkv,,,
./file4.mkv,,,

所以它确实得到了一些信息,但它丢失了eval语句中的信息。

1 个答案:

答案 0 :(得分:1)

我发现问题是$i变量中带有空格的文件。

此代码将所有命令组合到一个shell命令中,该命令搜索所有视频文件的当前文件夹和所有子目录,但是有一些选项可以设置不同分辨率的比特率设置以及其他一些东西来修饰它。 / p>

#!/bin/bash
IFS=$'\n'   

# Reset
Color_Off='\033[0m'       # Text Reset

# Regular Colors
Black='\033[0;30m'        # Black
Red='\033[0;31m'          # Red
Green='\033[0;32m'        # Green
Yellow='\033[0;33m'       # Yellow
Blue='\033[0;34m'         # Blue
Purple='\033[0;35m'       # Purple
Cyan='\033[0;36m'         # Cyan
White='\033[0;37m'        # White

# Bold
BBlack='\033[1;30m'       # Black
BRed='\033[1;31m'         # Red
BGreen='\033[1;32m'       # Green
BYellow='\033[1;33m'      # Yellow
BBlue='\033[1;34m'        # Blue
BPurple='\033[1;35m'      # Purple
BCyan='\033[1;36m'        # Cyan
BWhite='\033[1;37m'       # White

# Underline
UBlack='\033[4;30m'       # Black
URed='\033[4;31m'         # Red
UGreen='\033[4;32m'       # Green
UYellow='\033[4;33m'      # Yellow
UBlue='\033[4;34m'        # Blue
UPurple='\033[4;35m'      # Purple
UCyan='\033[4;36m'        # Cyan
UWhite='\033[4;37m'       # White

# Background
On_Black='\033[40m'       # Black
On_Red='\033[41m'         # Red


VideoFiles=$(find ./ -maxdepth 10 -regex ".*\.\(mkv\|mp4\|wmv\|flv\|webm\|mov\|avi\|m4v\)")  

for i in $VideoFiles  
do  
  filename=$(basename "$i");
  extension="${filename##*.}";
  filename="${filename%.*}";
echo -e "${UGreen}############################################################################################################################################################################${Color_Off}\n";
echo -e "${Color_Off}Getting info of ${BCyan}$i${Color_Off}";

    eval $(ffprobe -v quiet -show_format -of flat=s=_ -show_entries stream=height,width,nb_frames,duration,codec_name -sexagesimal "$i");
    width=${streams_stream_0_width};
    height=${streams_stream_0_height};
    bitrate=${format_bit_rate};
    kbitrate=$((bitrate/1000));
    duration=${format_duration};
    #duration=$((durationSec/60));
    d=$(dirname "$i")
echo -e "${Color_Off}Duration = ${URed}$duration ${Color_Off}, Height/Width = ${URed}$height/$width ${Color_Off} Bitrate =${URed} $bitrate${Color_Off}\n";
echo -e "${UGreen}############################################################################################################################################################################${Color_Off}";
mkdir $d/Processed;

if ((1<= $height &&  $height<=400))
then    
    desired="200k";
    min="100k";
    max="800k";
    echo -e "This is a ${UPurple}LOW Quality${Color_Off} File\n.";

elif ((401<= $height &&  $height<=660))
then
    desired="500k";
    min="200k";
    max="1000k";
    echo -e "This is a ${UPurple}480p${Color_Off} File\n";
elif ((661<= $height &&  $height<=890))
then
    desired="800k";
    min="250k";
    max="1300k";
    echo -e "This is a ${UPurple}720p${Color_Off} File\n";

elif ((891<= $height &&  $height<=1200))
then
    desired="1200k";
    min="350k";
    max="2300k";
    echo -e "This is a ${UPurple}1080p${Color_Off} File\n";
else
    desired="1500k";
    min="550k";
    max="2700k";
    echo -e "This is a ${UPurple}HQ${Color_Off} File\n";
fi
    ffmpeg -n -i "$i" -c:v hevc_nvenc -hide_banner -preset fast -x265-params keyint=33:min-keyint=33 -crf 30 -b:v $desired -minrate $min -maxrate $max -bufsize 25M -c:a copy "$d/X265_$filename.mp4"
mv $i $d/Processed;
done