feat: 添加ffmpeg批处理脚本

src/content/post/软件/06 我自己常用的ffmpeg批处理.md

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+---
+title: 我自己常用的ffmpeg批处理
+date: 2024-10-14
+author: KazooTTT
+type: Post
+status: Published
+tags: [视频处理, ffmpeg]
+finished: false
+published: true
+category: 软件
+slug: my-own-commonly-used-ffmpeg-batching
+description:
+---
+
+## 720x1080批量转1920x1080（两边黑屏）
+
+手机直播的时候录播机录出来的分辨率是720x1080，使用ffmpeg转成横屏的1920x1080。这样xml转ass弹幕的时候，就不需要另外处理了，看起来很更舒服。
+
+macos的写法：
+
+```bash
+input_folder="" # 要转化的录播的文件夹路径
+output_folder="" # 要输出的文件夹路径
+
+# Create the output folder if it does not exist
+mkdir -p "$output_folder"
+
+for f in "$input_folder"/*.flv; do
+  ffmpeg -i "$f" -vf "scale=720:1080,pad=1920:1080:(ow-iw)/2:(oh-ih)/2" -c:a copy "$output_folder/$(basename "${f%.*}.mp4")"
+done
+```
+
+windows的写法：
+
+```powershell
+$input_folder = "Z:\\rec\\48743-hanser\\20240731-又来画画了！"  # 要转化的录播的文件夹路径
+$output_folder = "Z:\\rec\\48743-hanser\\20240731-又来画画了！"  # 要输出的文件夹路径
+
+# Create the output folder if it does not exist
+If (-Not (Test-Path $output_folder)) {
+    New-Item -ItemType Directory -Path $output_folder | Out-Null
+}
+
+Get-ChildItem -Path $input_folder -Filter *.flv | ForEach-Object {
+    $input_file = $_.FullName
+    $output_file = Join-Path $output_folder ($_.BaseName + ".mp4")
+    $ffmpeg_args = @("-i", $input_file, "-vf", "scale=720:1080,pad=1920:1080:(ow-iw)/2:(oh-ih)/2", "-c:a", "copy", $output_file)
+    & ffmpeg $ffmpeg_args
+}
+```
+
+效果
+
+![image.png](https://pictures.kazoottt.top/2024/10/20241014-20241014224347.png)
+
+## 弹幕压制
+
+### windows版(使用cuda)
+
+```bash
+@echo off
+set input_folder=YourInputFolderPath
+set output_folder=YourOutputFolderPath
+
+for %%a in ("%input_folder%\\*.flv") do (
+    ffmpeg -hwaccel cuda -c:v h264_cuvid -i "%%a" -vf subtitles="%%~na.ass" -c:v h264_nvenc -b:v 6000k -c:a copy "%output_folder%\\%%~na_压制.mp4" -y
+)
+```
+
+### macOS版
+
+```bash
+#!/bin/bash
+
+input_folder="/path/to/input"  # Replace with your input folder path
+output_folder="/path/to/output"  # Replace with your output folder path
+
+mkdir -p "$output_folder"  # Create the output folder if it doesn't exist
+
+for f in "$input_folder"/*.mp4; do
+    subtitle_file="${f%.*}.ass"  # Assumes subtitle file name is same as video file name but with .ass extension
+    output_file="$output_folder/$(basename "${f%.*}_压制.mp4")"  # Output file name with _ass suffix
+
+    ffmpeg -i "$f" -vf "ass=$subtitle_file" "$output_file"
+done
+```