![]() ![]() However, the value can change depending on the streamer’s internet bandwidth and processing capabilities. It provides the best balance between quality and smoothness. Streamers need to make sure their stream is acceptable in quality and not choppy.įor this, a keyframe interval value of “2” in OBS is considered optimal. We cannot emphasize enough how important the correct keyframe interval is. Keyframe interval is important for streaming as it can create lag or it can cause streams to be pixelated. What is the importance of keyframe intervals in streaming? Using keyframes does not waste bandwidth but delta frames waste bandwidth as it records all the slight changes in a frame. On the other hand, a lower keyframe value will result in more artifacts. ![]() When we set a higher keyframe value, it will make the video clearer and reduce transmission artifacts. Keyframe is different from a delta frame. On the other hand, there is a delta frame, which is a “difference” frame that provides an incremental change from the previous frame. When a 60-frame-per-second video is recorded with a keyframe interval of 5, every 300 frames a keyframe is made. Keyframes are points in the video where the entire frame is sent instead of just the differences from the previous frame. A value above 4 will cause the stream to lag a lot as it will take higher bandwidth. For a 30-frame-per-second video, the keyframe interval value should not exceed 4. If a streamer is streaming a 1080p video in 25 or 30 fps then a keyframe interval value of 2 is optimal.Īs in this situation, a keyframe interval of 2 means that it takes at most 2 seconds for the viewers to catch up to a point where they can properly display the feed. This value is not good for streaming, for streaming a keyframe interval value should be set according to the frame rate and bitrate of the stream. The value of 0 or automatic is usually around 8 seconds. The keyframe interval value of 0 means that the stream is set to automatic instead of 0 seconds. The correct keyframe interval is set based on the streamer and their requirements from a stream. How to set the correct keyframe interval? But the optimal keyframe interval value can vary in different scenarios.įor streaming, a higher keyframe interval is not needed but while recording a higher keyframe interval should be selected. So, in the short term, a lower keyframe interval value will affect the video quality negatively and a higher keyframe value should affect the video quality positively. ![]() However, in return, it will take less processing power to finish the job. On the other hand, a lower keyframe interval value will cause more artifacts. A higher keyframe interval value will make the video more stable and essen the artifacts.īut a higher keyframe interval will need more bandwidth and more GPU power as it needs to compress more bits per second. Setting the right keyframe interval is very important. How does keyframe interval affect video quality? While streaming, a lower keyframe interval is usually recommended. It saves a lot of time and puts less pressure on the computer to decode a video. For a 30-frame-per-second video with the keyframe interval set to 2 seconds, every 60 frames a frame or an image will be rendered. If a 30-frame-per-second video file is given, 30 frames are being shown in a second. For example, a keyframe interval value of 2 means that a full video frame will be rendered every 2 seconds. Keyframes are points in a video where the entire frame is sent instead of just the differences from the previous frame. What is the importance of keyframe intervals in streaming?.How to set the correct keyframe interval?.How does keyframe interval affect video quality?.The issue may become more common when using the "Advanced Scene Switcher" plugin's macros to quickly start and stop the buffers. Replay buffer occasionally uses a non-key frame on the first frame of a saved buffer, resulting in missing data and video smearing. When the replay buffer starts with a format that uses inter-frame compression, the first frame of the replay buffer should always be a keyframe / whole frame, not an interpolated frame. ![]()
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