Stutter on AWS IVS(real-time) RTMP Publishing

[jeekpark]

Hello, Sir.

I'm encountering an intermittent stutter (brief buffering or playback freeze) when publishing RTMP streams to AWS IVS. The same stream configuration works fine with AWS MediaLive, but AWS IVS(real-time) consistently exhibits this stutter. Below are my current encoder settings and environment details:

Environment & Settings: (Tried things...)

• Platform: Android
• Encoder Library: SrsEncoder (latest commit)
• Video Settings:
  • Codec: H.264
  • Profile: Baseline
    (We set the "profile" to MediaCodecInfo.CodecProfileLevel.AVCProfileBaseline to disable B-frames)

        videoFormat.setInteger("profile", MediaCodecInfo.CodecProfileLevel.AVCProfileBaseline);
        videoFormat.setInteger("level", MediaCodecInfo.CodecProfileLevel.AVCLevel3); 

• Keyframe Interval (IDR Interval):
  VGOP = 48 and VFPS = 24 (i.e., a 2-second interval; we have also tested with a 1-second interval)
• x264 Preset: "veryfast,zerolatency,b-frames=0, sliced-threads=0"

    public void setVideoHDMode() {
        vBitrate = 1200 * 1024;  // 1200 kbps
        x264Preset = "veryfast,zerolatency,bframes=0,sliced-threads=0";
    }

• Resoultion: 1280 * 720
• Bitrate: 1200 kbps

Current Situation:

• The methods onGetPcmFrame and onGetRgbaFrame in SrsEncoder log normal frame cache values and steadily increasing presentation timestamps (PTS), with no apparent issues in encoding or buffer processing.
• When publishing via AWS MediaLive, the stream plays without stutter. However, when publishing to AWS IVS, the viewer experiences a brief stutter every second.
• The AWS IVS RTMP Publishing documentation recommends a keyframe interval of 1–2 seconds, disabling B-frames, and using a lower maximum bitrate (e.g., below 6 Mbps) to prevent stream disconnects. We have applied these recommended settings.

Please

• Are there any additional encoding settings or stream configuration adjustments we should consider to mitigate the 1-second stutter on AWS IVS?

We have implemented all the recommended settings (keyframe interval of 1–2 seconds, B-frame disablement via Baseline profile, and a conservative maximum bitrate) as outlined in the documentation, yet the issue persists.

Thank you for your assistance.

---

Reference

https://docs.aws.amazon.com/ivs/latest/RealTimeUserGuide/rt-stream-ingest.html

[begeekmyfriend]

Sorry for my late responding. Maybe this comment could help you with your question. It seems that you need to set some parameters on AWS.