To loop a local video into YouTube Live with FFmpeg, read the file in real time, encode it to a YouTube-compatible profile, and send it to the stream URL and key shown in YouTube Live Control Room. The command below is a starting template—not an outage-proof service: -stream_loop -1 repeats the input, but it does not by itself recover a failed network connection, restart a crashed process, or keep a YouTube event active.
What the setup needs to do
A continuous file-based stream has three separate jobs. Keeping them distinct makes it easier to configure and troubleshoot:
- Read and repeat the file: FFmpeg reads the local source at its native frame rate and loops it.
- Encode for YouTube: FFmpeg produces video and audio in a supported format and at a suitable bitrate, frame rate, and keyframe interval.
- Keep the transmission healthy: the computer, source file, encoder process, upload connection, stream key, and YouTube event all need to remain available.
YouTube transcodes incoming live streams for playback, so configure the encoder for YouTube’s ingestion guidance rather than encoding separate copies for every viewer playback format. The official YouTube encoder guidance supports RTMP/RTMPS, H.264, H.265/HEVC, or AV1 video, AAC or MP3 audio, and up to 60 fps. It recommends constant bitrate (CBR) and a 2-second keyframe interval, which should not exceed 4 seconds. For transport security, use RTMPS when the event provides it.
Choose the stream profile before writing the command
Video codec and bitrate
Choose a codec your installed FFmpeg build can encode and use the YouTube bitrate row for that codec, resolution, and frame rate. The figures below are YouTube’s current encoder recommendations, not a guarantee of picture quality on every source or network.
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| Codec | Profile | Minimum video bitrate | Recommended video bitrate |
|---|---|---|---|
| H.264 | 720p at 30 fps | 3 Mbps | 8 Mbps |
| H.264 | 1080p at 30 fps | 5 Mbps | 14 Mbps |
| H.264 | 1080p at 60 fps | 6 Mbps | 17 Mbps |
| H.265/HEVC or AV1 | 1080p at 30 fps | 4 Mbps | 10 Mbps |
| H.265/HEVC or AV1 | 1080p at 60 fps | 4 Mbps | 12 Mbps |
These are video bitrates; include audio when estimating the total outbound stream rate. Set a rate your connection can sustain with headroom. If 14 Mbps for H.264 1080p30 is not practical on your upload connection, choose a lower resolution or a different supported profile rather than assuming a command can make an unstable connection reliable.
Frame rate, keyframes, and image format
- Set the target frame rate explicitly so the intended keyframe interval is clear. At 30 fps, a 2-second GOP is 60 frames; at 60 fps, it is 120 frames.
- Use a 2-second keyframe interval as the target and do not exceed 4 seconds.
- For SDR, YouTube’s guidance specifies Rec. 709 and 8-bit video. Its advanced recommendations also include square pixels, progressive scan, 2 B-frames, 1 reference frame, and CABAC.
- For HDR, YouTube recommends H.265; its guidance says AV1 is not supported for HDR.
- YouTube supports up to 60 fps. Match the source and selected profile instead of asking FFmpeg to create frame rate or detail the source does not contain.
Audio
YouTube accepts AAC or MP3. For stereo audio, its advanced recommendations include 44.1 kHz and 128 kbps. For 5.1 audio over RTMP/RTMPS, AAC is supported, with 48 kHz and 384 kbps recommended. Confirm the source’s channel layout before choosing a target; the stereo settings in the example below are not a 5.1 configuration.
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Get the YouTube stream URL and key
- In YouTube Live Control Room, create or select the live stream you intend to use.
- Copy the stream URL and stream key shown for that event. Use the destination YouTube provides; do not guess or reuse a URL format from an unrelated setup.
- Keep the key private, as you would a password. Do not paste a real key into a public post, screenshot, script example, or log shared for troubleshooting.
- If the key is exposed, reset it in the live stream settings and update the encoder with the replacement key.
Start the event and encoder early enough to inspect YouTube’s preview and stream health before you begin the intended broadcast. Follow the event’s controls for whether and when to start the public stream.
Run a local-file loop with FFmpeg
FFmpeg options apply to the next input or output, so keep input options such as -re and -stream_loop before -i, and output encoding options after the input and before the destination. The following is an illustrative template for a local 1080p, 30 fps H.264 source and stereo audio. Replace the filename and destination with your own, and validate the settings against your source, FFmpeg build, event, and available upload speed.
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ffmpeg -re -stream_loop -1 -i "input.mp4"
-vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:(ow-iw)/2:(oh-ih)/2"
-r 30 -c:v libx264 -preset veryfast -pix_fmt yuv420p
-b:v 14M -maxrate 14M -bufsize 28M
-g 60 -keyint_min 60 -sc_threshold 0
-c:a aac -b:a 128k -ar 44100 -ac 2
-f flv "rtmps://YOUTUBE_STREAM_URL/STREAM_KEY"The video rate shown is YouTube’s recommended H.264 bitrate for 1080p30. It is only an appropriate choice if the source and outbound connection can sustain it. If they cannot, select a lower supported profile and its corresponding YouTube bitrate instead. The scaling filter fits the image within a 1920×1080 frame and pads unused space; check the result for letterboxing, cropping, and aspect ratio before relying on it. Remove or adjust the filter if it does not suit the source. The command assumes the local FFmpeg build includes libx264 and that the RTMPS destination syntax matches the event’s displayed URL and key.
What the input and output options do
-rereads the input at its native rate instead of sending a file as fast as possible.-stream_loop -1loops the input indefinitely. It does not restart FFmpeg or guarantee reconnection after a disconnect.-r 30sets a 30 fps output target;-g 60and-keyint_min 60set a 60-frame GOP, or 2 seconds at 30 fps. For 60 fps, the corresponding 2-second interval is 120 frames; set the output rate and GOP consistently.-b:v,-maxrate, and-bufsizeconfigure the video rate-control target, maximum rate, and buffer. The example uses CBR-style settings; test the resulting stream and confirm YouTube reports healthy ingest.-c:a aac -b:a 128k -ar 44100 -ac 2encodes stereo AAC at the recommended stereo sample rate and bitrate cited above.-f flvselects the output container used for RTMP/RTMPS transmission.
Do not publish a real stream key in a command example. If you put it directly in a shell command, it may be visible in shell history or process information depending on your environment; use your operating system’s secure secret-handling practices and avoid sharing the command unredacted.
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When stream copy might fit
If the source already has compatible video and audio streams, -c copy can avoid re-encoding and reduce CPU use. It cannot change resolution, frame rate, bitrate, codec, or keyframe cadence. Use it only after checking that the file’s stream properties meet the selected YouTube ingest profile and that the output is accepted by the event; otherwise encode the streams instead.
Check upload capacity and test the real route
- Measure outbound upload capacity, not download speed. YouTube recommends about 20% headroom above the total streaming bitrate. Include audio and any simultaneous primary or backup stream in the total.
- Allow for other devices and applications sharing the connection; the bandwidth available to the encoder can fall below the connection’s nominal capacity.
- Prefer a stable wired connection where practical, but do not treat Ethernet as a guarantee of adequate or uninterrupted upload capacity.
- Run a representative test with motion and audio similar to the actual program. Inspect the Live Control Room preview and stream-health messages, then verify playback on the intended channel or watch page.
- If using a configured backup encoder, test failover deliberately. YouTube suggests stopping the primary encoder or disconnecting its Ethernet to check the backup behavior. That test validates the configured arrangement; it does not mean one FFmpeg process automatically recovers.
YouTube’s guidance is direct: “Make sure to test before you start your live stream.” For continuous operation, monitor both YouTube’s stream health and FFmpeg’s process and logs. If you record a local archive as well, check that the file continues to grow. An unattended deployment also needs an operating-system-level supervisor or restart policy and alerting; the appropriate setup depends on the system, and the FFmpeg command alone does not provide a universal recovery guarantee.
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Choose latency with the use case in mind
Normal, low, and ultra-low latency involve different trade-offs for audience interaction and viewing delay. Choose based on how quickly viewers need to respond, then check the event’s available options. YouTube says 4K/2160p is not eligible for its low-latency optimization and is set to normal latency.
Troubleshoot the common failure points
| Symptom | Likely cause | What to check or change |
|---|---|---|
| YouTube shows no incoming video | Incorrect event, stream URL, key, or RTMPS destination | Compare the destination with the URL and key in the selected Live Control Room event. Check that the key has not been reset and that the event is ready to receive the encoder. |
| Stream health is poor or transmission drops | Insufficient or fluctuating upload capacity, including shared network use | Measure upload speed during realistic network use, account for the full stream bitrate, and preserve roughly 20% headroom. Test on the actual route. |
| FFmpeg reports an encoder or option error | The installed build may not include the chosen encoder, or an option may be in the wrong position | Check the build’s available encoders and FFmpeg’s error output. Keep input options before the input they affect and output options before the output destination. |
| Keyframes do not arrive at the intended interval | The GOP frame count and output frame rate do not match | Use 60 frames for 2 seconds at 30 fps or 120 frames at 60 fps, and set the frame rate explicitly. |
| The loop works, but the broadcast stops after a disconnect | Input looping does not restart a stopped process or repair a broken network or event | Check whether FFmpeg is still running, inspect its logs and YouTube’s health messages, and restore the failed dependency. Configure and test a separate supervisor or backup encoder if unattended recovery is required. |
| Picture is stretched, cropped, or unexpectedly bordered | Source aspect ratio differs from the chosen output frame or the scaling filter does not suit the file | Review the source dimensions and output preview. Adjust or remove the scale-and-pad filter to preserve the intended composition. |
| No audio, wrong channel layout, or poor audio level | Unexpected source audio stream, channel layout, or encoding choice | Inspect the input’s audio streams and choose stereo or 5.1 settings that match the source and YouTube’s supported profile. |
Use video you have the right to stream
Before looping a recording, confirm that you have the necessary rights to its video and audio and that its use complies with YouTube’s rules. Encoding settings do not grant permission to broadcast copyrighted material or determine whether a channel meets YouTube’s monetization policies for reused content. A loop can also make a video repetitive to viewers; consider whether the format serves the audience and clearly describes what is playing.
Or let it run in the cloud
If the goal is an always-on YouTube channel rather than learning to operate a local FFmpeg process, StreamNeo keeps uploaded videos looping from the cloud. The three steps are: upload a recording or build a playlist, add your YouTube stream key once, and go live. Nothing has to stay running on a home computer, and the service automatically recovers if YouTube drops the stream.
Every slot streams the upload as made, at any quality up to 4K 60fps, for one flat price per slot rather than a quality tier. The first day is free with no card. The Monthly price is $9.99 per month. Each slot includes one always-on stream, 10 GB storage per slot pooled across active slots, looping and playlists, automatic recovery, and StreamNeo team support. The same product is included on every plan; only the billing length changes. You can pay for a day, week, month, 6 months, or year and cancel any time. UPI and cards are available in India; card checkout is available worldwide. For 5 or more slots, contact support.
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