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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →You can send a looped video from a Synology NAS to YouTube Live with Docker only if your exact NAS, DSM release, container and encoder can sustain the encode and network workload. YouTube accepts 4K/2160p at 60fps, but its recommended bitrate depends on the codec. The official sources cited here do not establish a Synology model-specific Docker recipe or prove that any unspecified NAS can encode this workload continuously. Treat the steps below as a compatibility-checked setup process, not a guarantee that every Synology can do it.
What the setup requires
A Docker-based loop has three parts: a video file the container can read, an encoder that can produce the chosen 4K60 video and compatible audio, and YouTube’s ingest address and stream key. Docker and NAS storage alone do not ensure that the NAS can encode the file at 3840×2160 and 60fps in real time.
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- Media: the container must be able to access the source file and read its video and audio streams.
- Encoding: the encoder must support the desired output codec, resolution, frame rate, audio format, keyframe cadence and bitrate. Check whether it can use a hardware encoder on your exact NAS; do not assume that hardware access is available to a container.
- Network: the NAS needs stable upload capacity above the selected video bitrate, with room for audio and normal variation. A speed-test result is not a guarantee of sustained throughput.
- YouTube ingest: use the live setup’s current stream URL and stream key. YouTube’s API describes these as ingestion information; some encoders need the URL and key separately, while others accept them together.
Verify your NAS model, DSM and container-management release, encoder implementation and any hardware-encoding support before building around a 4K60 target. The official Synology documentation cited here describes a different feature—Surveillance Station’s camera-source Live Broadcast—and says that feature supports H.264. It is not a documented Docker file-loop recipe and does not establish 4K60 support for a NAS. See Synology’s Live Broadcast documentation.
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YouTube’s current encoder guidance, accessed in 2026, gives these settings for 4K/2160p at 60fps. The bitrate is a YouTube ingest recommendation, not a measured capability claim about Synology hardware.
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| Video codec | Resolution and frame rate | Minimum video bitrate | Recommended video bitrate |
|---|---|---|---|
| H.264 | 4K/2160p at 60fps | 14 Mbps | 50 Mbps |
| AV1 or H.265 | 4K/2160p at 60fps | 10 Mbps | 35 Mbps |
Use the row matching the codec your encoder actually sends; do not apply the H.264 bitrate figures to AV1 or H.265, or vice versa. YouTube’s settings page recommends constant bitrate (CBR), a two-second keyframe interval and says not to exceed four seconds. Its encoder guidance specifies AAC or MP3 audio. Consult YouTube’s encoder settings and bitrate guidance for the full current recommendations.
YouTube’s Live Streaming API recognizes 2160p and 60fps as inbound stream properties and supports RTMP, including RTMPS. Prefer RTMPS when the encoder supports it; YouTube says it encrypts data into and through Google’s servers. The API also describes stream-health issue indicators. See YouTube LiveStreams API documentation.
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Prepare the NAS and container
- Confirm compatibility for your exact NAS. Check the model specifications and DSM/container-management release, then confirm that your chosen container can run on that platform. Find out whether the encoder can access hardware encoding, and whether it can sustain the target output. The sources here do not provide a model-by-model compatibility list or benchmark.
- Check the source media. Confirm the file is readable by the selected encoder, that the container can access its mounted location, and that the audio stream is present and usable. Do not assume that a video file’s resolution or frame rate tells you what the container will output; configure and verify the outgoing stream.
- Check real upload capacity. Compare sustained available upload bandwidth with the video bitrate selected for the codec, leaving headroom for audio and fluctuations. If the connection cannot sustain the recommended bitrate reliably, test a lower target or a lower resolution/frame rate rather than assuming the NAS can compensate.
- Select an encoder/container deliberately. Confirm it supports looping a local file, the required output codec and 4K60, CBR, a two-second keyframe interval, compatible audio and RTMPS. Confirm how it expects the stream URL and key. No specific Docker image, command line or Synology deployment path is established by the official material cited here, so use the selected project’s own instructions for creating its container and mounting media.
Configure the YouTube stream and start the loop
- Create or open the live stream in YouTube’s live setup. Retrieve the ingest URL and stream key shown for that stream. Do not copy a fixed URL or key from a tutorial: use the values shown for your channel and current live setup.
- Keep the key private. Enter it only in the encoder’s stream-key field or its equivalent. If the encoder asks for separate values, provide the ingest URL and key in their respective fields; if it asks for one combined address, follow that encoder’s format. YouTube documents that tools may handle the ingestion URL and stream name separately or together.
- Set the output format. Select 3840×2160 (2160p), 60fps and one supported codec. Set CBR, the matching codec-specific bitrate from the table, a two-second keyframe interval, and AAC or MP3 audio. Choose RTMPS if supported by the encoder and supplied ingest endpoint.
- Enable file looping in the encoder. Point it to the media file available inside the container and enable repeat/loop playback using that encoder’s documented controls. Confirm that both video and audio are included in the outgoing stream.
- Start with a test, not an unattended broadcast. Start the encoder and check YouTube’s live preview and stream health before relying on it. YouTube’s API exposes configuration issue indicators; check for bitrate, resolution, frame-rate, codec, keyframe/GOP, audio or insufficient-video-input problems. YouTube recommends testing before going live and monitoring stream health.
- Verify the sustained run. Let a representative portion play long enough to see whether the NAS, container and upload connection remain stable, and confirm the video is still looping as intended. Only leave it unattended after the test shows the target stream is reaching YouTube correctly.
YouTube says 4K streams use normal latency rather than the low-latency option. If the low-latency setting is important to your use case, account for that limitation when choosing 4K.
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| Symptom | Likely checks and fixes |
|---|---|
| YouTube does not receive a signal | Check that the live setup’s current ingest URL and stream key are entered in the correct fields, that the key has not been exposed or replaced, and that the encoder is publishing to the expected endpoint. Verify RTMPS support and endpoint selection if using the secure protocol. |
| The stream starts but does not reach 4K60 | Check the outgoing resolution and frame rate in the encoder and YouTube stream health. A 4K60 source file does not prove the encoder is outputting 4K60; NAS capability is model- and implementation-dependent. |
| Bitrate or stream-health warnings appear | Match the bitrate to the outgoing codec: YouTube recommends 50 Mbps for H.264 4K60, and 35 Mbps for AV1/H.265 4K60. Check sustained upload capacity and use CBR as recommended. |
| Keyframe/GOP or codec errors appear | Check that the encoder is using a two-second keyframe interval and not exceeding four seconds, and that the outgoing video codec is supported. YouTube’s stream-health documentation lists open GOP and overlong keyframe intervals among possible issues. |
| Audio is missing or stream health flags it | Confirm the file’s audio is accessible to the container and that the encoder is sending AAC or MP3 audio. Verify the outgoing stream rather than relying only on playback in a local media player. |
| The video freezes, drops frames or the NAS struggles | Check the exact NAS and container encoding capability, hardware-encoding access, and sustained upload capacity. The cited sources do not establish that an unspecified Synology can encode this workload. Test at a lower resolution, frame rate or bitrate if the device or connection cannot sustain the target. |
| The loop stops after one play | Check the selected encoder’s file-loop setting and its container-visible media path. Looping behavior is specific to the encoder; follow that project’s documentation. |
Synology’s separate camera keyframe documentation concerns codec optimization for camera recordings and snapshots; it is not a Docker streaming configuration guide. See Synology’s keyframe interval guidance.
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