> ## Documentation Index > Fetch the complete documentation index at: https://rendi.dev/docs/llms.txt > Use this file to discover all available pages before exploring further. # Trim a video into multiple resolutions in one call > Trim a video to a time range and simultaneously produce multiple resolutions in one FFmpeg call using Rendi. Node.js, Python, and cURL examples. Trim a video to a time range and simultaneously output multiple resolutions from the same input. One command instead of several — cheaper and faster because the input is decoded once. ## Code ```js theme={null} 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: "output_320p.mp4", out_2: "output_180p.mp4", }, ffmpeg_command: '-i {{in_1}} -ss 00:00 -to 00:30 -filter_complex "[0:v]split=2[vid1][vid2];[vid1]scale=trunc(oh*a/2)*2:320:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:320:-1:-1[320p];[vid2]scale=trunc(oh*a/2)*2:180:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:180:-1:-1[180p]" -map [320p] -map 0:a -c:a copy -c:v libx264 -preset medium {{out_1}} -map [180p] -map 0:a -c:a copy -c:v libx264 -preset medium {{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("320p:", data.output_files.out_1.storage_url); console.log("180p:", data.output_files.out_2.storage_url); break; } if (data.status === "FAILED") throw new Error("Command failed"); await new Promise((r) => setTimeout(r, 2000)); } ``` ```python theme={null} 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": "output_320p.mp4", "out_2": "output_180p.mp4", }, "ffmpeg_command": '-i {{in_1}} -ss 00:00 -to 00:30 -filter_complex "[0:v]split=2[vid1][vid2];[vid1]scale=trunc(oh*a/2)*2:320:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:320:-1:-1[320p];[vid2]scale=trunc(oh*a/2)*2:180:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:180:-1:-1[180p]" -map [320p] -map 0:a -c:a copy -c:v libx264 -preset medium {{out_1}} -map [180p] -map 0:a -c:a copy -c:v libx264 -preset medium {{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("320p:", res["output_files"]["out_1"]["storage_url"]) print("180p:", res["output_files"]["out_2"]["storage_url"]) break if res["status"] == "FAILED": raise RuntimeError("Command failed") time.sleep(2) ``` ```bash theme={null} curl --request POST \ --url https://api.rendi.dev/v1/run-ffmpeg-command \ --header 'Content-Type: application/json' \ --header 'X-API-KEY: ' \ --data '{ "input_files": {"in_1": "https://storage.rendi.dev/sample/sample.avi"}, "output_files": {"out_1": "output_320p.mp4", "out_2": "output_180p.mp4"}, "ffmpeg_command": "-i {{in_1}} -ss 00:00 -to 00:30 -filter_complex \"[0:v]split=2[vid1][vid2];[vid1]scale=trunc(oh*a/2)*2:320:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:320:-1:-1[320p];[vid2]scale=trunc(oh*a/2)*2:180:force_original_aspect_ratio=decrease,pad=trunc(oh*a/2)*2:180:-1:-1[180p]\" -map [320p] -map 0:a -c:a copy -c:v libx264 -preset medium {{out_1}} -map [180p] -map 0:a -c:a copy -c:v libx264 -preset medium {{out_2}}" }' curl --request GET \ --url https://api.rendi.dev/v1/commands/ \ --header 'X-API-KEY: ' ``` ## How the FFmpeg command works * `-ss 00:00 -to 00:30` — trim the video to the first 30 seconds * `split=2[vid1][vid2]` — duplicate the video stream so each copy can be scaled independently * `scale=...:320:...,pad=...:320:-1:-1[320p]` — scale first copy to 320 px tall, letterbox to maintain aspect * `scale=...:180:...,pad=...:180:-1:-1[180p]` — scale second copy to 180 px tall * `-map [320p] -map 0:a ... {{out_1}}` — first output: 320p video + original audio * `-map [180p] -map 0:a ... {{out_2}}` — second output: 180p video + original audio * `-c:a copy` — pass audio through unchanged for both outputs * `-c:v libx264 -preset medium` — re-encode each video with H.264 For N resolutions, extend the `split=N` and add another `scale...pad...[NNp]` stage plus output mapping. ## Response ```json theme={null} { "output_files": { "out_1": { "file_id": "f775b15d-...", "size_mbytes": 2.27, "duration": 30.0, "file_type": "video", "file_format": "mp4", "storage_url": "https://storage.rendi.dev/temp_files/.../output_320p.mp4", "width": 568, "height": 320, "codec": "h264" }, "out_2": { "file_id": "9df00eca-...", "size_mbytes": 1.05, "duration": 30.0, "file_type": "video", "file_format": "mp4", "storage_url": "https://storage.rendi.dev/temp_files/.../output_180p.mp4", "width": 320, "height": 180, "codec": "h264" } }, "status": "SUCCESS", "command_type": "FFMPEG_COMMAND" } ``` ## Related * [Trim a clip](/examples/trim-clip) * [Resize video](/examples/resize-video) * [Cheatsheet — Resizing and padding](https://github.com/rendi-api/ffmpeg-cheatsheet#resizing-and-padding)