To loop a prerecorded video into YouTube Live from Google Cloud, create a YouTube live event, prepare a Compute Engine VM that can sustain your chosen FFmpeg workload and outbound bitrate, then run FFmpeg with -stream_loop -1 and file-input pacing. The exact VM cannot be chosen safely without knowing whether you can copy the source streams or must re-encode them—and testing the actual VM, route and file is essential.
Before you start: decide whether FFmpeg will copy or encode
Inspect the media file and decide whether its existing video and audio streams are suitable for YouTube’s ingest requirements. If they are, stream-copying avoids a new encode. If they are not—or if you need to change the codec, resolution, frame rate or bitrate—FFmpeg must encode the output. Encoding a 4K60 stream can impose substantially different compute demands from copying compatible streams.
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No single Google Cloud machine type is established as sufficient for every source file and encoding workload. The required capacity depends on the input, output codec and settings, and whether encoding is CPU- or GPU-assisted. Choose a candidate VM and test it with the representative file and command before relying on it.
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- In YouTube Studio, create or schedule the live stream and open its stream settings. YouTube provides a stream URL and stream key for the encoder.
- Configure FFmpeg to send the stream to YouTube’s ingest URL using the key. Treat the key like a password: do not publish it, place it in a public script or share terminal output that exposes it. If it is compromised, reset it in YouTube Studio. See YouTube’s stream settings guidance.
- Use RTMPS where available, as YouTube recommends. Confirm that the event is ready to receive the encoder before starting FFmpeg.
Choose the ingest settings for 2160p60
YouTube’s encoder guidance supports H.264, H.265/HEVC and AV1, recommends constant bitrate (CBR), allows up to 60 fps, and recommends a two-second keyframe interval, not exceeding four seconds. Select settings from the current YouTube guidance row for the codec you actually send; the bitrate is codec-specific, not a universal 4K60 figure.
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For H.264 at 2160p60, YouTube’s current Help guidance accessed October 3, 2026 lists 35 Mbps as the recommended setting. That is a recommendation for this codec and resolution/frame-rate combination, not a promise that a VM or network route will sustain it. Verify YouTube’s live encoder settings, bitrates and resolutions before configuring the stream.
Run the prerecorded file as a real-time loop
FFmpeg’s -stream_loop -1 input option repeats an input indefinitely. For a file intended to be sent as a live stream, -re paces reading at the file’s native frame rate; FFmpeg documents it as equivalent to -readrate 1. Place these input options before the matching -i. Output options depend on your source and whether you copy or encode.
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ffmpeg -re -stream_loop -1 -i /path/to/video.mp4 [output options] -f flv "rtmps://INGEST_URL/STREAM_KEY"This is a command shape, not a complete universal command: replace the file path and ingest URL/key, and supply output options that match the chosen codec and source. Do not assume that copying the source is valid without checking its codecs and stream properties, or that a particular encode will run in real time on an untested VM. Keep the stream key out of shell history and logs where possible.
FFmpeg cautions against using low read rates with a live stream or capture device because packet loss may result. That warning matters if you adapt this command to a live input; the workflow here uses a prerecorded file. See the FFmpeg command-line documentation for the definitions of these options.
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Select a VM and verify sustained outbound throughput
A successful connection at startup does not prove that the VM can maintain the selected bitrate. Google Cloud documents external egress limits that depend on the VM and applicable per-instance, per-flow and project-level limits. Published limits are ceilings, not guaranteed throughput for a particular stream or route. Compare the sustainable egress available to your VM with the bitrate you intend to send, allowing practical headroom rather than sizing exactly to the target.
There is no universally optimal VM type or region established for this task. The right choice depends on source media, stream-copy versus transcode, codec, target rate, region and runtime. Test the actual configuration under representative load and consult Google Cloud’s VM network bandwidth documentation.
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Estimate the full Google Cloud cost
Budget for the deployed configuration and the entire time it runs, not just the VM’s headline compute rate. Compute Engine prices compute separately from other possible charges; an attached GPU is billed in addition to the machine type, and internet data transfer out is priced separately. Disks and region also affect the total.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors- Estimate the selected VM in the intended region with the Google Cloud pricing calculator.
- Include any attached accelerator using GPU pricing; a GPU is an additional charge, not a substitute for VM compute charges.
- Account for internet data transfer out and applicable network pricing using VPC pricing.
- Check the applicable egress limits alongside cost; a cheap configuration is not useful if it cannot sustain the stream.
Because machine family, region, disk, duration and encoding workload are unspecified, a reliable flat cost cannot be given. Recheck current prices, quotas and machine availability when deploying.
Test the stream before leaving it unattended
- Use the actual video, output settings, VM and network route planned for the continuous stream.
- Start the event as a test and confirm that YouTube receives the expected resolution, frame rate, audio and bitrate.
- Watch YouTube’s stream health indicators and messages while the stream runs. Look for dropped frames, unstable bitrate, encoder overload or ingest warnings.
- Confirm that the loop returns to the beginning cleanly and that the event remains healthy across the transition. YouTube recommends testing with representative audio and movement; it also transcodes received streams into multiple playback formats.
YouTube’s advice is direct: “We recommend testing before you start your live stream.”
Troubleshooting common failures
| Symptom | Likely area to check | What to do |
|---|---|---|
| FFmpeg connects, but YouTube reports poor stream health or drops frames | The VM or route may not sustain the selected bitrate; encoding may also be too demanding. | Check YouTube’s messages and FFmpeg output, then test a representative run. Verify egress constraints and workload capacity before changing the bitrate or VM. |
| YouTube rejects the stream or reports settings that do not match the event | Codec, bitrate, frame rate, keyframe interval, ingest URL or stream key may be wrong. | Compare the actual encoder output with the current codec-specific YouTube settings, verify the event’s stream URL/key, and use the recommended two-second keyframe interval (no more than four seconds). |
| The file plays too quickly or the output does not behave like a live feed | File input is not being paced in real time. | For a prerecorded file, put -re before its -i input. Use -stream_loop -1 before that input to repeat it indefinitely. |
| FFmpeg cannot keep up after encoding begins | The selected VM may not have enough capacity for the chosen encode. | Test stream-copying if the source streams already meet the output requirements, or benchmark a more suitable VM/encoding configuration. Do not assume a GPU or general-purpose VM is sufficient without testing. |
| The stream key may have been exposed | Credential handling or a shared log/script exposed the key. | Reset the key in YouTube Studio and update the encoder configuration. Keep replacement credentials private. |
Or let it run in the cloud
If you want a YouTube loop without keeping a VM or home computer running, StreamNeo is a cloud service that loops uploaded videos to YouTube. Upload a recording or build a playlist, add your YouTube stream key once, and go live. It is a different workflow from managing FFmpeg on Compute Engine.
Quick Recap
- Nothing has to stay on at home; the stream runs from the cloud.
- Each slot streams the uploaded quality as made, up to 4K 60fps, at one flat price per slot, with no re-encode or quality tiers.
- It automatically recovers if YouTube drops the stream.
- The first day is free with no card required, one free day per account.
- The monthly plan is $9.99 per month.
Start your free StreamNeo day.
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