Question 1

How do I convert a video to MP4 using fluent-ffmpeg?

Accepted Answer

Use chainable methods like .input('video.avi').videoCodec('libx264').audioCodec('aac').format('mp4').save('output.mp4'). The README provides examples with error handling via .on('error', ...) and .on('end', ...) events.

Question 2

What are good alternatives to fluent-ffmpeg since it's deprecated?

Accepted Answer

Consider ffmpeg-static for bundled FFmpeg binaries or fluent-ffmpeg forks like ffmpeg-fluent, but for active maintenance, libraries like ffmpeg.wasm or direct child_process spawn with FFmpeg might be better. Always check GitHub for updated forks or newer Node.js media modules.

Question 3

How to install fluent-ffmpeg on Windows?

Accepted Answer

Install via npm, but you must set FFMPEG_PATH and FFPROBE_PATH environment variables since FFmpeg isn't typically in PATH. The README notes Windows users need these paths configured manually for the library to work.

Question 4

Why is the progress percentage in fluent-ffmpeg sometimes wrong?

Accepted Answer

The README explains that percentage estimation relies on guessing total duration from the first input, so it's inaccurate with streams or multiple inputs of different lengths. Use timemarks or frames for more precise tracking.

Question 5

Can fluent-ffmpeg handle live video streaming?

Accepted Answer

Yes, it supports streaming with input/output streams and events, but the deprecated status means compatibility with modern streaming protocols may be limited. The examples folder includes a real-time streaming example using express.

Question 6

How do I add custom FFmpeg options not covered by the API?

Accepted Answer

Use .inputOptions() or .outputOptions() methods to pass raw FFmpeg arguments, as shown in the README with examples like .inputOptions('-someOption') for flexibility beyond the built-in methods.

Question 7

fluent-ffmpeg vs direct FFmpeg commands: which is better?

Accepted Answer

Fluent-ffmpeg simplifies command building and error handling in Node.js, but direct FFmpeg calls offer more control and avoid dependency risks. For new projects, consider the trade-off between ease of use and maintenance concerns due to deprecation.

fluent-ffmpeg

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