FFmpeg sends your video to a MediaMTX path, and MediaMTX forwards that path to YouTube. YouTube’s current ingest URL and stream key come from the active stream’s settings in YouTube Studio; use RTMPS, keep both audio and video tracks in the forwarded feed, and test the complete route before relying on it.
How the stream gets from FFmpeg to YouTube
This setup has two separate connections: FFmpeg publishes to MediaMTX, then MediaMTX forwards the stream to YouTube. That separation makes it easier to locate problems: first confirm MediaMTX receives the FFmpeg feed, then check the forwarding destination and YouTube ingest.
- FFmpeg → MediaMTX: FFmpeg sends an RTMP stream to a MediaMTX path such as
mystream. - MediaMTX → YouTube: MediaMTX forwards that path to the current YouTube RTMPS ingest URL, combined with the stream key for the active YouTube stream.
This is useful for a game capture, recorded gameplay, or another supported input that FFmpeg can encode or relay. It does not make YouTube content policy requirements go away: use material you have the rights to stream, and do not assume that repeatedly broadcasting reused footage will qualify for monetization. YouTube’s live streaming help and channel monetization policies are the places to check current rules.
1. Create the YouTube stream and copy its current credentials
- In YouTube Studio, select Create → Go Live, then open the Stream tab.
- Copy the stream URL and stream key shown for the stream you intend to use. YouTube describes these as the server URL and key to enter in an encoder; the key identifies where the encoder should send the feed and allows YouTube to accept it. See YouTube’s encoder setup instructions.
- Keep the key private. Do not publish it in a screenshot, public configuration file, or log. If it is exposed, reset it in YouTube Studio and update MediaMTX’s forwarding destination.
Use the URL currently displayed in Studio rather than copying an old hostname from an example. YouTube’s ingest details can change, and the MediaMTX documentation explicitly treats its sample host as a historical example, not a guaranteed current destination.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
2. Publish an input to a MediaMTX path with FFmpeg
Install and run MediaMTX on the machine or host that FFmpeg can reach. Its RTMP listener uses port 1935 in the documented example. Substitute your real input file and MediaMTX hostname or IP as needed:
ffmpeg -re -stream_loop -1 -i file.mp4 -c copy -f flv rtmp://localhost:1935/mystream
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
-rereads a file at its native playback rate; it is appropriate for file playback, not a blanket requirement for every live input.-stream_loop -1repeats the file indefinitely.-c copycopies the input audio and video codecs rather than encoding them again. It works only if the source tracks are suitable for the receiving workflow. If they are not, choose an encoding configuration that YouTube currently supports rather than assuming stream copy will convert them.-f flvselects the FLV container used for this RTMP publishing example.rtmp://localhost:1935/mystreamtargets the local MediaMTX RTMP listener and path. Replacelocalhostif MediaMTX runs on another host, and keep the path consistent with the MediaMTX configuration.
For a live capture or another non-file source, use that source’s appropriate FFmpeg input and remove file-playback options that do not apply. The important checkpoint is that MediaMTX receives the intended audio and video tracks at the path you plan to forward.
3. Configure MediaMTX to forward the path to YouTube
In the matching MediaMTX paths entry, configure a forward destination for the YouTube stream. The destination pattern documented by MediaMTX is:
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
rtmps://<current-youtube-ingest-host>/<path>#<stream-key>
Replace the host and path with the values from the current YouTube Studio stream URL, and place the corresponding stream key after #. Use the current MediaMTX configuration syntax for your installed version; do not treat a sample host such as a.rtmp.youtube.com/live2 as a permanent endpoint. MediaMTX explains the forwarding pattern in its YouTube forwarding documentation.
RTMPS encrypts the connection in transit and is the recommended transport for the YouTube leg. Do not copy an old certificate fingerprint or disable certificate checking merely because an older documentation example mentioned a certificate issue: verify TLS behavior against the current endpoint and the MediaMTX version you are running.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
4. Confirm audio, video, and encoder compatibility
YouTube’s MediaMTX guidance says both audio and video tracks must be present; a video-only forwarded stream can be silently rejected. Preserve an audio track even if the program is intended to be silent. YouTube’s current encoder guidance supports RTMP/RTMPS and H.264, H.265, or AV1 video, frame rates up to 60 fps, AAC or MP3 audio, constant bitrate encoding, and a recommended two-second keyframe interval (not more than four seconds). See YouTube’s live encoder settings.
- Resolution and frame rate: Select a mode supported by the source and sustainable on the actual upload connection.
- Bitrate: YouTube recommends 5 Mbps for H.264 at 1080p30 and 8 Mbps at 720p60; its listed minimums for those modes are 5 Mbps and 3 Mbps, respectively. For AV1 or H.265, the recommendations are 10 Mbps at 1080p30 and 6 Mbps at 720p60. These are YouTube’s published recommendations, not a guarantee that a particular network or encoder will deliver a stable stream.
- Keyframes and rate control: Use CBR and a two-second keyframe interval where your encoder permits it; avoid intervals longer than four seconds.
- Audio: Verify the outgoing stream actually contains an AAC or MP3 audio track, including for silent content.
Higher resolutions, frame rates, or bitrates need more upload capacity. Leave headroom rather than setting the encoder at the full measured connection rate, then use YouTube’s stream-health feedback to judge the result.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
5. Test the entire path before a long broadcast
- Start FFmpeg and confirm that MediaMTX receives the stream at the intended path.
- Confirm MediaMTX’s forwarding destination uses the URL and key belonging to the active YouTube stream.
- Check YouTube Studio’s preview, stream health, and any warnings while representative motion and audio are playing.
- Only rely on the setup after the end-to-end test succeeds; a successful FFmpeg-to-MediaMTX connection alone does not prove that YouTube is receiving the forwarded stream.
Troubleshooting
| Symptom | Likely cause | What to check or change |
|---|---|---|
| No YouTube preview or ingest rejection | The forwarded feed may lack an audio track, even if video is present. | Inspect the tracks reaching MediaMTX and ensure both audio and video are forwarded. MediaMTX documents that video-only streams may be silently rejected. |
| MediaMTX receives FFmpeg, but YouTube does not | The output leg may have the wrong destination, path, or key. | Verify the FFmpeg input reaches the intended MediaMTX path, then compare the forwarding destination and key with the active stream settings in YouTube Studio. |
| The stream key no longer works or may be exposed | The key may have been reset, mismatched, or compromised. | Reset it in YouTube Studio, update the MediaMTX destination, and keep the replacement private. |
| Unstable ingest or poor quality | The selected bitrate may exceed what the upload connection can sustain, or the encoder settings may not suit the source. | Choose a sustainable mode and bitrate, run a representative test, and monitor YouTube’s stream-health messages. |
| TLS or certificate error | An old endpoint or certificate observation may no longer apply. | Check the current YouTube RTMPS URL and verify certificate behavior for the current endpoint and MediaMTX version. Do not copy an outdated exception blindly. |
Or let it run in the cloud
If your goal is to keep a YouTube channel live from uploaded gameplay or other recorded videos, rather than build and maintain this FFmpeg-to-MediaMTX relay, StreamNeo runs the loop in the cloud. Upload a recording or build a playlist, add your YouTube stream key once, and go live. Your computer and home connection do not have to stay on; each slot streams the upload as made, up to 4K 60fps, at one price per slot, with automatic recovery if YouTube drops the stream. The first day is free with no card. The monthly option is $9.99 per month.
Quick Recap
Start your free first day with StreamNeo.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
