# Splitmuxsink Chunk Size
**URL:** https://discourse.gstreamer.org/t/splitmuxsink-chunk-size/5536
**Category:** General Discussion
**Created:** [November 24, 2025, 2:07pm UTC](https://discourse.gstreamer.org/t/splitmuxsink-chunk-size/5536 "2025-11-24T14:07:31Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@danijel00](https://discourse.gstreamer.org/u/danijel00)
#### Post date: [November 24, 2025, 2:07pm UTC](https://discourse.gstreamer.org/t/splitmuxsink-chunk-size/5536/1 "2025-11-24T14:07:31Z")
Hello, I’m using the **splitmuxsink** element to create an MP4 video.
If I set the property **max-size-bytes=8,000,000** , I get video chunks with a size of **6.3–6.5 MB**. Why is this happening?
According to the documentation, **1 MB should be 1,000,000 bytes** :
([https://gstreamer.freedesktop.org/documentation/multifile/splitmuxsink.html?gi-language=c#:~:text=10%20seconds%20and-,1MB%20maximum%20size.,-gst%2Dlaunch%2D1.0](https://gstreamer.freedesktop.org/documentation/multifile/splitmuxsink.html?gi-language=c#:~:text=10%20seconds%20and-,1MB%20maximum%20size.,-gst%2Dlaunch%2D1.0))
---
### Author:  [@tpm](https://discourse.gstreamer.org/u/tpm)
#### Post date: [November 24, 2025, 2:30pm UTC](https://discourse.gstreamer.org/t/splitmuxsink-chunk-size/5536/2 "2025-11-24T14:30:58Z")
What elements are before `splitmuxsink` here? (in particular: video encoder, and encoder configuration)
Could it be because of the configured key frame interval on the encoder?
---
### Author:  [@danijel00](https://discourse.gstreamer.org/u/danijel00)
#### Post date: [November 25, 2025, 7:26am UTC](https://discourse.gstreamer.org/t/splitmuxsink-chunk-size/5536/3 "2025-11-25T07:26:04Z")
> [@danijel00](#):
>
> max-size-bytes
I’m using something like this:
`queue ! capsfilter name=caps caps=video/x-raw,framerate=30/1,format=NV12 ! queue ! mfh265enc ! h265parse ! muxer.video`
However, I don’t think it has anything to do with the keyframe, because if I set `max-size-bytes=250,000,000` (250 MB), I get chunks of approximately 230 MB.