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You can stream a local playlist from a Mac mini to YouTube Live without a new encode if the video and audio streams in every file are compatible. Use FFmpeg’s concat demuxer with -c copy, which passes through the existing encoded streams. It will not fix mismatched codecs, stream layouts, or timing; inspect and test the files before relying on this method.
What you need before you start
- A YouTube channel eligible to live stream, with live streaming enabled. YouTube says first-time enablement may take up to 24 hours, so do not leave activation until event time. Check the current status and any channel restrictions in YouTube Studio. YouTube: Get started with live streaming
- A Mac mini with FFmpeg installed and a build that supports the protocol you plan to use. The cited YouTube and FFmpeg guidance does not specify a minimum Mac mini generation or macOS version.
- Local video files in the order you want them played, with compatible encoded audio and video streams.
- A reliable internet connection whose available upload capacity exceeds the total bitrate you will send. YouTube recommends 20% headroom above the stream bitrate. YouTube: Tips for live streaming
1. Create the YouTube Live event and protect its key
- In YouTube Studio, open Create > Go live to enter Live Control Room, then create or schedule an encoder-based stream.
- In the event’s stream settings, copy the stream URL and stream key. The key gives access to your stream, so treat it like a password. Do not publish it, add it to a public repository, or share it in a playlist file or screenshot. YouTube documents resetting a key in Live Control Room if it may have been exposed. YouTube: Set up your encoder for live streaming
- Set the event’s privacy level—public, private, or unlisted—and check that the media is cleared for public performance and distribution. You remain responsible for audio and video rights and compliance with YouTube’s Community Guidelines.
2. Check whether your files can be joined without encoding
FFmpeg’s concat demuxer reads an ordered list of files; it is not a playlist uploaded to YouTube. With compatible inputs, -c copy asks FFmpeg to pass through the existing encoded packets instead of decoding and encoding them again.
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Stream copy is conditional. The files need compatible stream structure and codecs, as well as timing that works for concatenation. It cannot convert codecs, resize video, change frame rate, add overlays, or reconcile incompatible tracks. Do not assume that files with the same .mp4 extension are compatible: the container extension alone does not establish that their underlying streams match. Inspect the files and test the complete sequence before scheduling an important event. If their streams do not line up, create a consistent intermediate encode or use a workflow that re-encodes.
Create the ordered concat list
Make a plain-text file named playlist.txt in a convenient location. Add one file line per video, in playback order, using the actual paths:
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file '/path/to/first.mp4'
file '/path/to/second.mp4'Keep this file private if it contains sensitive local paths. It should contain media paths, not your YouTube stream key.
3. Send the playlist to YouTube with FFmpeg
Open Terminal on the Mac mini, change to the directory containing playlist.txt if needed, and run the command below. Replace the placeholder with the current ingest URL and key copied from the event settings; never publish or share the completed command if it contains the real key.
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ffmpeg -re -f concat -safe 0 -i playlist.txt -c copy -f flv 'YOUTUBE_INGEST_URL_AND_STREAM_KEY'-rereads the file input at real-time playback speed rather than sending it as fast as possible.-f concatselects FFmpeg’s concat demuxer, and-i playlist.txtsupplies the ordered local list.-safe 0permits the example’s file paths, including absolute paths. Use it only with a list you trust; the option relaxes path-safety checks.-c copyrequests stream copy: no new audio or video encode is performed when the input streams and output are compatible.-f flvselects the example’s RTMP-style output container. The command is a starting point, not a guarantee that every combination of source container, stream, and FFmpeg build will work unchanged.
Use the ingest destination shown in Live Control Room rather than assuming a fixed URL. Confirm that the installed FFmpeg build supports the selected RTMP or RTMPS protocol and that the destination format accepts the streams in your files.
4. Preview, start, and monitor the event
- After FFmpeg connects, wait for the incoming signal and preview to appear in Live Control Room.
- Check the picture and sound in the preview. If the event is set for manual start, select Go live only after the preview looks right. YouTube recommends testing ahead of time and monitoring stream quality. YouTube: Tips for live streaming
- Keep the Mac mini, FFmpeg process, and network connection available for the duration. A computer restart, FFmpeg crash, or network outage can interrupt this DIY setup; the cited guidance does not establish automatic recovery for those failures. Arrange supervision and a restart/reconnection plan if continuity matters.
YouTube says streams under 12 hours are automatically archived. That statement should not be extended to streams lasting 12 hours or more. YouTube: Archive live streams
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Which workflow fits your files?
| Route | Re-encodes? | Input tolerance and trade-off | Separate device or service? |
|---|---|---|---|
| FFmpeg concat with stream copy | No, when compatible source packets can be copied. | Best when files have compatible streams; cannot normalize differences or add production effects. | Requires the Mac mini and its connection to remain available. |
| Software encoder with a re-encoding workflow | Yes. | Can normalize disparate inputs and support production features, but requires an encode and suitable compute and bitrate settings. The cited material does not establish a tested OBS configuration. | Requires an available computer running the encoder. |
| Standalone hardware encoder | Not established for the cited feature. | YouTube lists AJA HELO Plus and says its optional PlayToStream feature can schedule prerecorded media directly to YouTube Live; that does not establish that this route avoids encoding. YouTube: Set up your encoder for live streaming | Hardware route; it is not required for the Mac mini method. |
Or let it run in the cloud
If you want a YouTube playlist to keep running without leaving the Mac mini on, StreamNeo is a cloud service for looping uploaded videos as a 24/7 YouTube Live stream. The setup is: upload a recording or build a playlist, add your YouTube stream key once, then go live. Your computer and home connection do not have to stay on.
StreamNeo streams the uploaded files as made, up to 4K 60fps, at one flat price per slot with no re-encode or quality tiers. It includes automatic recovery if YouTube drops the stream. The first day is free with no card (one free day per account). The monthly option is $9.99 per month. Each slot includes 10 GB storage, pooled across active slots, plus 24/7 looping, playlists, and StreamNeo team support. See StreamNeo for details and plan lengths. UPI and cards are available in India; card checkout is available worldwide. For five or more slots, contact support.
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