To loop a local video into YouTube Live, run FFmpeg with real-time input reading and infinite input looping, encode to a YouTube-compatible profile, and publish to the stream URL and key from YouTube Live Control Room. The loop repeats the file; it does not keep the network, FFmpeg process, or YouTube event alive if one of those fails. For a continuous broadcast, test the full route and monitor it.
What the FFmpeg workflow does—and what it does not
There are three separate jobs: FFmpeg reads the local file at its normal playback rate, loops it, then encodes and sends it to YouTube. YouTube receives that feed and transcodes it for viewers; your encoder needs to meet YouTube’s ingestion requirements, not create every viewer playback format.
-stream_loop -1 tells FFmpeg to repeat an input indefinitely, while -re reads it at native frame rate rather than sending the file as fast as the computer can process it. Neither option guarantees an uninterrupted broadcast. The source file, FFmpeg process, network connection, stream key, and YouTube event must all remain usable.
Choose a YouTube ingest profile
Use YouTube’s current encoder settings for the selected codec, resolution, and frame rate rather than copying a bitrate from an unrelated setup. YouTube lists RTMP/RTMPS, H.264, H.265/HEVC, or AV1 video, AAC or MP3 audio, up to 60 fps, and constant bitrate (CBR). It recommends a 2-second keyframe interval and says not to exceed 4 seconds. Use RTMPS when available; YouTube says it encrypts data in transit to and through Google’s servers.
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| Profile example | Codec | YouTube minimum bitrate | YouTube recommended bitrate |
|---|---|---|---|
| 720p at 30 fps | H.264 | 3 Mbps | 8 Mbps |
| 1080p at 30 fps | H.264 | 5 Mbps | 14 Mbps |
| 1080p at 60 fps | H.264 | 6 Mbps | 17 Mbps |
| 1080p at 30 fps | H.265/HEVC or AV1 | 4 Mbps | 10 Mbps |
| 1080p at 60 fps | H.265/HEVC or AV1 | 4 Mbps | 12 Mbps |
These are YouTube’s published encoder recommendations, not a guarantee of image quality on every source or network route. Select a bitrate your measured upload connection can sustain. The H.264 1080p30 command below uses YouTube’s 14 Mbps recommended video bitrate; audio bitrate is additional to that figure.
Frame rate, keyframes, and picture format
A 2-second keyframe interval means 60 frames at 30 fps or 120 frames at 60 fps. The GOP settings in the example match the 30 fps case; changing the frame rate without changing the GOP changes the interval. For SDR, YouTube’s advanced recommendations include Rec. 709 and 8-bit video. Its other advanced recommendations include square pixels, progressive scan, 2 B-frames, 1 reference frame, and CABAC.
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For HDR, YouTube recommends H.265; its guidance says AV1 is not supported for HDR. YouTube’s encoder settings list up to 60 fps. Also consider latency needs: YouTube says 4K/2160p is not eligible for its low-latency optimization and is set to normal latency.
Audio
YouTube accepts AAC or MP3. For stereo, 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. The example command produces stereo AAC at 44.1 kHz and 128 kbps; confirm that this suits the source and event.
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Get the stream destination and protect the key
- In YouTube Studio, open Live Control Room and create or select the live stream.
- Copy the stream URL and stream key shown for that event. Use the exact destination YouTube provides; do not assume every account or event uses an identical URL format.
- Treat the key like a password. Keep it out of public commands, screenshots, logs, and support posts. If it is exposed, reset it in the stream settings and update the encoder.
The command below uses a clearly marked placeholder in place of the real destination and key. Replace it locally with the values from Live Control Room.
Loop and encode a local file with FFmpeg
This is a template for a local file and a 1080p, 30 fps H.264 target. Validate it against your file, installed FFmpeg build, selected YouTube profile, and event destination before relying on it unattended.
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ffmpeg -re -stream_loop -1 -i "input.mp4"
-r 30 -c:v libx264 -preset veryfast -b:v 14M -maxrate 14M -bufsize 28M
-g 60 -keyint_min 60 -sc_threshold 0
-c:a aac -b:a 128k -ar 44100
-f flv "rtmps://YOUTUBE_STREAM_URL/STREAM_KEY"Replace input.mp4 with the local file path and replace the destination placeholder with the exact RTMPS URL and key from your event. Never publish a command containing a live key. In this example, -re and -stream_loop -1 are input-side options placed before -i; codec, rate-control, audio, output format, and destination options follow the input. FFmpeg command-line options generally apply to the next input or output, so ordering matters.
-r 30sets the output frame rate to 30 fps for this target. Check the source and choose an appropriate profile rather than assuming this value suits every video.-b:v 14Mand-maxrate 14Mset the example video rate to 14 Mbps.-bufsize 28Mis twice that rate as an encoder buffer setting; these values do not make an unstable upload connection reliable.-g 60 -keyint_min 60 -sc_threshold 0set a 60-frame GOP for a two-second interval at 30 fps and prevent scene changes from altering the intended cadence. At 60 fps, use a matching 120-frame interval instead.-preset veryfasttrades encoding efficiency for lower CPU demand compared with slower x264 presets. If the machine cannot encode in real time, reduce the workload or use an encoder and profile that your hardware supports.-f flvselects the output container commonly used for RTMP/RTMPS publishing.
The example is not a universal command or a tested guarantee. Check FFmpeg’s output and YouTube’s preview and stream-health messages before starting a public event. If you choose a lower resolution or another codec, select its matching bitrate from YouTube’s current guidance and revise the command accordingly.
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When stream copy may work
If the source already has compatible codecs and encoding parameters, FFmpeg stream copy (-c copy) may avoid re-encoding and reduce CPU use. It cannot change resolution, frame rate, bitrate, keyframe cadence, or unsupported codec details. YouTube’s ingest requirements still apply, so do not use stream copy without checking the actual source and confirming the stream health.
Prepare the connection and keep watch
- Measure outbound upload capacity, not download speed. YouTube recommends approximately 20% headroom beyond the total streaming bitrate, and shared Wi-Fi or office traffic can reduce capacity available to the encoder. Account for both feeds if you send primary and backup streams.
- Prefer a stable connection and test the actual route from the machine that will run FFmpeg. A wired Ethernet connection can avoid some Wi-Fi variability, but does not guarantee enough bandwidth or an uninterrupted stream.
- Set up the event in advance, start the encoder early, and check the Live Control Room preview before making the broadcast public. Test with representative motion and audio.
- Monitor both FFmpeg’s process and log output and YouTube’s stream-health messages. Confirm that the video appears on the channel or watch page. If recording a local archive, check that the file continues to grow.
- If the production has a configured backup encoder, test its failover deliberately—for example, by stopping the primary encoder or disconnecting its Ethernet connection. That test checks the configured backup behavior; it does not establish that one FFmpeg process reconnects or recovers automatically.
- For unattended operation, arrange a process supervisor or restart policy and alerting appropriate to your operating system and deployment. The command alone supplies no universal restart or zero-interruption guarantee.
Troubleshoot common failures
| Symptom | Likely cause | What to check or do |
|---|---|---|
| No preview or YouTube reports no incoming feed | Wrong event destination, invalid key, or FFmpeg cannot publish | Confirm that the event is live-ready and that the URL and key match Live Control Room. Check FFmpeg’s error output. If the key was exposed, reset it and replace it in the local command. |
| FFmpeg exits or reports an input error | Incorrect file path, unreadable source, or an input issue | Check the filename, path, file permissions, and whether the file plays locally. Confirm that the loop option precedes the input it is intended to affect. |
| Buffering, dropped frames, or poor stream health | Insufficient or inconsistent upload capacity, or encoding load | Measure available upload during the actual broadcast conditions, preserve YouTube’s recommended headroom, and check CPU load. Lower the target profile or bitrate if the connection cannot sustain it, then test again. |
| Unexpected keyframe interval | GOP length does not match output frame rate | Calculate frames per interval: 60 frames for two seconds at 30 fps, 120 at 60 fps. Set the output frame rate explicitly and match the GOP settings. |
| Image or audio does not match the source | Output settings, codec compatibility, or source characteristics differ from the intended profile | Review FFmpeg’s stream information and output logs, verify the selected YouTube profile, and test representative picture and sound in the preview before going public. |
| Stream stops after a disconnect or process failure | The loop repeats media but does not supervise the process or repair the network | Restore connectivity, restart or supervise FFmpeg as appropriate, and test any configured backup path. Monitor YouTube health after restart; do not assume a single command provides automatic recovery. |
Check rights and YouTube suitability
Encoding a file for live delivery does not grant permission to broadcast it. Use material you own or are authorized to stream, including music and other embedded assets, and review YouTube’s applicable copyright and live-streaming rules before scheduling a recurring broadcast. Repeating a file technically is not evidence that a channel meets YouTube’s separate monetization or reused-content requirements; assess those policies independently rather than treating a successful ingest as approval.
Or let it run in the cloud
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