To loop a video into YouTube Live with FFmpeg, use -stream_loop -1 before the input file’s -i, then encode and send the output to YouTube using settings matched to the chosen resolution, frame rate, and codec. Looping repeats the file; encoding sets the outgoing stream format. Neither alone guarantees an uninterrupted broadcast: the source file, upload connection, computer, stream key, and YouTube’s stream health all matter.
What “the right format” means for a live stream
A prerecorded file does not have to be converted just because it is being streamed. First check whether its video, audio, resolution, frame rate, and aspect ratio suit the live output you want. If they do, FFmpeg may be able to send the source without changing its codecs; if not, re-encode or apply filters to produce a compatible output.
There are two separate jobs in a looping command:
- Input looping:
-stream_loop -1tells FFmpeg to repeat the input indefinitely. It is an input option, so put it before that input’s-i. - Output encoding and delivery: encoder, bitrate, keyframe timing, audio, and output destination determine what FFmpeg sends to YouTube Live.
FFmpeg’s documentation describes -stream_loop in its command-line documentation. The example below is an illustrative starting pattern, not a tested, universal command.
Choose YouTube settings that fit your video and connection
YouTube’s live encoder guidance lists H.264, H.265/HEVC, and AV1 for video, and AAC or MP3 for audio. Its bitrate recommendations vary by codec, resolution, and frame rate. The following values are YouTube Help’s published H.264 figures in the English-language guidance; check the current table and the row for your selected codec before streaming.
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| 720p at 30 fps | 3 Mbps | 8 Mbps |
For comparison, YouTube’s table recommends 10 Mbps for AV1 or H.265 at 1080p30 and 12 Mbps at 1080p60, with a 4 Mbps minimum for both examples. These figures are codec-specific; do not apply the H.264 rows to AV1 or H.265. Consult YouTube’s current live encoder settings, bitrates, and resolutions for the full table.
Resolution and frame rate
Choose a target that suits the source and the motion in the video. Avoid upscaling low-resolution footage simply to select a higher stream setting. If you change resolution or frame rate, make the output match your selected YouTube table row and test that the file plays correctly through the loop.
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YouTube says the total bitrate must fit the available upload bandwidth and recommends leaving 20% headroom. Include audio in your bandwidth planning and assess the connection over the length of the intended broadcast, not only from a brief speed test. A bitrate near the recommendation is not useful if the connection cannot sustain it reliably.
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Build an FFmpeg loop-to-YouTube command
This pattern repeats input.mp4, paces reading at the file’s native rate, encodes H.264 and AAC, and sends an FLV-muxed output to an RTMPS destination. Replace the placeholders and settings for your media, FFmpeg build, available upload, and the applicable YouTube bitrate table row.
ffmpeg -stream_loop -1 -re -i input.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>/<stream-key>"The sample’s 4500k is only an illustrative value; it is not a YouTube recommendation and does not match every resolution and frame-rate case. Likewise, -g 60 corresponds to a two-second interval only when the output is 30 fps. At another frame rate, adjust the GOP/keyframe timing to preserve the intended interval. The option is a conventional FFmpeg/libx264 example, not a command prescribed by YouTube.
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- Inspect the source. Confirm the file path, playback, resolution, frame rate, aspect ratio, video codec, and audio track. Decide whether the source can be sent as-is or needs re-encoding or filtering.
- Select the output settings together. Choose a YouTube-supported codec, resolution, frame rate, bitrate, keyframe interval, and audio format. Match the bitrate to the codec-specific table, then make sure the machine can encode it and the connection can upload it with headroom.
- Set the loop and pacing. Keep
-stream_loop -1before-i input.mp4. The example’s-repaces file input like a live source rather than reading it as fast as possible. - Configure the destination. Use an RTMPS YouTube ingest URL where supported by your FFmpeg build and destination. Enter the stream key in the destination string or other appropriate configuration method; treat it as a password and do not share or publish it.
- Test before relying on a long run. Start a private or otherwise appropriate test, check that both audio and representative motion are present, and review YouTube’s stream health and messages. YouTube Help says, “Make sure to test before you start your live stream.” Its encoder settings guidance advises testing audio and movement similar to the planned stream and monitoring health and messages during the event.
YouTube recommends RTMPS. FFmpeg support for particular encoders, muxers, and protocols depends on how the installed build was compiled. Verify that your build supports the options you use, and validate the output in YouTube’s control room. YouTube automatically transcodes live streams into output formats for different viewers; that does not remove the need to send a stable, correctly configured input stream.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep a long broadcast stable
A looping command can keep reading a file, but an unattended broadcast also depends on conditions outside that option. Test the actual file, computer, connection, and YouTube destination for the length and settings you intend to use. Avoid assuming that a command that starts successfully will recover from every network, encoder, or platform interruption.
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- Media: Test the transition from the file’s end back to its beginning. Inspect for black frames, silence, abrupt audio changes, damaged sections, or content that should not be rebroadcast.
- Encoder capacity: Confirm the computer can encode the chosen resolution and frame rate continuously without falling behind, overheating, or stopping. A preset such as
veryfastis a trade-off, not a guarantee of capacity or quality. - Network: Use a stable upload connection with headroom above the total outgoing bitrate. A short test cannot establish that a connection will remain stable for an extended stream.
- YouTube monitoring: Watch stream health and messages during the broadcast, and check audio and moving video rather than assuming a connected status means the stream looks right. See YouTube’s live stream settings guidance and streaming tips.
- Rights and channel policies: Having a file does not establish the right to rebroadcast it. Confirm you have the necessary rights and review YouTube’s applicable rules, including copyright and reused-content policies, before using a video continuously.
Troubleshoot common failures
| Symptom | Likely cause | What to check or change |
|---|---|---|
| The video plays once and stops | The loop option is missing or placed after the input it should affect. | Put -stream_loop -1 before -i input.mp4 and verify the exact input path. |
| YouTube does not receive the stream | Incorrect ingest URL or key, unavailable RTMPS support, or an FFmpeg build missing needed support. | Recheck the destination and key in YouTube’s control room, keep the key private, and verify the installed build’s protocol and muxer support. |
| Stream health reports problems or video stutters | Upload capacity is insufficient or unstable, or the selected bitrate does not fit the connection. | Check the total outgoing bitrate against sustained upload capacity with YouTube’s recommended 20% headroom; lower the output target if needed and test again. |
| Audio is missing, distorted, or out of sync | The source audio track, chosen audio encoding, or output settings may be unsuitable. | Inspect the source track and test the complete output with representative audio before going live; confirm AAC or MP3 settings are supported by the selected workflow. |
| Video looks soft or has the wrong dimensions | The source and output resolution, frame rate, aspect ratio, or bitrate may not align. | Inspect the source and intended output; choose the appropriate YouTube table row and add scaling or frame-rate filters only when required. |
| The stream ends despite the loop option | The process, computer, connection, or YouTube ingest may have failed; input looping alone does not recover every failure. | Check FFmpeg output, machine availability, network stability, stream key configuration, and YouTube health messages. Test any restart or recovery procedure before depending on it. |
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