To loop a prerecorded video to YouTube Live from a Google Cloud VM, create a YouTube live event, keep the stream key private, and run FFmpeg with the file-loop option -stream_loop -1 and real-time pacing with -re. Choose stream copy only when the source already matches the output requirements; otherwise encode it with settings suited to YouTube’s current codec guidance. A 4K60 stream also needs a VM and network route that can sustain the chosen bitrate. No single VM type is established as sufficient for every source and encoding workload, so test the complete setup before relying on it unattended.
Before you start: source, event, and cloud requirements
Inspect the media file
Check the file’s video and audio codecs, resolution, frame rate, and audio format before choosing an FFmpeg output. If the streams are already compatible with the output you intend to send, stream copy may avoid a costly real-time transcode. If they are not, FFmpeg must encode them, and the required compute capacity depends on the source, codec, settings, and workload. The available guidance does not establish a generally sufficient Google Cloud machine type or GPU for an unspecified file.
Create the YouTube Live event
In YouTube’s live-control workflow, create or schedule the event, then open its stream settings and obtain the ingest URL and stream key. Enter those credentials in FFmpeg’s destination. Treat the key like a password: anyone who has it may be able to send a feed to your event. If it is exposed, reset it in YouTube’s stream settings before continuing. See YouTube’s stream settings guidance.
Check VM access and egress
Provision a Compute Engine VM in the region you plan to use, install FFmpeg, and make sure it can reach YouTube’s ingest endpoint over RTMPS. Confirm that the VM, project quotas, firewall policy, and route permit sustained outbound traffic. Google Cloud describes VM egress limits as dependent on machine and applicable per-instance, per-flow, and project-level limits; a published ceiling is not a guarantee that your chosen stream will run at that rate. See Compute Engine network bandwidth.
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Choose stream copy or real-time encoding
When stream copy may work
Stream copy passes the input audio and video through without re-encoding. It is appropriate only when the source’s codecs and characteristics are acceptable for the YouTube ingest settings you intend to use. It does not convert an unsuitable codec, resolution, frame rate, or bitrate into a suitable one.
When to encode
Re-encode when you need a different codec or output characteristics, such as a specific 2160p60 H.264 output. Encoding at 4K60 can be demanding; validate actual CPU or GPU performance with your file and chosen settings. Do not assume that a general-purpose VM or an attached GPU is sufficient without a representative test.
Set YouTube-compatible 4K60 output settings
YouTube’s encoder guidance recommends RTMPS and supports H.264, H.265/HEVC, and AV1; select the recommendation for the codec you actually send. For H.264 at 2160p60, YouTube’s current Help table gives a recommended bitrate of 35 Mbps. That is a codec-specific recommendation, not a universal bitrate for HEVC or AV1. YouTube also specifies constant bitrate (CBR), up to 60 fps, and a two-second keyframe interval that must not exceed four seconds. Consult YouTube’s live encoder settings, bitrates, and resolutions before launch because its applicable codec rows and guidance may change.
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Use the RTMPS ingest URL supplied for your event, not a guessed endpoint. Add the stream key in the destination URL in the format required by that endpoint, and avoid placing the key in shell history, shared logs, or a public script. Test with representative motion and audio; YouTube recommends testing before a live stream and monitoring stream health and messages while it runs. YouTube transcodes received streams into multiple playback formats, so viewers may not see the source resolution immediately.
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Basic loop with stream copy
For a compatible source, the general command shape is:
ffmpeg -stream_loop -1 -re -i "/path/to/video.mp4" -c:v copy -c:a copy -f flv "rtmps://INGEST_URL/STREAM_KEY"
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Replace the file path and destination with your own values. The ingest URL and key must match the YouTube event. FFmpeg’s -stream_loop -1 loops the input indefinitely. Its -re option reads file input at its native frame rate, equivalent to -readrate 1, which is useful to pace file output in real time. These are input options, so place them before the relevant -i. See the FFmpeg command-line documentation.
The example is a command shape, not a guarantee that a particular file will be accepted. If stream copy fails because the source is not compatible with the ingest format or requirements, choose a suitable encoding path rather than assuming the same command can transform it.
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Encoding path
For an H.264 2160p60 encode, the output needs to be configured for the source and YouTube’s current H.264 recommendations: CBR, the applicable bitrate target (35 Mbps in YouTube’s guidance for this resolution and frame rate), and a two-second keyframe interval, never over four seconds. Exact FFmpeg codec and hardware-acceleration options depend on the encoder available on the VM and the input file; the official guidance cited here does not establish one universal encoding command or VM configuration. Confirm the encoded output’s resolution, frame rate, bitrate behavior, keyframe spacing, and audio in a test event before using it for an unattended loop.
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Do not use file pacing for live capture
-re is useful here because the input is a prerecorded file. FFmpeg cautions against low read rates with an actual capture device or live stream because packet loss may result. If you adapt the command to a live input, reconsider the pacing option rather than carrying it over automatically.
Test the stream and run it unattended
- Start a test event or test stream. Use the same VM, source file, FFmpeg command, codec, bitrate, and destination path planned for the real run.
- Check stream health in YouTube Studio. Watch for ingest warnings, dropped frames, or audio/video problems, and review YouTube’s messages while the test is active.
- Check the VM during the test. Confirm encoding load (if transcoding), sustained outbound throughput, and that FFmpeg remains running. Test long enough to reach the end of the file and verify that playback returns to the beginning.
- Correct failures before leaving it unattended. Lower or change the encode workload if the VM cannot encode in real time; investigate route, quota, and egress constraints if outbound delivery falters. Re-test after changes.
FFmpeg running in a terminal is not by itself a restart strategy. For unattended operation, use a process supervisor or system service appropriate to your VM, arrange logs you can inspect, and decide how you will restart the process after a VM reboot. Keep the stream key out of world-readable service files and logs. YouTube can automatically recover playback formats from a received stream, but that does not remove the need to monitor whether your encoder and VM are still sending.
Troubleshooting common failures
YouTube does not receive a signal
- Verify that the live event is in the expected state and that you copied its current ingest URL and stream key correctly.
- Check that the VM can reach the RTMPS endpoint and that its firewall and network policy permit outbound traffic.
- If the key may have been exposed or changed, reset or recopy it from YouTube’s stream settings.
The stream is unstable or drops frames
- For encoding, check whether the VM can sustain the workload in real time. A 4K60 transcode may exceed the capacity of a selected machine.
- For either copy or encode, compare actual sustained outbound delivery with the selected codec’s bitrate recommendation and check applicable Google Cloud egress and quota limits.
- Use YouTube’s stream-health messages to distinguish ingest problems from encoding or source issues; a documented bandwidth maximum is not proof of achievable throughput on your VM and route.
The video is rejected or does not appear as 4K60
- Confirm the source properties and whether the command is copying or encoding. Copy mode cannot make a source into 2160p60.
- Check that the selected codec’s output settings match the relevant YouTube guidance, including CBR and keyframe interval.
- Allow for YouTube’s processing of received streams into playback formats, and use a test stream to verify what the event actually accepts.
The loop stops at the end of the file
- Check that
-stream_loop -1is present before the input’s-ioption and that FFmpeg is not exiting due to an input, output, or network error. - Inspect FFmpeg’s logs and YouTube stream health; infinite input looping does not recover a failed process or network connection by itself.
Estimate the complete Google Cloud cost
There is no defensible single cost for this setup without a region, machine family, disk, encoding workload, stream duration, and current pricing. Compute Engine VM charges are separate from categories such as disks and networking; an attached GPU is charged in addition to the machine type, and internet data transfer out is a separate VPC pricing component. Estimate the full configuration and duration using current regional rates rather than a headline VM price. Review Compute Engine pricing, GPU pricing, and VPC network pricing. The lowest-cost VM that sustains your actual command cannot be identified without testing the representative source and workload.
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Or let it run in the cloud
If your goal is simply to keep prerecorded video live on YouTube, StreamNeo is an alternative to managing a VM and FFmpeg: upload a recording or build a playlist, add your YouTube stream key once, and go live. It loops uploaded videos in StreamNeo’s cloud, so nothing has to stay on at home; it supports whatever quality you upload up to 4K 60fps at one flat price per slot, with automatic recovery if YouTube drops the stream. The first day is free with no card. Monthly service is $9.99 per month. It is for prerecorded videos and YouTube streaming, not camera broadcasting. See StreamNeo or start the free first day.
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