Bash脚本从ffprobe获取信息 [英] Bash Script to get info from ffprobe

问题描述

我正在尝试创建一个脚本来处理视频，但我希望从传入的文件中获取bit_rate，宽度和高度信息，以便更好地调整输出.当我一次处理一个文件时，该脚本起作用了，但是当我将其放入循环中时，突然间我没有任何信息.

I am trying to create a script to process videos, but I was hoping to get bit_rate, width, and height info from the incoming files so I could better tune the output. The script works when I do the files one at a time, but when I put it into a loop all of a sudden I don't get any info.

这可行:

#!/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;

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

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

在循环中，bitrate的数学运算也会出错，但是即使我将其注释掉，也仍然没有结果.由于它一次只能工作，因此我假设问题是bash脚本编写，与ffmpeg/ffprobe无关.

I also get an error with the math of bitrate in the loop, but even when I comment it out I still get no results. Since it works one at a time, I am assuming the problem is a bash scripting and nothing to do with ffmpeg / ffprobe.

话虽如此，我可以这样做:

That being said, I can do this:

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

然后回来

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

因此它确实会获取一些信息，但是会丢失eval语句中的信息.

So it does get some info back, but it loses the info from the eval statement.

推荐答案

我发现问题是$i变量中带有空格的文件.

I found the problem was files with whitespaces in the $i variable.

此代码将所有命令组合到一个shell命令中，该命令在当前文件夹和所有子目录中搜索所有视频文件，并通过一些选项设置循环以设置不同分辨率的比特率设置以及其他一些方法来进行循环.

This code combines all the commands into a single shell command that searches the current folder and all subdirectories for all video files, loops though with some options to setup bitrate settings for different resolutions along with some other things to spruce it up.

#!/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  

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