Documentation Index
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Extract the audio track from a video and save it as MP3. Useful when you want to strip audio out for transcription, podcast generation, or separate audio processing.
Code
const API_KEY = process.env.RENDI_API_KEY;
// Submit the FFmpeg command
const submit = await fetch("https://api.rendi.dev/v1/run-ffmpeg-command", {
method: "POST",
headers: {
"Content-Type": "application/json",
"X-API-KEY": API_KEY,
},
body: JSON.stringify({
input_files: {
in_1: "https://storage.rendi.dev/sample/sample.avi",
},
output_files: {
out_1: "audio.mp3",
},
ffmpeg_command: "-i {{in_1}} -vn -c:a libmp3lame -q:a 2 {{out_1}}",
}),
});
const { command_id } = await submit.json();
// Poll until complete
while (true) {
const res = await fetch(`https://api.rendi.dev/v1/commands/${command_id}`, {
headers: { "X-API-KEY": API_KEY },
});
const data = await res.json();
if (data.status === "SUCCESS") {
console.log("Audio URL:", data.output_files.out_1.storage_url);
break;
}
if (data.status === "FAILED") throw new Error("Command failed");
await new Promise((r) => setTimeout(r, 2000));
}
import os
import time
import requests
API_KEY = os.environ["RENDI_API_KEY"]
BASE = "https://api.rendi.dev/v1"
headers = {"X-API-KEY": API_KEY}
# Submit the FFmpeg command
submit = requests.post(
f"{BASE}/run-ffmpeg-command",
headers=headers,
json={
"input_files": {"in_1": "https://storage.rendi.dev/sample/sample.avi"},
"output_files": {"out_1": "audio.mp3"},
"ffmpeg_command": "-i {{in_1}} -vn -c:a libmp3lame -q:a 2 {{out_1}}",
},
)
command_id = submit.json()["command_id"]
# Poll until complete
while True:
res = requests.get(f"{BASE}/commands/{command_id}", headers=headers).json()
if res["status"] == "SUCCESS":
print("Audio URL:", res["output_files"]["out_1"]["storage_url"])
break
if res["status"] == "FAILED":
raise RuntimeError("Command failed")
time.sleep(2)
# Submit the FFmpeg command
curl --request POST \
--url https://api.rendi.dev/v1/run-ffmpeg-command \
--header 'Content-Type: application/json' \
--header 'X-API-KEY: <api-key>' \
--data '{
"input_files": {"in_1": "https://storage.rendi.dev/sample/sample.avi"},
"output_files": {"out_1": "audio.mp3"},
"ffmpeg_command": "-i {{in_1}} -vn -c:a libmp3lame -q:a 2 {{out_1}}"
}'
# Response: { "command_id": "..." }
# Poll until complete
curl --request GET \
--url https://api.rendi.dev/v1/commands/<command_id> \
--header 'X-API-KEY: <api-key>'
How the FFmpeg command works
-i {{in_1}} — input video URL-vn — discard the video stream (audio only)-c:a libmp3lame — encode audio as MP3-q:a 2 — variable-bitrate quality (0 = best, 9 = worst; 2 is a good balance){{out_1}} — output file (audio.mp3)
To export as WAV, rename out_1 to audio.wav and drop the -c:a libmp3lame -q:a 2 flags — FFmpeg picks the codec from the extension.
Response
{
"output_files": {
"out_1": {
"file_id": "eba1a713-4631-4ccb-9ef8-b727a9f7f274",
"size_mbytes": 4.62,
"duration": 596.459,
"file_type": "audio",
"file_format": "mp3",
"storage_url": "https://storage.rendi.dev/temp_files/.../audio.mp3",
"bitrate_audio_kb": 128.0
}
},
"status": "SUCCESS",
"command_type": "FFMPEG_COMMAND"
}
