To loop a prerecorded video as a YouTube Live stream from a Compute Engine virtual machine, run FFmpeg with -stream_loop -1 before the input file and -re before that same input so it is read at its native frame rate. Send the output to the stream URL and key shown in YouTube Live Control Room, preferably over RTMPS. The loop can continue only while the VM and FFmpeg process remain running and connected.
What you need before you start
- A YouTube channel eligible to live stream. YouTube’s requirements include channel verification, no live-streaming restrictions in the preceding 90 days, and a minimum age requirement; check the current YouTube eligibility rules for the account and location.
- A prerecorded video file on the VM, or a way to place it there.
- FFmpeg installed on the VM and an active Compute Engine instance with enough CPU capacity for the chosen output workflow.
- A stream URL and stream key from YouTube Live Control Room. Treat the key like a password; reset it if it is exposed.
- A network connection with sufficient sustained outbound capacity for the stream.
This guide shows the FFmpeg and YouTube portions of the setup. It does not prescribe a Compute Engine machine type, region, or price: those depend on whether you copy or transcode, the source and output formats, bitrate, and runtime. Check current Google Cloud machine and pricing information before choosing an instance.
Prepare the YouTube live stream
- Open YouTube Live Control Room and create or select the encoder stream. Confirm the channel is eligible and complete any required setup or verification.
- Open the stream’s encoder settings and copy its server URL and stream key. Use the URL supplied for this stream rather than a hard-coded endpoint. YouTube’s encoder setup guide explains where these values are used.
- Where supported, choose the RTMPS ingest URL displayed in Live Control Room. RTMPS encrypts the connection; YouTube’s RTMPS instructions explain how to reveal it and troubleshoot connection details. If YouTube’s troubleshooting guidance calls for it, use the correct RTMPS host and port 443.
- Keep the stream private or unlisted while you test. You will be able to inspect the incoming picture, sound, and stream-health messages in the control room before making it public.
Choose whether FFmpeg copies or transcodes
First determine what the file contains. The appropriate command depends on the source’s codecs, audio/video streams, container, and whether those codecs and settings meet YouTube’s current ingest requirements. YouTube’s encoder settings list RTMP/RTMPS as ingest protocols and H.264, H.265/HEVC, or AV1 video with AAC or MP3 audio options. Use that current page to verify compatibility rather than assuming every file can be sent unchanged.
- Copying: When the source streams are already suitable, FFmpeg can pass them through without re-encoding. This reduces processing compared with transcoding, but does not correct incompatible codecs or settings.
- Transcoding: When the source is unsuitable, specify output codecs and encoding settings that meet YouTube’s current requirements. Transcoding requires more CPU capacity; select a VM only after considering the workload and sustained runtime.
Run an infinite, real-time loop with FFmpeg
The essential options are -stream_loop -1 and -re. FFmpeg defines -1 as infinite looping, and -re reads an input at its native frame rate. Both are input-related options, so put them before the input file they apply to. The FFmpeg documentation explains these options at ffmpeg.org/ffmpeg.html.
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A command template for copying compatible streams is:
ffmpeg -re -stream_loop -1 -i "/path/to/video.mp4" -c:v copy -c:a copy -f flv "RTMPS_URL/STREAM_KEY"
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Replace the file path and destination with your own values. Use the exact RTMPS server URL and key from Live Control Room in the format required by that destination; the combined destination shown is a placeholder template, not a YouTube endpoint. Avoid putting a real key in screenshots, shell history you share, logs, or public scripts.
If stream copying is not compatible with the source or YouTube’s current ingest settings, replace the copy options with explicit video and audio encoding options appropriate to your file and the current YouTube table. Do not treat one bitrate as universal: YouTube separates recommendations and maximums by resolution, frame rate, and codec. For example, its current help table lists 720p at 30 fps as 2 Mbps recommended and 6 Mbps maximum for H.264, while H.265/AV1 at that resolution and frame rate has a 3 Mbps recommendation and 8 Mbps maximum. Check the live table for the exact combination you intend to send.
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When the process starts, FFmpeg should report input streams and begin sending output rather than rapidly consuming the file. Leave the terminal session or service running; closing the session or stopping the process ends the feed.
Set bitrate, keyframes, and network headroom
- Bitrate: Follow YouTube’s current encoder-settings table for the selected resolution, frame rate, and codec. The figures are YouTube recommendations and limits, not guarantees of quality on a particular connection.
- Rate control: YouTube recommends constant bitrate encoding.
- Keyframes: YouTube recommends a two-second keyframe interval and says not to exceed four seconds.
- Upload capacity: YouTube recommends leaving 20% upload-bandwidth room. This is planning headroom, not a reliability guarantee. Check the VM’s outbound capacity and account for other traffic on the connection.
- Audio: Use an audio codec listed as supported by YouTube and check the current documentation for its surround-sound caveat.
YouTube transcodes incoming live video into multiple playback formats. That does not remove the need to send a compatible, stable encoder feed.
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Test the stream before publishing
- Start FFmpeg while the stream is private or unlisted.
- Wait for the Live Control Room preview and inspect picture, audio, and stream-health messages.
- Listen for audio gaps or clipping and look for frozen, black, or unexpectedly scaled video.
- Check that the VM’s sustained outbound rate has room above the configured stream bitrate, including any other traffic.
- Only make the stream public after the preview and health indicators are satisfactory.
For scheduled events, YouTube’s live-streaming tips recommend setting up the encoder at least two hours in advance and starting it at least 15 minutes before the event.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep the Compute Engine process running
A loop flag repeats the input; it does not supervise FFmpeg, restart a stopped VM, or reconnect an expired or rejected stream. For unattended operation, arrange for the VM to remain on and for the process to be started and monitored by your chosen operating-system service or process manager. The details depend on the VM’s operating system and deployment, so test a restart and confirm the process resumes as intended before relying on it.
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Keep the stream key out of source repositories and public logs. Use a protected configuration or secret mechanism appropriate to your VM, restrict access to the instance, and rotate the key in YouTube if you suspect it was disclosed. Review the VM’s logs and YouTube stream-health messages if the feed stops.
Know YouTube’s archive and content rules
YouTube says streams under 12 hours are automatically archived; this is an archive rule, not a promise of uninterrupted playback or indefinite availability. Longer continuous broadcasts may not be archived, so plan separately if you need a recording.
Having permission to upload a file does not by itself guarantee that a live broadcast is allowed or eligible for monetization. Check the rights for every video and audio track, and review YouTube’s current copyright, live-streaming, and monetization policies—particularly if the material is reused or licensed with limits. The copyright safety checklist can help organize those checks.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| YouTube receives no video | Wrong server URL or key, a connection failure, or FFmpeg not sending output. | Copy the current URL and key from Live Control Room, check FFmpeg’s connection output, and confirm the VM can reach the ingest host. If using RTMPS, verify the RTMPS host and port details in YouTube’s troubleshooting instructions. |
| The stream connects but YouTube reports an error | Codec, audio, bitrate, or keyframe settings may not match current ingest guidance. | Compare the actual FFmpeg output settings with YouTube’s current encoder settings. Check the correct row for codec, resolution, and frame rate. |
| Video races ahead or playback is not at live pace | The file is being read faster than real time. | Put -re before the input file option -i. |
| The file plays once and stops | The loop option is absent, has the wrong value, or is positioned after the input it should affect. | Place -stream_loop -1 before -i for that file. |
| Video works but audio is missing or rejected | The file may lack an audio stream or use an unsupported audio codec or configuration. | Inspect the input streams and use an audio format permitted by YouTube’s current encoder guidance. |
| Health warnings, buffering, or dropped frames | Insufficient or variable outbound capacity, competing traffic, or VM resource pressure. | Check available upload capacity and CPU use; reduce output demands or choose a VM suited to the workload. YouTube recommends 20% bandwidth headroom. |
| Stream stops after an interruption | FFmpeg exited, the VM stopped, or the ingest connection was dropped. | Inspect process and VM logs, restart the process, and confirm the stream is live in Control Room. A loop does not itself restart a failed process. |
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