The Tool Desk
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Identify what “stops” means
At the failure time, establish which symptom occurred and note the timestamp and timezone. YouTube says stopping content from the encoder ends a stream; for scheduled streams, an operator can also end it in Live Control Room. Compare the live watch page, Live Control Room status, encoder output, and what viewers saw rather than treating “the stream stopped” as a single diagnosis. YouTube: Start or stop a live stream
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- Broadcast ended: the watch page stopped updating and Live Control Room showed an ended or offline state.
- Encoder stopped or disconnected: the encoder process exited, reported an error, or lost its connection.
- Playback issue: the live status remained active while one or more viewers saw buffering or an error.
- Archive missing: the live event ended, but no recording appeared afterward.
Do not confuse the last case with a live-stream termination. YouTube automatically archives eligible streams shorter than 12 hours, but warns that a stream exceeding 12 hours may not be captured at all. That is an archive caveat, not a stated maximum live-stream duration. YouTube: Find and watch live streams
Build a timeline from YouTube and EC2 evidence
Use the same time window across all evidence. Record when symptoms began, when they cleared, and whether anyone restarted the encoder or stream. A timeline can distinguish a YouTube ingest or status event from a local encoder failure or an outbound network issue.
Check YouTube Live Control Room
- Open the event in YouTube Live Control Room and review stream health and the messages shown during the incident.
- Compare their timestamps with the watch page status and reports from viewers. If only one viewer had trouble, do not infer that the broadcast ended; check the live status first.
- Save the relevant messages and event timestamps before restarting anything, so they can be compared with host and encoder logs.
YouTube recommends testing before going live and monitoring stream health during the event. YouTube: Encoder settings, bitrates, and resolutions
Check the encoder and EC2 host
- Inspect the encoder’s logs and service status around the failure. Look for process exit, encoder errors, disconnects, and reconnect attempts.
- Check CPU load and whether the encoder continued producing output. YouTube’s troubleshooting guidance recommends checking encoder errors and CPU load; if the encoder appears healthy, test the outbound internet connection. YouTube: Troubleshoot live stream issues
- Correlate operating-system and service logs with EC2 network metrics for the same timestamps. AWS says CloudWatch instance metrics and ENA driver network-performance metrics can help expose bandwidth, packet activity, and exceeded instance-level network allowances.
- If the instance itself became unreachable, review EC2 console output for clues such as kernel or service-configuration problems. AWS: Troubleshoot Amazon EC2 instances
Short network microbursts may not be visible in standard CloudWatch periods. A metric that looks normal at a coarse interval does not by itself rule out a brief problem; use the most granular relevant measurements available and compare them with encoder and YouTube timestamps. AWS: Network bandwidth
Test whether EC2 bandwidth behavior fits the timeline
Network burst exhaustion is a hypothesis to check against the exact instance type and measurements—not a default explanation for a stream that fails after a few hours. AWS documents that bandwidth depends on instance type and network allowances. Some smaller instance types marked “up to” use network I/O credits; when those credits are exhausted, bandwidth returns to baseline. AWS describes typical burst durations as 5–60 minutes depending on instance size, not as a universal failure time. AWS: Network bandwidth
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- Identify the precise EC2 instance type and check its documented baseline and burst behavior.
- At the failure timestamp, inspect network performance and allowance metrics for evidence of bandwidth limits, exceeded allowances, or packet drops.
- Check whether other traffic on the instance shared the outbound path and whether the actual streaming bitrate fit the available bandwidth with headroom.
- Compare the metric evidence with encoder logs and YouTube stream-health messages. A burst-credit explanation is credible only if the instance’s documented behavior and observed metrics fit the event.
YouTube says total streaming bitrate should fit within available upload bandwidth and recommends leaving headroom; it also warns that a connectivity disruption can break a stream. For an encoder in EC2, assess the instance’s effective outbound path and competing traffic—not a home-internet speed test. YouTube: Encoder settings, bitrates, and resolutions
Review encoder settings without treating them as a diagnosis
Correct settings reduce avoidable instability, but they do not identify why a particular broadcast stopped. YouTube’s published guidance lists RTMP and RTMPS protocol options and recommends RTMPS, constant bitrate (CBR), and a two-second keyframe interval, with four seconds as the maximum. Its bitrate recommendations vary by codec, resolution, and frame rate, so select the recommendation for the actual profile instead of applying one bitrate to every stream. YouTube: Encoder settings, bitrates, and resolutions
- Confirm the encoder is using the intended YouTube stream key and the protocol configured for the event.
- Check that bitrate mode is CBR and the keyframe interval is two seconds where practical, never more than four seconds under YouTube’s stated guidance.
- Use YouTube’s bitrate guidance for the chosen codec, resolution, and frame rate, and ensure the effective EC2 outbound path can sustain the total bitrate with headroom.
- Test beforehand with representative motion and audio, then monitor stream health during the live event.
Add failover only after documenting the primary failure
A backup encoder can reduce dependence on one encoder path for important broadcasts, but it is a resilience measure—not an explanation for why the primary stopped. YouTube recommends exercising failover by stopping the primary encoder or disconnecting its Ethernet cable and confirming that the player rolls over to the backup. Test this before relying on it for a live event. YouTube: Tips to stream with an encoder
Troubleshoot by symptom
| What you observe | Evidence to check | Next action |
|---|---|---|
| Live Control Room shows the event ended or offline | Watch page status, YouTube stream-health messages, and encoder timestamps | Determine whether the encoder stopped sending or the scheduled stream was ended in Live Control Room before changing EC2 settings. |
| Encoder exited or logged an error | Encoder and service logs, CPU load, and host logs at the same time | Investigate the specific process or host error; compare it with YouTube’s stream-health messages. |
| Encoder appears healthy but YouTube reports poor or lost connection | Outbound network measurements, packet activity, allowance metrics, and concurrent traffic | Test the EC2 outbound path and compare actual bitrate and bandwidth behavior with the instance’s documented allowances. |
| Only some viewers report buffering while the event remains live | Live Control Room status and reports from more than one viewer | Do not label it a terminated broadcast without evidence; first establish whether the issue is limited to viewer playback. |
| Live stream ended but no archive appeared | Stream duration and archive availability | Account for YouTube’s warning that streams exceeding 12 hours may not be captured; missing archive alone does not establish when or why the live event ended. |
| Metrics look normal but the interruption was brief | Higher-resolution network evidence, ENA metrics, and time-aligned encoder logs | Consider that short microbursts may not appear in standard CloudWatch periods; do not treat coarse metrics as conclusive. |
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