ffprobe如何同时检索音频和视频信息并输出到单行? [英] ffprobe how to retrieve both audio and video info and output to single line?

问题描述

我可以使用以下方法检索音频和视频编解码器以及视频帧的高度:

I can use the following to retrieve the audio and video codec and the video frame height:

ffprobe -v quiet -show_entries stream=index,codec_name,height -of csv input.mp4

但是输出是两行，并且包含我不需要的文本:

But the output is on two lines and includes text that I don't need like so:

stream,0,h264,720
stream,1,mp3

我唯一想要的输出是以下形式:

The only output I want is to be in the form of:

mp3,h264,720

我曾尝试在同一命令行中两次使用-show_entries，但每次都会忽略第一次调用.我也尝试过使用

I've tried using -show_entries twice in the same command line, but it ignores the first call every time. I've also tried using

ffprobe -v quiet -select_streams v -show_entries stream=codec_name,height, -select_streams a -show_entries stream=codec_name

但是那什么也没做.

如何获得上述指定的简化输出?

How can I get the simplified output as specified above?

推荐答案

我们在评论中进行了交谈之后，我认为您正在寻找类似的内容.这是一个批处理+ JScript混合脚本.我正在使用JScript解析和物化ffprobe的JSON输出.加盐调味，并在准备执行脚本时从第31行中删除echo.

After our conversation in the comments, I think something like this is what you're looking for. It's a Batch + JScript hybrid script. I'm using JScript to parse and objectify the JSON output by ffprobe. Salt to taste, and remove echo from line 31 when you're ready for the script to act.

@if (@CodeSection == @Batch) @then
@echo off & setlocal & goto run

:usage
echo Usage: %~nx0 infile outfile
echo This script re-encodes videos to x265 + AAC encoding.
exit /b

:run
if "%~2"=="" goto usage
if not exist "%~1" goto usage

set ffprobe=ffprobe -v quiet -show_entries "stream=codec_name,height" -of json "%~1"

for /f "delims=" %%I in ('%ffprobe% ^| cscript /nologo /e:JScript "%~f0"') do set "%%~I"

if %height% lss 720 (
    echo Video is ^< 720p.  Not worth it.
    exit /b
)

set "pre=-hide_banner -fflags +genpts+discardcorrupt+fastseek -analyzeduration 100M"
set "pre=%pre% -probesize 50M -hwaccel dxva2 -y -threads 3 -v error -stats"
set "global="
set "video=-c:v libx265 -crf 22 -preset fast"
set "audio=-c:a libfdk_aac -flags +qscale -global_quality 4 -afterburner 1"

if defined hevc if defined aac (
    echo Already in x265 + AAC format.
    exit /b
)

if defined aac (
    echo Already has AAC audio.  Re-encoding video only.
    set "audio=-c:a copy"
) else if defined hevc (
    echo Already has x265 video.  Re-encoding audio only.
    set "video=-c:v copy"
)

echo ffmpeg %pre% -i "%~1" %global% %video% %audio% "%~2"

goto :EOF
@end // end Batch / begin JScript

var stdin = WSH.CreateObject('Scripting.FileSystemObject').GetStandardStream(0),
    htmlfile = WSH.CreateObject('htmlfile'),
    JSON;

htmlfile.write('<meta http-equiv="x-ua-compatible" content="IE=9" />');
htmlfile.close(JSON = htmlfile.parentWindow.JSON);

var obj = JSON.parse(stdin.ReadAll());

for (var i = obj.streams.length; i--;) {
    if (obj.streams[i].height) WSH.Echo('height=' + obj.streams[i].height);
    if (/hevc/i.test(obj.streams[i].codec_name)) WSH.Echo('hevc=true');
    if (/aac/i.test(obj.streams[i].codec_name)) WSH.Echo('aac=true');
}

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