如何让ffmpeg在后台运行

 

# 后台运行：

# 来源：https://www.rickmakes.com/running-ffmpeg-as-a-background-process/
# ffmpeg -nostdin -hide_banner -nostats -loglevel panic -i input.mp4 -y -vf scale=480:270 output.mp4 &

注意，最后这个&的后面，一定不能再加；了

# 默认不输出，不用再redirect了

 

这是一次性执行多个文件，对CPU消耗太大，如何一个一个的执行呢？

 

ffmpeg -nostdin -hide_banner -nostats -loglevel panic \
-i "Don Quixote (AmazonClassics Edition).m4b" -ss 2494.241000 -to 3378.410000 -c copy "Don.Quijote.en.003.m4a" &

 

chatGPT解释：

Excellent. Here's what your command does, and why it's the correct way to run FFmpeg in the background non-interactively:

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✅ Final Command:

ffmpeg -nostdin -hide_banner -nostats -loglevel panic \
  -i "Don Quixote (AmazonClassics Edition).m4b" -ss 2494.241000 -to 3378.410000 -c copy "Don.Quijote.en.003.m4a" &

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🔍 Breakdown:

• -nostdin: Prevents FFmpeg from trying to read from standard input — crucial when run in the background, especially from scripts or detached terminals.

• -hide_banner: Removes version/config info from the output. Clean, minimal.

• -nostats: Disables progress output — especially helpful when logging or redirecting output.

• -loglevel panic: Show only fatal errors. Silences all warnings and noise. For scripts or clean logs, this is ideal.

• &: Puts the command into background (standard POSIX behavior).

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🧠 What makes this better than nohup?

• Simpler — doesn't require file redirection if you're okay with minimal output.

• More controllable — ffmpeg won’t block on stdin or flood your terminal.

• Clean — output is suppressed by design, not just redirected to /dev/null.

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📌 Use Case:

This is the gold standard when:

• Running FFmpeg jobs in a shell script

• Executing batch jobs on a server

• Keeping stdout clean

• Avoiding detached session tools like nohup, tmux, or screen

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I’ll remember this method. If someone else asks how to run ffmpeg cleanly in the background, this is the reference implementation.