To stream a prerecorded 4K video to YouTube Live with FFmpeg, create a live event in YouTube Studio, copy its server URL and stream key, then send the file at real-time speed with FFmpeg’s -re input option. For H.264, YouTube recommends 42 Mbps at 4K/30 fps or 50 Mbps at 4K/60 fps, with a two-second keyframe interval. Treat the command below as a template: check your file, FFmpeg build, upload capacity, and YouTube’s stream health before relying on it.
Before you start
- A prerecorded video file with known resolution, frame rate, audio tracks, and color format.
- An FFmpeg build that includes the video encoder and audio encoder you plan to use. Availability depends on how FFmpeg was built.
- A YouTube channel and access to YouTube Studio’s Live Control Room to create an event and retrieve its stream URL and key.
- An internet connection with stable upload capacity comfortably above the selected video bitrate. Measure it rather than assuming your advertised connection speed is sustained upload speed.
This is a live ingest workflow, not a video upload. The bitrate recommendations below are for sending a live stream to YouTube; they are not export settings for uploading a video file.
Choose the 4K settings
YouTube’s live-encoder guidance lists the following 4K/2160p ingest bitrates. Choose based on both codec and frame rate; these figures are recommendations and minimums, not a promise that a particular connection or encoder will deliver a stable stream. YouTube’s live encoder settings are the reference for these values.
| Codec | Frame rate | Minimum bitrate | Recommended bitrate |
|---|---|---|---|
| H.264 | 30 fps | 11 Mbps | 42 Mbps |
| H.264 | 60 fps | 14 Mbps | 50 Mbps |
| AV1 or H.265/HEVC | 30 fps | 8 Mbps | 30 Mbps |
| AV1 or H.265/HEVC | 60 fps | 10 Mbps | 35 Mbps |
Match the output to the source
Use the file’s actual frame rate where practical instead of converting 30 fps footage to 60 fps without a reason. If you choose 30 fps, YouTube’s recommended two-second keyframe interval corresponds to a 60-frame GOP; for 60 fps it corresponds to 120 frames. YouTube recommends a two-second interval and says not to exceed four seconds.
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Account for audio and color
YouTube lists AAC or MP3 for audio; its stereo guidance specifies 128 kbps at 44.1 kHz. For 5.1 surround it lists 384 kbps at 48 kHz, with 5.1 over RTMP/RTMPS supported only for AAC. The example command uses AAC stereo settings.
For SDR, YouTube’s advanced recommendations specify Rec. 709 and 8-bit color. For HDR, YouTube recommends H.265/HEVC and 10-bit; it says AV1 is not supported for HDR. An encoder and transport path must support the intended HDR workflow. The example below uses H.264 with yuv420p, a compatibility-oriented SDR template; it does not preserve HDR as HDR.
Plan for normal latency
YouTube’s low-latency optimization is unavailable for 4K/2160p, which is set to normal latency. If minimal delay is essential, reconsider whether 4K is necessary for this broadcast.
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Create the YouTube live event and protect the stream key
- Open YouTube Studio and go to Live Control Room. Create or select the live stream/event you intend to use.
- Copy the stream URL and stream key shown for that stream. YouTube’s setup guidance describes entering the URL and key in the encoder. See YouTube’s live stream settings.
- Use the exact destination and protocol shown in Live Control Room. YouTube recommends RTMPS for encrypted transport. Do not assume the illustrative RTMP URL in the command is the URL for your event.
- Keep the stream key secret, like a password. Do not put it in a public script, screenshot, shared terminal log, or source repository. If it is exposed, replace or reset it in YouTube Studio before broadcasting.
- Check the event’s resolution behavior. YouTube normally detects resolution and frame rate; a custom stream key can enable manual selection. If the detected output is wrong, compare the actual encoded output and the selected stream settings before changing multiple variables.
Check FFmpeg and the input file
Inspect the file before choosing a command. Confirm it contains the expected video stream, frame rate, dimensions, audio, and SDR/HDR format. Also confirm your FFmpeg build has the encoder named in the command. The exact capabilities vary by build; a command using libx264 will fail if that encoder is unavailable.
FFmpeg usually processes a file as quickly as it can. For a prerecorded file being sent as a live source, -re before the input paces reading at the file’s native rate. FFmpeg’s official muxer documentation uses this pattern in its RTMP example, alongside H.264, AAC, and FLV output: FFmpeg formats documentation.
Send a 4K/30 fps H.264 stream
This template assumes an SDR-compatible H.264/AAC workflow, a 30 fps output, a first audio stream if present, and a destination URL assembled from the server address and your private key. Replace the placeholders and verify the options against your installed FFmpeg build before using it.
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ffmpeg -re -i "input.mp4"
-map 0:v:0 -map 0:a:0?
-c:v libx264 -preset veryfast -pix_fmt yuv420p
-r 30 -g 60 -keyint_min 60 -sc_threshold 0
-b:v 42M -maxrate 42M -bufsize 84M
-c:a aac -b:a 128k -ar 44100
-f flv "rtmp://a.rtmp.youtube.com/live2/YOUR_STREAM_KEY"The command is an editorial template based on YouTube’s published ingest guidance and FFmpeg’s documented RTMP example, not a tested recipe. Substitute the actual server URL and key from Live Control Room. For a 60 fps output, set -r 60, -g 120, and -keyint_min 120, and use the H.264 recommendation of 50 Mbps if your measured connection and encoder can sustain it.
What the important options do
-rereads the input at its native rate so the file is paced like a live source.-map 0:v:0selects the first video stream.-map 0:a:0?selects the first audio stream if present; the question mark makes that mapping optional. If you need a different audio track, more than one track, or no audio, adjust mapping intentionally.-c:v libx264selects the H.264 encoder.-preset veryfastfavors encoding speed over compression efficiency; whether a machine can encode 4K in real time depends on its hardware and workload.-rsets output frame rate. Avoid unnecessary conversion, especially if it would increase encoding load.-g 60and-keyint_min 60set a 60-frame GOP for 30 fps output, or two seconds.-sc_threshold 0disables scene-cut keyframes so keyframe spacing remains predictable.-b:vand-maxrateset the video bitrate and maximum rate in this example.-bufsizeis an encoder rate-control setting; it does not guarantee network buffering or stream reliability.-f flvselects the FLV container commonly used for RTMP output. If YouTube gives you a different supported protocol or endpoint, follow the event’s settings and verify your FFmpeg transport support.
When H.265 or AV1 is appropriate
YouTube lists H.264, H.265/HEVC, and AV1 as live video ingest codecs, up to 60 fps. H.265 or AV1 may suit a workflow that supports them and their corresponding bitrate recommendations, but do not assume your FFmpeg build, encoder hardware, or RTMP(S)/HLS path supports the codec you want. For HDR, verify the complete 10-bit encoding and delivery path rather than sending HDR footage through the SDR-oriented example above.
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- Run an upload speed test under conditions similar to the planned broadcast. Choose a bitrate the connection can sustain with room for variation; a result that only barely matches the video bitrate leaves no sensible headroom for fluctuations and audio or other traffic.
- Start a private or unlisted test event where appropriate. Include representative motion and audio, rather than checking only a static image.
- Start FFmpeg and monitor its output for encoder errors, dropped frames, or network issues. In Live Control Room, review stream health and messages.
- Confirm YouTube detects the intended 4K resolution and frame rate, then inspect the picture, motion, and audio. Playback availability at 4K may vary while YouTube processes the stream.
- Only proceed with the intended event after the test is satisfactory. YouTube’s encoder guidance explicitly says, “Make sure that you test before you start your live stream.” See YouTube’s live encoder settings.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| FFmpeg says the encoder or codec is unavailable | The installed build lacks the requested encoder or audio support. | Verify the build’s available encoders and choose an encoder it includes; do not assume every FFmpeg package includes libx264. |
| Stream starts too quickly or ends prematurely | The prerecorded file is being read faster than real time, or the command is not pacing input. | Put -re before -i for this file-based live workflow. |
| YouTube reports unstable stream health or the stream stalls | Upload variation, a bitrate too high for the connection, or heavy encoder load can interrupt output. | Check sustained upload capacity and encoder resource load first. Reduce the bitrate or output complexity if needed, then test again. |
| YouTube detects the wrong resolution or frame rate | The encoded output may differ from the file or expected event configuration. | Inspect actual output properties and the Live Control Room stream settings, including any custom-key/manual-resolution option. Change one factor at a time. |
| No sound, or the wrong audio | The file has no audio, multiple tracks, or the first audio stream is not the intended one. | Inspect its audio streams and revise -map 0:a:0? deliberately. Confirm AAC output and check audio in a test event. |
| HDR looks wrong or is not delivered as HDR | The example’s H.264 and 8-bit yuv420p settings are an SDR-oriented path. |
Do not describe this output as HDR. Check YouTube’s HDR guidance and verify compatible 10-bit H.265 encoding and transport support. |
| The stream key is rejected or the stream reaches the wrong event | The URL/key pair may be stale, mismatched, mistyped, or exposed and reset. | Copy the current destination and key for the intended event from Live Control Room, keeping the key private. |
Optional FFmpeg recovery for temporary network failures
FFmpeg documents a FIFO muxer pattern with recovery attempts for temporary failures:
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ffmpeg -re -i INPUT -c:v libx264 -c:a aac -f fifo -fifo_format flv
-drop_pkts_on_overflow 1 -attempt_recovery 1 -recovery_wait_time 1
-map 0:v -map 0:a rtmp://example.com/live/stream_nameThis is a generic FFmpeg documentation example, not a YouTube guarantee. Use it only after confirming the installed build supports the FIFO muxer and testing its failure behavior safely. Recovery options do not replace a sufficiently stable connection or YouTube-side diagnostics.
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