# Slice-based encoding

Source: [https://docs.qualcomm.com/doc/80-70014-50/topic/slice-based-encoding.html](https://docs.qualcomm.com/doc/80-70014-50/topic/slice-based-encoding.html)

With slice support for video encoding, the video stream is divided or sliced into
        multiple separate sections so that you can encode them in parallel.

Use the commands in the following sections to implement slice-based encoding on a camera
            stream.

## H.264

- 1280x720, maximum slices per frame =
                    10:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1;" ! filesink location="/opt/encoded.h264"Copy to clipboard
- 1280x720, slices per frame =
                    8:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1,number_of_mbs_in_a_slice=460;" ! filesink location="/opt/encoded.h264"Copy to clipboard
- 1920x1080, slices per frame
                    =3:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1920,height=1080,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1,number_of_mbs_in_a_slice=2720;" ! filesink location="/opt/encoded.h264"Copy to clipboard
- 1280x720, Max Bytes
                    mode:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=2;" ! filesink location="/opt/encoded.h264"Copy to clipboard

## H.265

- 1280x720, maximum slices per frame =
                    10:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h265enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1;" ! filesink location="/opt/encoded.h265"Copy to clipboard
- 1280x720, slices per frame =
                    8:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h265enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1,number_of_mbs_in_a_slice=460;" ! filesink location="/opt/encoded.h265"Copy to clipboard
- 1920x1080, slices per frame =
                    3:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1920,height=1080,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h265enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=1,number_of_mbs_in_a_slice=2720;" ! filesink location="/opt/encoded.h265"Copy to clipboard
- 1280x720, Max Bytes
                    mode:

        gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw\(memory:GBM\),format=NV12,width=1280,height=720,framerate=30/1,compression=ubwc,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h265enc capture-io-mode=5 output-io-mode=5 extra-controls="controls,slice_partitioning_method=2;" ! filesink location="/opt/encoded.h265"Copy to clipboard

**Parent Topic:** [Camera and video encode](https://docs.qualcomm.com/doc/80-70014-50/topic/camera-and-video-encode.html)

Last Published: Oct 27, 2025

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