doc: update ffmpeg.md #18
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@ -581,6 +581,7 @@ $ ffmpeg -f concat -i mylist.txt -c:v copy -c:a flac -strict -2 output.mp4
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视频过滤器
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---
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<!--rehype:body-class=cols-2-->
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### 格式
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@ -631,7 +632,6 @@ ffmpeg -i 1.mp4 -b:v 548k -vf delogo=x=10:y=10:w=120:h=45:show=1 output.mp4
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<!--rehype:className=wrap-text -->
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### 创建缩略图
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<!--rehype:wrap-class=row-span-2-->
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在 10 秒时创建一个缩略图
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@ -686,6 +686,7 @@ $ ffmpeg -i 1.mp4 -i test.mp3 \
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音频过滤器
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<!--rehype:body-class=cols-2-->
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### 调节音量
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@ -720,6 +721,7 @@ $ ffmpeg -i input.mp3 -af "channelmap=1-0|1-1" output.mp3
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流处理
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<!--rehype:body-class=cols-2-->
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### 拉流
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@ -736,6 +738,7 @@ $ ffmpeg -re -i test.mp4 -f flv rtmp://127.0.0.1/test
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```
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### 转发
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<!--rehype:wrap-class=col-span-2-->
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```bash
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# 拉取流并转发
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