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What you need before you start
- A Windows PC that can run the chosen FFmpeg command continuously, plus stable upload connectivity suited to your output bitrate. There is no universal CPU, RAM, or connection-speed minimum: requirements depend on the source and whether you re-encode.
- An installed FFmpeg build that includes the encoders and muxers you plan to use.
- A video and audio recording you have the rights to stream, and access to YouTube live streaming.
- A stream URL and stream key from YouTube Studio’s Live Control Room. YouTube’s setup guidance is at Manage live stream settings and Create a YouTube live stream with an encoder.
Use the stream key as a password: do not publish it, include it in screenshots or public logs, or commit it to a shared script repository.
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Set up the YouTube stream
- In YouTube Studio, open Live Control Room and create or select the stream you intend to use.
- Copy the stream URL and stream key shown in the stream’s settings. Use the exact ingest URL YouTube provides; do not substitute a guessed host or path.
- Prefer the RTMPS URL when available. YouTube describes RTMPS as RTMP over TLS/SSL and recommends it for encrypted delivery. If your FFmpeg build cannot connect, check that it supports the protocol and verify the URL before considering a compatible RTMP option.
- Choose the output resolution, frame rate, bitrate, and keyframe interval based on the source, your actual upload capacity, and YouTube’s current encoder guidance: Choose live encoder settings, bitrates, and resolutions.
Build the looping FFmpeg command
Open Command Prompt or PowerShell, change to the folder containing FFmpeg if needed, and adapt this starting pattern. Replace the quoted file path and placeholder destination with your own values; the angle-bracket placeholder is not a working URL.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchffmpeg -re -stream_loop -1 -i "C:pathtovideo.mp4" -c:v libx264 -preset veryfast -b:v 4500k -maxrate 4500k -bufsize 9000k -g 60 -c:a aac -b:a 128k -f flv "rtmps://<YouTube-ingest-host>/<path>/<STREAM_KEY>"The values shown are an example pattern, not universal YouTube settings. In particular, set bitrate, frame rate, and keyframe interval to match the chosen resolution and YouTube’s current guidance. A 60-frame keyframe interval is appropriate only when it matches the output frame rate and the recommended interval for that configuration.
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Why the input options go before -i
-stream_loop -1 tells FFmpeg to repeat the input indefinitely; -re reads the file at its native frame-rate pace so it is sent in real time rather than as fast as the computer can process it. FFmpeg documents these options in its option reference. They apply to the input, so put them before the corresponding -i.
Re-encode or copy the streams
The example uses -c:v libx264 and -c:a aac, so FFmpeg encodes video and audio to those output codecs. Re-encoding gives you control over output format and bitrate but uses processing resources. If your source streams already meet YouTube’s requirements, stream copying may reduce processing load; compatibility, timestamps, and audio behavior at the loop boundary still need testing.
To try stream copying, replace the codec options with -c copy and remove encoding-only options such as -preset, -b:v, -maxrate, -bufsize, -g, and -b:a. Do not assume this will work for every file: inspect the source streams and verify the result in a test broadcast before relying on it.
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Keep the stream key out of a saved public script
A batch file makes the command easier to restart, but a key written directly into the file is exposed to anyone who can read it. One alternative is to keep it in an environment variable and reference that variable in the command, while restricting access to the account and machine. Environment variables are not a complete security boundary; do not print the expanded command to public logs or share the configured file.
Test before making the broadcast public
- Start FFmpeg with the planned file, output settings, and YouTube destination.
- Wait for the incoming preview and stream-health indication in Live Control Room. Confirm the picture and sound are correct before making a scheduled stream public or using the Go live control required by that stream’s configuration.
- Watch through at least one loop boundary. Check for missing frames, a pause, duplicated or clipped audio, unexpected silence, or a visible jump.
- Check the broadcast on the devices and network conditions relevant to your audience. Confirm that FFmpeg remains active and the upload continues rather than assuming a successful initial connection will last.
YouTube recommends test streams and ongoing quality monitoring. Its Streaming tips and YouTube live streaming tips – Computer cover operational checks.
Plan for a long-running stream and its replay
A repeating input does not restart FFmpeg after a crash, restore a failed internet connection, or ensure YouTube accepts a reconnect. For a broadcast that is meant to run unattended, decide who or what will notice a failure and how the process will be restarted. YouTube recommends monitoring stream quality; arrange human checks or alerting appropriate to the consequences of an interruption.
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Transient connection failures
FFmpeg documents a FIFO-muxer recovery pattern using -f fifo -fifo_format flv -attempt_recovery 1 -recovery_wait_time 1 in its muxer documentation. Treat that as a pattern to adapt and validate with your FFmpeg build, not a guarantee: a recovered output does not ensure YouTube accepts the session again, and FIFO recovery will not restart FFmpeg after a process crash.
A Windows process supervisor or scheduled task can be configured to restart a failed process, but test how it interacts with your YouTube stream settings. Avoid running two encoders against the same stream key at once; overlapping senders can complicate recovery rather than improve it.
Continuous broadcast, archive, and rewind are separate goals
YouTube says streams under 12 hours are automatically archived. That guidance does not promise that a single stream running for 24 hours or longer will produce one complete archive. YouTube also says DVR rewind may be limited or unavailable for streams longer than 12 hours; see Turn on DVR on live streams. Plan session handling and archive retention separately if replay completeness or viewer rewind matters. Splitting a broadcast into sessions changes continuity and restart behavior, and should be checked against the current Live Control Room controls rather than treated as a universal fix.
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Rights and YouTube policy checks
Before broadcasting, confirm you have permission for the video, music, and any other content in the file. Looping the same recording does not change the rights status of its contents. Follow YouTube’s Community Guidelines and live-streaming policies; its streaming tips include policy and operational guidance.
Troubleshoot common problems
| Symptom | Likely cause | What to check |
|---|---|---|
| FFmpeg rejects an option or cannot open the file | Option order, path, quoting, or FFmpeg build issue. | Confirm the file exists, keep input options before -i, quote Windows paths, and check that the installed build supports the selected codecs and protocol. |
| YouTube receives no video or rejects the connection | Incorrect stream URL/key, unsupported transport, or a configuration mismatch. | Copy the exact URL and key from Live Control Room, prefer RTMPS if supported, and review the encoder settings and incoming preview. |
| Video buffers, drops frames, or stream health degrades | Upload capacity is insufficient or inconsistent for the selected bitrate, or encoding load is too high. | Compare actual upload stability with the configured output bitrate; choose settings appropriate to the connection and source, then test again. |
| Picture or sound breaks at the loop point | The file’s ending and beginning do not join cleanly, or stream-copy timestamps/codecs are unsuitable. | Inspect the source boundary, test a full loop privately or unlisted, and try re-encoding if copying produces incompatible output. |
| Broadcast stops after an interruption | The connection or FFmpeg process failed, or YouTube did not accept a reconnect. | Check FFmpeg’s output and Live Control Room health, test recovery handling, and establish a restart and alerting plan. |
| Replay is incomplete or rewind is missing | Long-stream archive and DVR behavior differ from continuous live delivery. | Account for YouTube’s documented 12-hour archive and DVR guidance; plan session handling and replay retention separately. |
Or let it run in the cloud
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