在 AWS Lambda function 中使用 python 运行 ffmpeg 命令时出现问题

Question

My use case is to concatenate the files using ffmpeg. I do it by specifying the S3 URLs (in a text file /tmp/files.txt) of the files to be concatenated.

Below is the command and and the way I run it using Python:

ffmpeg_cmd = "ffmpeg -f concat -safe 0 -protocol_whitelist file,http,https,tcp,tls -i /tmp/files.txt -c copy /tmp/output.mp4"
subprocess.run(ffmpeg_cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

The same Python file works perfectly fine when I run it on my Windows machine. But when it is run on AWS Lambda function, it fails. Please find below the error I get:

"errorMessage": "[Errno 2] No such file or directory: 'ffmpeg -f concat -safe 0 -protocol_whitelist file,http,https,tcp,tls -i /tmp/files.txt -c copy /tmp/output.mp4'", "errorType": "FileNotFoundError"

Am I doing it the right way? I suppose yes, as it works just fine on my Windows PC.

If someone faced this issue and fixed it, please help me with this issue.

Answer 1

FFMPEG is not pre-installed in the Lambda runtime environment. It has to be explicitly deployed as a Lambda Layer or bundled and uploaded with your Lambda function. If you did deploy it then the ffmpeg binary may not be executable or may not be on your PATH.

Here are a few options for deploying FFMPEG:

1. ffmpeg-aws-lambda-layer
2. ffmpeg-lambda-layer
3. install FFMPEG on Lambda

I tested a simple Lambda Python function without FFMPEG binaries and saw exactly the error message you are seeing. This is evidence that the ffmpeg binary is not installed in your Lambda environment or not on your PATH. The actual location of an uploaded ffmpeg binary depends on where you upload it to but it would typically be under /var/task/ if you uploaded the binary as part of your Lambda Layer or under /opt/ if deployed as part of your Lambda package. Rather than simply trying to execute ffmpeg , you might want to list files in those locations to verify what you have deployed.

Answer 2

Try This:-

ffmpeg_cmd = "/opt/ffmpeglib/ffmpeg -f concat -safe 0 -protocol_whitelist file,http,https,tcp,tls -i /tmp/audio_list.txt -c copy /tmp/output.mp4"

command1 = shlex.split(ffmpeg_cmd)

p1 = subprocess.run(command1, stdout=subprocess.PIPE, stderr=subprocess.PIPE)