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Find the recommended bitrate for your output
The figures below are YouTube’s recommended live-encoder ingestion bitrates, not recommendations for uploading a finished video. Identify the codec actually sent to YouTube, then match the output resolution and frame rate. The values are platform guidance, not a measurement of your particular Azure VM or stream. Source: YouTube Help: Choose live encoder settings, bitrates, and resolutions (accessed October 3, 2026).
| Output | H.264 | AV1 or H.265/HEVC |
|---|---|---|
| 720p at 30 fps | 8 Mbps | 6 Mbps |
| 720p at 60 fps | 8 Mbps | 6 Mbps |
| 1080p at 30 fps | 14 Mbps | 10 Mbps |
| 1080p at 60 fps | 17 Mbps | 12 Mbps |
| 1440p at 30 fps | 21 Mbps | 15 Mbps |
| 1440p at 60 fps | 34 Mbps | 24 Mbps |
| 2160p (4K) at 30 fps | 42 Mbps | 30 Mbps |
| 2160p (4K) at 60 fps | 50 Mbps | 35 Mbps |
YouTube’s table also includes minimum rates; do not mistake a minimum for its recommended target. If you are unsure what FFmpeg is sending, inspect the output codec and dimensions in your command and encoder settings before choosing a row. The appropriate bitrate depends on the encoded output, not simply the resolution of the source file.
Check whether the Azure VM can sustain it
YouTube recommends leaving 20% upload-bandwidth headroom and cautions that download speed is not a substitute for checking upload speed. For a 17 Mbps video target, for example, the stream’s total outbound traffic must fit comfortably below the VM’s sustained upload capacity. Audio and protocol overhead count toward that total, as do other streams or concurrent outbound transfers. Source: YouTube Help: Streaming tips (accessed October 3, 2026).
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- Measure sustained outbound throughput from the Azure VM to the internet under conditions representative of the actual stream. Do not infer it from a local computer’s result or from download speed.
- Allow the recommended headroom above the total stream bitrate, including audio and overhead, and account for other traffic sharing the VM or network path.
- Run a private or unlisted test using the intended resolution, frame rate, codec, and workload. Watch YouTube’s stream health and FFmpeg’s output for dropped frames or interruptions.
- If sustained capacity falls short, lower the output bitrate or choose a lower resolution or frame rate, then test again. Do not assume a particular Azure VM size or region has a universal egress rate: the relevant throughput has not been established for your VM and destination path.
Set FFmpeg’s bitrate and keyframe cadence
In FFmpeg, -b:v sets the target video bitrate for encoders such as libx264. Generic rate-control options include -minrate, -maxrate, and -bufsize; FFmpeg documents CBR behavior when minimum and maximum rates match the target. YouTube specifies CBR, recommends a two-second keyframe interval, and says the interval should not exceed four seconds. FFmpeg’s -g sets the maximum GOP size, so for a two-second cadence use a GOP of about twice the frame rate: 120 frames at 60 fps or 60 frames at 30 fps. Consult the help for your installed FFmpeg build and chosen encoder because available options and behavior can vary. Source: FFmpeg Documentation (regenerated nightly; accessed October 3, 2026).
Illustrative H.264 command for 1080p60
This is a starting template, not a tested configuration for a particular VM. Replace the input, audio settings, and stream destination/key; confirm that your encoder produces 1080p60 H.264 and that measured outbound capacity supports the total bitrate.
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ffmpeg -re -i INPUT
-c:v libx264 -preset veryfast -pix_fmt yuv420p
-b:v 17M -minrate 17M -maxrate 17M -bufsize 34M -g 120
-c:a aac -b:a 128k -ar 44100
-f flv 'rtmps://a.rtmps.youtube.com/live2/STREAM_KEY'The 17 Mbps target corresponds to YouTube’s H.264 recommendation for 1080p60; -g 120 corresponds to two seconds at 60 fps. At 30 fps, a two-second GOP would be 60 frames. Recalculate the GOP for other frame rates and select the matching bitrate for other output formats. The veryfast preset is an example, not a guarantee that your VM can encode the stream in real time; check CPU load and encoder performance during the test.
If the picture still looks poor
Once bitrate, outbound capacity, and keyframe cadence are aligned, investigate other causes rather than increasing -b:v automatically. The available information does not identify your Azure SKU, region, command, source material, or YouTube health warnings, so no VM-specific diagnosis is possible.
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- Unstable stream or dropped frames: compare sustained outbound capacity with total stream traffic, including concurrent transfers. Reduce the bitrate or output demands if capacity is insufficient.
- Soft or blocky image despite stable delivery: check whether the source is already low quality, whether FFmpeg is scaling it, and whether the chosen output resolution is appropriate. A larger bitrate cannot restore detail absent from the source.
- Irregular motion or stuttering: verify the actual frame rate and inspect FFmpeg for frame drops; a bitrate choice does not correct an encoding or timing problem by itself.
- Encoder struggling: inspect VM CPU saturation and whether the selected encoder can keep up in real time. No performance result for a specific Azure VM is established here.
- YouTube reports a stream-health problem: use the health warning alongside FFmpeg logs and the VM’s network measurements to identify whether the issue is delivery, encoding, or configuration before changing several settings at once.
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