Documentation Index
Fetch the complete documentation index at: https://rendi.dev/docs/llms.txt
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Extract multiple frames from a video in a single call, each at its own timestamp. Cheaper than N separate calls since the input is decoded once.
Code
const API_KEY = process.env.RENDI_API_KEY;
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: "thumbnail1.jpg",
out_2: "thumbnail2.jpg",
},
ffmpeg_command:
"-i {{in_1}} -filter_complex \"[0:v]split=2[first][second];[first]select='gte(t,10)'[thumb1];[second]select='gte(t,20)'[thumb2]\" -map [thumb1] -frames:v 1 {{out_1}} -map [thumb2] -frames:v 1 {{out_2}}",
}),
});
const { command_id } = await submit.json();
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("Thumb 1:", data.output_files.out_1.storage_url);
console.log("Thumb 2:", data.output_files.out_2.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 = 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": "thumbnail1.jpg", "out_2": "thumbnail2.jpg"},
"ffmpeg_command": "-i {{in_1}} -filter_complex \"[0:v]split=2[first][second];[first]select='gte(t,10)'[thumb1];[second]select='gte(t,20)'[thumb2]\" -map [thumb1] -frames:v 1 {{out_1}} -map [thumb2] -frames:v 1 {{out_2}}",
},
)
command_id = submit.json()["command_id"]
while True:
res = requests.get(f"{BASE}/commands/{command_id}", headers=headers).json()
if res["status"] == "SUCCESS":
print("Thumb 1:", res["output_files"]["out_1"]["storage_url"])
print("Thumb 2:", res["output_files"]["out_2"]["storage_url"])
break
if res["status"] == "FAILED":
raise RuntimeError("Command failed")
time.sleep(2)
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": "thumbnail1.jpg", "out_2": "thumbnail2.jpg"},
"ffmpeg_command": "-i {{in_1}} -filter_complex \"[0:v]split=2[first][second];[first]select='\''gte(t,10)'\''[thumb1];[second]select='\''gte(t,20)'\''[thumb2]\" -map [thumb1] -frames:v 1 {{out_1}} -map [thumb2] -frames:v 1 {{out_2}}"
}'
curl --request GET \
--url https://api.rendi.dev/v1/commands/<command_id> \
--header 'X-API-KEY: <api-key>'
How the FFmpeg command works
split=2[first][second] — duplicate the video stream so we can select frames at two different timesselect='gte(t,10)'[thumb1] — pick the first frame at or after 10 sselect='gte(t,20)'[thumb2] — pick the first frame at or after 20 s-map [thumb1] -frames:v 1 {{out_1}} — write one frame to thumbnail1.jpg-map [thumb2] -frames:v 1 {{out_2}} — write one frame to thumbnail2.jpg
For N thumbnails, extend the split count and add another select + -map pair per output.
Response
{
"output_files": {
"out_1": {
"file_id": "eba1a713-...",
"size_mbytes": 0.085,
"file_type": "image",
"file_format": "jpg",
"storage_url": "https://storage.rendi.dev/temp_files/.../thumbnail1.jpg",
"width": 1280,
"height": 720
},
"out_2": {
"file_id": "d8278ca9-...",
"size_mbytes": 0.039,
"file_type": "image",
"file_format": "jpg",
"storage_url": "https://storage.rendi.dev/temp_files/.../thumbnail2.jpg",
"width": 1280,
"height": 720
}
},
"status": "SUCCESS",
"command_type": "FFMPEG_COMMAND"
}
