Windows - FFmpeg - 如何将 jpg 文件映射到视频流 0:0 并且只包含音频流 0:2 而不是流 0:1 和 0:2

Question

I am trying to write a batch script that begins by extracting a thumbnail "Cover.jpg" from an mkv video. My end goal is to have this script recursively loop a folder full of videos to encode them all in one go.

:: create cover art jpg
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)

Then I am trying to encode the 4K mkv video that I got the jpg thumbnail from to 1920x1080 resolution instead of it's native 4K to make it easier to play back on my home plex server.

I have surround sound 6 channel speaker system so I want to take audio stream 0:2 which is Dolby DTS 6 channel and save some HDD space by converting it to -c:a ac3 -b:a 640k -ac 6 .

I have gotten stuck because I can achieve everything I want except I keep encoding 2 of the 4 audio streams available in the end. I only want to keep 1 audio stream to maximize my space savings.

Here is the entire script so far.

@echo off
setlocal enabledelayedexpansion
prompt $g
color 0a

pushd "%~dp0"

set FF=C:\MAB\local64\bin-video\ffmpeg.exe
set TITLE=MOVIETITLE

:: create cover art jpg file
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)

:: run ffmpeg x265
for %%I in (*.mkv) do (
set fname="%%~nxI"
set fout="%%~nI-temp.mkv"
call :runff !fname! !fout!
del /s /q *.jpg
pause
goto:eof
)

:runff
%FF% -ss 0 ^
-y ^
-i "%~1" ^
-attach "Cover.jpg" ^
-map_metadata 0 ^
-map_chapters 0 ^
-metadata title="%TITLE%" ^
-map 0:0 -metadata:s:v:0 language=eng ^
-map 0:2 -metadata:s:a:0 language=eng -metadata:s:a:0 title="Surround 5.1 (DTS)" ^
-map 0:3 -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -metadata:s:t:0 filename="Cover.jpg" -metadata:s:t:0 mimetype="image/jpeg" ^
-c:v libx265 -preset medium ^
-x265-params crf=18:qcomp=0.8:aq-mode=1:aq_strength=1.0:qg-size=16:psy-rd=0.7:psy-rdoq=5.0:rdoq-level=1:merange=44 ^
-c:a ac3 -b:a 640k -ac 6 ^
-t 3 ^
"%~2"
exit /b

Here are the output logs. https://pastebin.com/hVMy3VJW

You can see towards the bottom that it is encoding both audio streams.

Any ideas guys?

Answer 1

Solved:

Update: 06.21.20 -Improved variable name output method. -Formatting changes

Instructions: Create a batch file with this code and place it in the folder with the files you are wanting to change. You must change the ff variable to point to your own ffmpeg.exe file if it is not on the system path. This only works with .mkv videos.

This script by default will erase all audio channels except for the first one and replace it with aac surround 6 channel encoding. It will name the channel the same name as the input file. The original file will still be there in case you make an error and need to retry.

@echo off
setlocal enabledelayedexpansion
color 0a

pushd "%~dp0"

set ff=C:\MAB\local64\bin-video\ffmpeg.exe

set sec=30
set fjpeg=cover.jpg

for %%G in (*.mkv) do (
%ff% -hide_banner -ss %sec% -y -i "%%G" -vframes 1 -an !fjpeg!
)

for %%I in (*.mkv) do (
set fname="%%~nxI"
set title="%%~nI"
set audio="AAC Surround 5.1"
set fout="%%~nI_audio_new.mkv"
call :runFF !fname! !title! !audio! !fout!
del /q *.jpg
pause
goto :eof
)

:runFF
%ff% ^
-y ^
-i "%~1" ^
-attach "!fjpeg!" ^
-map_metadata 0 ^
-map_chapters 0 ^
-metadata title="%~2" ^
-map 0:0 -metadata:s:v:0 language=eng -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -metadata:s:t:0 filename="!fjpeg!" -metadata:s:t:0 mimetype="image/jpeg" ^
-map 0:1 -metadata:s:a:0 language=eng -metadata:s:a:0 title="%~3" ^
-c:v copy ^
-c:a ac3 -b:a 640k -ac 6 ^
"%~4"
exit /b

Original post below:

I figured out you can combine the different -map streams. So I took -map 0:0 and combined it with -map 0:3 and left -map 0:2 to decode the audio stream I wanted.

Here is a working script that fits my question.

@echo off
setlocal enabledelayedexpansion
prompt $g
color 0a

pushd "%~dp0"

set FF=C:\MAB\local64\bin-video\ffmpeg.exe

:: create cover art jpg file
for %%G in (*.mkv) do (
%FF% -hide_banner -ss 30 -y -i "%%G" -vframes 1 -an Cover.jpg
)

:: run ffmpeg x265
for %%I in (*.mkv) do (
set TITLE=%%~nI
set fname="%%~nxI"
set fout="%%~nI(1080p).mkv"
call :runff !fname! !fout!
del /s /q *.jpg
pause
goto:eof
)

:runff
%FF% ^
-y ^
-i "%~1" ^
-attach "Cover.jpg" ^
-map_metadata 0 ^
-map_chapters 0 ^
-metadata title="%TITLE%" ^
-map 0:0 -metadata:s:v:0 language=eng -metadata:s:s:0 language=eng -metadata:s:s:0 title="English" -metadata:s:t:0 filename="Cover.jpeg" -metadata:s:t:0 mimetype="image/jpeg" ^
-map 0:2 -metadata:s:a:0 language=eng -metadata:s:a:0 title="Surround 5.1 (DTS)" ^
-c:v libx265 -preset medium -crf 20 -vf "scale=1920:-1" -threads 0 ^
-c:a ac3 -b:a 640k -ac 6 ^
"%~2"
exit /b