I am trying to use ffmpeg for Discord voice playback on Railway, but I am unable to make it work despite multiple approaches.

What I have tried so far:

1. Added a Linux ffmpeg binary to my repo and used a build step:

[build]
command = "chmod +x ffmpeg"

1. Tried Railway nixpacks, but ffmpeg was still not detected at runtime.

2. Tried using a Dockerfile:

FROM python:3.11-slim

RUN apt-get update && apt-get install -y ffmpeg

WORKDIR /app
COPY . .

RUN pip install --no-cache-dir -r requirements.txt

CMD ["python", "-u", "main.py"]

1. Added ffmpeg-python to requirements.txt, but this also did not help.

Behavior I am seeing:

• Bot connects to the voice channel successfully
• Audio playback does not work
• No clear ffmpeg error is shown in logs

I am using discord.py with FFmpegPCMAudio.

I would really appreciate help understanding:

• The correct way to install and use ffmpeg on Railway
• Whether Railway supports ffmpeg reliably for Discord voice bots
• If there is a recommended Railway configuration for this use case