You can send a sequence of local video files from a spare Windows PC to YouTube Live with FFmpeg: make a compatible playlist, create a stream in YouTube Studio, feed FFmpeg the playlist and YouTube’s current ingest URL and stream key, then check the Live Control Room preview before going live. The exact command depends on your files, whether you want them to repeat, and the output your PC and internet connection can sustain; there is no safe one-command-fits-all setup.
What you need before you start
- A Windows PC that can stay on and has enough upload capacity and processing headroom for your chosen output.
- FFmpeg available in a Windows command prompt or PowerShell session.
- Local media files and a text playlist in the order you want them played.
- A YouTube channel able to create a live stream, plus its current server URL and stream key from YouTube Studio.
The sources cited here do not establish a particular Windows build, FFmpeg distribution, minimum PC specification, or installation procedure. Check the FFmpeg documentation for the build you install and test on the actual machine. YouTube’s encoder workflow is described at Create a YouTube live stream with an encoder.
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Prepare and check the video playlist
Create the concat list
FFmpeg’s concat demuxer reads a text file with one file directive per input. For example, save a plain-text file called playlist.txt alongside the videos:
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file 'clip-03.mp4'Use paths that resolve from the directory where you run FFmpeg; for paths with spaces, quote the full path. This is a local FFmpeg playlist, not a YouTube playlist URL. See the FFmpeg concat demuxer documentation.
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Check whether the files are compatible
The concat demuxer expects every file to expose the same streams, with matching codecs and time bases. Files with different stream layouts or encoding may need conversion or another workflow. FFmpeg also warns that inaccurate duration information can shift timestamps and create artifacts or gaps, especially when streams have different lengths. Inspect the files and test the assembled output rather than assuming a list of MP4 files is compatible merely because they share an extension.
You have two broad choices:
| Approach | When it fits | Trade-off |
|---|---|---|
| Stream-copy compatible inputs | The playlist files have matching streams and codecs, and their existing output characteristics suit the stream. | It avoids re-encoding, but does not fix incompatible sources or bad timing metadata. |
| Re-encode to a consistent output | Inputs differ, or you need a specific output resolution, frame rate, codec, or bitrate. | It adds CPU load; a spare PC may not sustain demanding settings. |
The right choice depends on the actual files and PC. There is no universal command that can be guaranteed to handle unknown media correctly.
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Create the YouTube live stream and protect its key
- Open YouTube Studio and go to Live Control Room.
- Create a new stream or schedule one, then open its stream settings.
- Copy the current server URL and stream key shown for that stream. Use the protocol YouTube currently presents or recommends in the Control Room.
- Keep the key private. YouTube describes stream keys as like a stream’s “password and address.” Do not place it in a public script repository, screenshot, or tutorial. If it may have been exposed, reset it in Live Control Room and update the encoder.
Follow YouTube’s current instructions at Create a YouTube live stream with an encoder and Manage live stream settings. Interface labels and available options can change.
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Choose FFmpeg output settings
Use YouTube’s current encoder guidance as the target, then choose settings that the source, PC, and upload connection can handle. YouTube lists H.264, H.265/HEVC, and AV1 among supported video codec options; it recommends constant bitrate encoding and a two-second keyframe interval, not exceeding four seconds. For audio, its guidance lists stereo AAC or MP3 options. These are platform recommendations, not a measurement of your hardware or connection. Consult Choose live encoder settings, bitrates, and resolutions for current details.
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- Do not select 4K or a high frame rate by default for an unspecified spare PC. Match the output to the video and to stable upload capacity.
- For re-encoding, set the video and audio codecs, resolution, frame rate, bitrate, and keyframe interval deliberately; do not rely on guessed values for unknown source media.
- For stream-copy, confirm that the existing codecs and stream layout are accepted for the chosen ingest setup and that the files are compatible with the concat demuxer.
- Check the installed FFmpeg build and the selected RTMP or RTMPS protocol syntax. YouTube recommends RTMPS; the exact command depends on your build and the current URL format in the Control Room.
YouTube automatically transcodes live input for viewer formats, but that does not remove the need to send an input your connection can sustain. YouTube’s YouTube live streaming tips recommend testing with representative audio and movement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Send the playlist from Windows with FFmpeg
- Open Command Prompt or PowerShell and change to the folder containing
playlist.txtand the video files, or use full paths in the playlist. - Choose whether this run is a single pass or must repeat. The concat demuxer processes listed inputs consecutively; the cited documentation does not establish a universal Windows looping command for unknown input formats. Validate your loop method against your installed FFmpeg documentation and media before relying on it for a long stream.
- Build the FFmpeg command for the selected input and output approach, using the playlist as input and the exact current YouTube ingest URL and stream key as output credentials. Add the codec and output settings appropriate to your source and connection. Do not publish a command containing a real key.
- Start FFmpeg and confirm it is sending data. Keep the PC awake, FFmpeg running, and network connection stable for the duration of a self-hosted stream.
- Open Live Control Room and wait for the incoming preview and stream health indicators. When the scheduled stream is ready, click Go live only after the preview appears.
Because the media properties, repeat behavior, stream key, ingest URL, and desired output are unknown, a fixed command would risk being wrong. Use FFmpeg’s concat documentation for the input form and YouTube’s current encoder instructions for the output configuration.
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Test, monitor, and end the stream
Run a test with representative movement and sound before using the setup for a public or scheduled stream. Start the encoder ahead of time, inspect the Live Control Room preview and stream health, and listen and watch for audio/video quality problems. YouTube’s guidance is at Choose live encoder settings, bitrates, and resolutions and YouTube live streaming tips.
For a scheduled stream, YouTube instructs creators to end the stream in Live Control Room and then stop the encoder output. YouTube says streams under 12 hours are automatically archived; do not count on automatic archiving for a longer stream. See Create a YouTube live stream with an encoder.
Troubleshoot common problems
| Symptom | Likely checks and fixes |
|---|---|
| The playlist stops, skips, or has gaps | Check every path in the text file, confirm files have matching stream layouts/codecs/time bases, and verify duration metadata. If inputs differ, convert them to compatible streams or use a workflow suited to the media. Test the sequence before going live; concat timestamp adjustment can create gaps when stream durations differ. |
| YouTube shows no preview | Confirm FFmpeg is sending output, then re-copy the server URL and key from the current stream settings. If the key may have been exposed, reset it in Live Control Room and update FFmpeg. |
| Video buffers or looks poor | Reduce resolution, bitrate, or frame rate to what the upload connection and PC can sustain. Check stream health in Live Control Room and test the representative scene again. There is no bandwidth or PC-performance measurement available for your particular setup. |
| FFmpeg errors when opening the list or an input | Check the playlist syntax, filename spelling, path quoting, and working directory. Then verify that the installed FFmpeg build can read the actual media formats. |
| A long-running loop is required | Do not assume a sequential concat list repeats by itself. Verify a looping arrangement for your exact FFmpeg build and inputs, and test it long enough to expose transitions and timestamp issues before depending on it. |
Or let it run in the cloud
If you want the channel to keep playing uploaded videos without leaving this PC on, StreamNeo is a cloud service for keeping a YouTube channel live 24/7 from uploaded videos. Upload a recording or build a playlist, add your YouTube stream key once, and go live. It loops the videos from the cloud, so nothing has to stay on at home. Every slot streams the upload as made, up to 4K 60fps, at one flat price per slot, with no re-encode or quality tiers; it also automatically recovers if YouTube drops the stream. The first day is free with no card. Monthly pricing is $9.99 per month. For Indian creators, UPI and cards are supported. Start the free day at StreamNeo.
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