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What you need before starting
- A Linux VPS with enough sustained outbound bandwidth for both streams and enough CPU capacity if either process will encode video.
- Two local media files, or another accessible input for each stream. The commands below show local files.
- A separate YouTube Live stream and stream key for each output. Retrieve each endpoint and key from YouTube Studio’s Live Control Room.
- FFmpeg installed on the VPS. Check the build with
ffmpeg -version; available codecs vary by build. - A way to keep each process supervised, log output separately, and alert you if a process or stream becomes unhealthy.
Use the exact RTMPS ingest URL YouTube provides for each stream. YouTube recommends RTMPS, which encrypts the connection using TLS/SSL. Do not assume an RTMP endpoint can simply be changed to RTMPS by editing its prefix. See YouTube’s encoder settings guidance and RTMPS instructions.
Prepare the two YouTube streams
- In YouTube Studio, open Live Control Room and create or select the first live stream. Copy its stream URL and stream key.
- Create or select the second live stream and copy its own URL and key. Keep the destinations distinct: each FFmpeg process must send to the stream you intend.
- Protect both keys like passwords. Do not put an unredacted key in a public script repository, screenshot, or log shared for troubleshooting. If a key is exposed, reset it in Live Control Room and update the matching FFmpeg configuration.
- Configure the streams and visibility in YouTube Studio, then verify each incoming feed in Live Control Room before relying on unattended operation.
YouTube explains that the stream key identifies where the encoder sends its feed and allows YouTube to accept it in Manage live stream settings.
Choose whether to copy or re-encode the media
Re-encode when output control or compatibility requires it
Re-encoding lets you set codec, bitrate, frame rate, resolution, and keyframe cadence, but both VPS processes then perform encoding work. The example below uses H.264 and AAC settings as an illustration, not as a universal preset. Its 5 Mbps video rate aligns with YouTube’s recommended H.264 rate for 720p30, but only use that target when it suits the chosen output.
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Copy only after checking the source
Stream copy avoids video and audio encoding, which can reduce CPU demand, but the source codecs, frame rate, resolution, and container constraints still need to be compatible with YouTube ingest. Inspect a file with ffprobe /path/to/file.mp4 and confirm what streams it contains before choosing copy mode. Copying does not make an incompatible input compatible.
YouTube’s current guidance supports H.264, H.265/HEVC, and AV1 video for RTMP/RTMPS, recommends CBR, supports frame rates up to 60 fps, and recommends a two-second keyframe interval that should not exceed four seconds. The exact bitrate depends on codec, resolution, and frame rate; consult YouTube’s current encoder settings table.
Run each loop as its own FFmpeg process
FFmpeg’s -stream_loop -1 repeats an input indefinitely. Put -re before each file input so FFmpeg reads it at its native rate for live-style output. FFmpeg options generally apply to the next input or output, so keep input options before -i and output options before the destination.
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Start stream one
ffmpeg -re -stream_loop -1 -i /path/to/stream-one.mp4
-c:v libx264 -preset veryfast -b:v 5M -maxrate 5M -bufsize 10M
-g 60 -keyint_min 60 -sc_threshold 0
-c:a aac -b:a 128k -ar 44100
-f flv 'rtmps://INGEST_URL/STREAM_KEY'Replace the file path and quoted destination with the actual file and exact RTMPS URL plus key from Live Control Room. A key embedded in a command may be visible to users with access to process details, so restrict server access and prefer protected configuration or secret handling appropriate to your setup.
Start stream two independently
Run a second command or service with the second file, second stream’s endpoint and key, and its own log and restart policy. Keep the settings appropriate to that file; the example’s bitrate and output values are not automatically right for a different resolution, frame rate, or codec. Separate processes make it easier to isolate one stream’s failure without stopping the other.
Use copy mode only if the source is suitable
For a compatible source, the output codec options can be replaced with -c:v copy -c:a copy. Confirm that the input’s audio and video codecs and stream layout are accepted by the intended YouTube ingest configuration; if not, encode the incompatible track rather than assuming a copy will work.
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Set bitrate and keyframes for YouTube
YouTube recommends constant bitrate (CBR) and a two-second keyframe frequency, with intervals no longer than four seconds. For the H.264 examples below, YouTube’s current encoder guidance, accessed 2026-10-03, gives these video bitrate figures:
| Output | H.264 minimum | H.264 recommended |
|---|---|---|
| 720p30 | 3 Mbps | 8 Mbps |
| 1080p30 | 5 Mbps | 14 Mbps |
| 1080p60 | 6 Mbps | 17 Mbps |
| Stereo audio | not stated in the cited recommendation | 128 Kbps |
These recommendations are specific to codec, resolution, and frame rate; do not treat the H.264 values as the correct targets for HEVC or AV1. In the example command, -g 60 represents a two-second GOP only when output is 30 fps. At 60 fps, a two-second GOP would be 120 frames. If you do not explicitly set the output frame rate, check the resulting frame rate and keyframe timing rather than assuming the value of -g means two seconds.
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The example’s -maxrate and -bufsize illustrate a constrained-bitrate configuration, but they do not by themselves guarantee CBR in every encoder setup. Validate the actual output and compare it with YouTube’s requirements. Do not add audio and video recommendations into an exact network-capacity figure: transport overhead and bitrate variation also matter.
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Plan VPS bandwidth and compute for both outputs
Add the configured outgoing rates of both independent streams to estimate the sustained upload requirement. YouTube says total streaming bitrate cannot exceed available upload bandwidth and recommends 20% upload headroom. Applying that reserve to the combined rate of two independent outputs is a practical planning inference, not a YouTube-published two-stream rule. See YouTube’s streaming tips.
- Check sustained outbound capacity from your VPS region, not just a headline port speed, and leave room above the combined target for overhead and variation.
- Test both streams concurrently. A server that handles each stream separately may not handle both at once.
- Monitor CPU, memory, network throughput, FFmpeg output, dropped frames, and each stream’s YouTube health status.
- Account for scaling, filters, other VPS services, and any workloads beyond the two encoders.
No universal CPU-core or memory figure can be given without the media properties, encode settings, provider, region, and measured VPS performance. Two software encodes can require substantially more CPU than two compatible stream-copy outputs. Choose capacity from a simultaneous test rather than a generic VPS label.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Keep both streams running and recover deliberately
Run the processes under a supervisor such as systemd or another process manager, with one unit or managed job per stream. Configure restart-on-failure, separate logs, and monitoring for both the process and YouTube’s stream health. FFmpeg has reconnect options for certain protocols, but those options do not establish that every RTMP/RTMPS or YouTube-side failure will recover. Consult the FFmpeg protocol documentation, confirm which options apply to your input or output protocol, and test failure and recovery behavior before depending on it.
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- Do not share the stream key or log output containing it when asking for help.
- Test the actual loop duration, audio, moving video, restart behavior, and both streams together before leaving them unattended.
- Keep per-stream configurations and restart controls independent so a failure in one does not unnecessarily take down the other.
YouTube recommends testing with audio and moving video similar to the actual content, then monitoring stream health and messages in Live Control Room; see YouTube’s streaming tips.
Understand YouTube’s archive and DVR behavior
YouTube says streams under 12 hours are automatically archived. Separately, DVR rewind may be limited or unavailable for streams longer than 12 hours. DVR affects pausing and seeking backward while a stream is live; archive availability is a separate behavior. Check current Live Control Room settings and YouTube’s DVR guidance when choosing whether to run a continuous session or shorter sessions.
Troubleshoot common failures
| Symptom | Likely cause | What to check |
|---|---|---|
| YouTube does not receive a stream | Wrong endpoint or key, stream not configured, or connection issue | Copy the exact RTMPS URL and matching key from Live Control Room; check FFmpeg logs and Live Control Room messages. |
| One stream works, the other drops or buffers | Combined network demand or CPU load exceeds what the VPS sustains | Measure both processes together; check outbound throughput, CPU, dropped frames, and each stream’s health. |
| FFmpeg reports an unsupported codec or YouTube rejects output | Source format or chosen output settings are incompatible | Inspect the file with ffprobe; use compatible codecs or re-encode to settings supported by YouTube. |
| The loop plays too quickly or output timing is wrong | File input is not being paced in real time, or frame-rate/keyframe assumptions are incorrect | Use -re before the file input and verify output frame rate and GOP timing. |
| Process exits and stays stopped | No supervisor restart policy, or the failure is not handled by the configured reconnect options | Inspect the process exit and logs, configure a per-stream supervisor, and test restart behavior. |
| Stream stops after exposing or changing a key | Key was reset, compromised, or no longer matches the stream configuration | Retrieve the current key, update only the corresponding process, and secure configuration and logs. |
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Frequently Asked Questions
Can the two FFmpeg loops use the same YouTube stream key?
No. Configure each process with the destination and stream key for its own intended YouTube Live stream.
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Does a stream running longer than 12 hours get archived?
YouTube’s stated automatic archive behavior applies to streams under 12 hours; check current YouTube guidance for longer sessions.
Quick Recap
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