Create a plain-text FFmpeg concat file that lists your local video clips in order, then have FFmpeg read it and send the output to YouTube Live. The playlist file contains media paths—not your YouTube stream key. This guide covers the local concat workflow, compatibility checks, the YouTube connection, and when a cloud service is a better fit for continuous playback.
Create the FFmpeg concat playlist
Save a text file in the directory containing your media. For example, name it playlist.ffconcat and use this format:
ffconcat version 1.0
file 'clip-01.mp4'
file 'clip-02.mp4'
file 'clip-03.mp4'The first line must be exactly ffconcat version 1.0, with no leading spaces or byte-order mark, for FFmpeg to auto-detect the format. Add one file line for each input; the demuxer reads them in that order. Paths may be relative to the playlist file or absolute. Follow FFmpeg’s quoting and escaping rules for spaces and special characters, and carefully test paths containing apostrophes or other troublesome characters. See the FFmpeg concat demuxer documentation.
Check the file before streaming
- Confirm the header is the first bytes in the file and has no hidden byte-order mark.
- Check spelling, capitalization, and path for every listed file.
- Keep the playlist limited to trusted paths. If your command uses
-safe 0, FFmpeg relaxes path safety checks; do not use that option with an untrusted playlist. - Check the local build’s supported options with
ffmpeg -h demuxer=concat.
Check whether the clips can be concatenated directly
The concat demuxer joins packet streams and adjusts timestamps so each file follows the preceding file’s duration. Direct concatenation is most suitable when the clips have compatible stream structures, codecs, time bases, and related parameters. Sharing an .mp4 extension is not enough to establish compatibility. FFmpeg’s documentation also notes that duration estimates can affect timestamps: inaccurate durations may introduce gaps or artifacts. If you know a reliable duration, a duration directive can override the stored value.
#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.
| Situation | Workflow to consider | Trade-off |
|---|---|---|
| Inputs have compatible streams and you want to avoid re-encoding | Concat demuxer | Depends on compatible stream parameters and reliable durations. |
| Inputs are incompatible, or you need to normalize their output | Re-encode with a filter-based workflow, such as the concat filter where appropriate | Requires encoding rather than packet-level joining. |
FFmpeg’s concatenation FAQ distinguishes the demuxer from the filter on this basis. Inspect the actual streams and test the complete sequence before relying on it for a live broadcast.
Send the playlist output to YouTube Live
A general command pattern is ffmpeg -re -f concat -safe 0 -i playlist.ffconcat ..., followed by the encoding, muxing, and RTMP output settings appropriate to your FFmpeg build and the stream configuration. This is illustrative, not a tested, copy-and-run command: the correct codecs, bitrate, keyframe interval, and output URL depend on your setup. Check your installed FFmpeg help and YouTube’s current encoder guidance before streaming.
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.
- Open YouTube Live Control Room. Create or open the live stream you intend to use.
- Copy the server URL and stream key. Use these values in the encoder’s private output configuration, not in the concat playlist.
- Start the FFmpeg encoder. Monitor its output for input, timestamp, encoding, and connection errors.
- Check the Live Control Room preview. For a scheduled stream, review the preview and click Go live when ready.
- Keep the key private. Do not publish it in a script repository, screenshot, playlist, or log. If it is exposed, replace it in YouTube’s controls before using it again.
YouTube’s encoder setup guidance describes the server URL and key workflow. It also says streams under 12 hours are automatically archived; platform policies can change, so check the current Help page when planning an archive or a longer broadcast.
Looping and keeping the broadcast running
The example playlist lists each clip once. To repeat playback indefinitely, a common FFmpeg approach is to loop the concat input, for example by adding -stream_loop -1 before the input option. Verify that your installed FFmpeg supports the option and test the resulting timestamps and transitions with your files. A successful local loop does not by itself guarantee an uninterrupted YouTube connection: monitor the encoder and Live Control Room, and plan for what happens if the process or connection stops.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteRank #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.
Do not confuse a concat file with an HLS playlist
An FFmpeg concat file is a local text script that names media files for the concat demuxer. YouTube HLS ingestion is a different network protocol with its own segment and playlist requirements. YouTube’s HLS setup guidance specifies TS segments, a rolling playlist with no more than five outstanding segments, and notes that HLS has higher latency than RTMP. Those HLS requirements do not apply to the local concat file in this tutorial.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| FFmpeg does not recognize the concat format | The header is misspelled, has leading whitespace, or has a byte-order mark. | Make ffconcat version 1.0 the exact first line and save the file without a byte-order mark. |
| A file cannot be opened | A path is wrong, relative to an unexpected directory, or incorrectly quoted/escaped. | Verify each path and test special characters using FFmpeg’s documented syntax. Check the current working directory if using relative paths. |
| Clips fail to join cleanly or show gaps | Stream structures, codecs, time bases, or durations differ. | Inspect the inputs. Use the demuxer only for suitable streams; consider a filter-based re-encoding workflow for incompatible media. Verify any duration override against a reliable duration. |
| FFmpeg rejects a path as unsafe | The concat demuxer’s safety checks reject the path format. | Prefer simple trusted relative paths. Only relax checks with -safe 0 when every playlist entry is trusted. |
| YouTube does not receive the encoder output | The output configuration may use the wrong server URL or key, or the connection may have failed. | Compare the private encoder settings with the values in Live Control Room and inspect FFmpeg’s connection output. Keep the key out of public logs and files. |
Or let it run in the cloud
If the goal is an always-on YouTube loop, StreamNeo is an alternative to keeping a local FFmpeg process running: upload your recording or build a playlist, add your YouTube stream key, and go live. Nothing has to stay on at home; it streams uploaded videos to YouTube, at the quality you provide up to 4K 60fps for one flat price per slot, with automatic recovery if YouTube drops the stream. The first day is free with no card. Monthly pricing is $9.99 per month. See StreamNeo or start the free first day.
Quick Recap
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.
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
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.
