# Transform and Transcode use cases Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The transcoding use cases show converting or transforming the video streams from one format to another. Before you run the use cases, ensure that you complete the preconditions mentioned in [GStreamer command-line use cases](https://docs.qualcomm.com/doc/80-80020-50/topic/gstreamer-application-use-cases.html). Note: The Qualcomm Computer Vision SDK (fcv) engine is currently not supported. ## 1080p to 1080p–rotate (90/180/270) Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows the rotation of scenes from a camera by 180 degrees. The rotated image is displayed on a local display device. Note: This section isn’t applicable for the QLI 2.0 RC1 release. Note: To rotate the video at different angles, use the rotate property from the [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html) plugin. Use the following commands to run the use case on the target device: - Transform the scene running on DSP using Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! qtivtransform engine=fcv rotate=180 ! waylandsink fullscreen=true async=false sync=falseCopy to clipboard - Transform the scene running on the GPU using OpenGL ES: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! qtivtransform engine=gles rotate=180 ! waylandsink fullscreen=true async=false sync=falseCopy to clipboard The host camera displays the transformed stream. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for rotation and display–camera source Qualcomm Open source qtivtransform waylandsink camsrc ## Offline 1080p stream to 1080p–rotate (90/180/270) Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows the rotation of scenes from a file source by 180 degrees. The rotated scene is displayed on a local display device. Note: To rotate the video at different angles, see the rotate property from [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Transform the scene running on DSP using Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e filesrc location=/opt/.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=fcv rotate=180 ! queue ! waylandsink fullscreen=trueCopy to clipboard - Transform the scene running on the GPU using OpenGL ES: gst-launch-1.0 -e filesrc location=/opt/.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=gles rotate=180 ! queue ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from the file source is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for rotation and display–file source Qualcomm Open source GST BIN filesrc qtdemux h264parse v4l2h264dec qtivtransform waylandsink ## 4K to 1080p–rotate (90/180/270) and downscale Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows a 4k resolution video stream from a camera downscaled to 1080p and rotated by 180 degrees. The video is then displayed on a local display device. Note: This section isn’t applicable for the QLI 2.0 RC1 release. Note: To rotate the video at different angles, see the rotate property from [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv rotate=180 ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles rotate=180 ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from the camera is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for 4k image downscaled to 1080p, rotated, and displayed–camera source Qualcomm Open source qtivtransform Waylandsink camsrc ## Offline 4K to 1080p–rotate (90/180/270) and downscale Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The pipeline shows a 4k resolution video stream from a file source downscaled to 1080p and rotated by 180 degrees. The video is then displayed on a local display device. Note: To rotate the video at different angles, see the rotate property from [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=fcv rotate=180 ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard - GLES engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=gles rotate=180 ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from the file source is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for 4k stream downscaled to 1080p, and rotated, and displayed–file source Qualcomm Open source GST BIN filesrc qtdemux h264parse v4l2h264dec qtivtransform waylandsink ## 1080p to 1080p–horizontal and vertical flip Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows how to flip the scenes of a camera stream horizontally. Note: This section isn’t applicable for the QLI 2.0 RC1 release. Note: To flip the scenes, in the following commands, replace `flip-horizontal` with `flip-vertical` and vice versa. For more information, see [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! qtivtransform engine=fcv flip-horizontal=true ! waylandsink fullscreen=trueCopy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! qtivtransform engine=gles flip-horizontal=true ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from a camera is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for displaying flipped images–camera source Qualcomm Open source qtivtransform waylandsink camsrc ## Offline 1080p to 1080p–horizontal and vertical flip Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows how to flip scenes horizontally. Note: To flip the scenes, in the following commands, replace `flip-horizontal` with `flip-vertical` and vice versa. For more information, see [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e filesrc location=/opt/<1080p_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=fcv flip-horizontal=true ! waylandsink fullscreen=trueCopy to clipboard - GLES engine: gst-launch-1.0 -e filesrc location=/opt/<1080p_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=gles flip-horizontal=true ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from a file source is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for displaying flipped images–file source Qualcomm Open source GST BIN filesrc qtdemux h264parse v4l2h264dec qtivtransform waylandsink ## 4K to 1080p–horizontal and vertical flip with downscale Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case shows how to downscale a 4k resolution video stream to 1080p and flip the scenes horizontally. Note: This section isn’t applicable for the QLI 2.0 RC1 release. Note: To flip the scenes, in the following commands, replace `flip-horizontal` with `flip-vertical` and vice versa. For more information, see [qtivtransform](https://docs.qualcomm.com/doc/80-80020-50/topic/qtivtransform.html). Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv flip-vertical=true ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles flip-vertical=true ! video/x-raw,format=NV12,width=1920,height=1080 ! waylandsink fullscreen=trueCopy to clipboard The transformed stream from the camera is displayed. To stop the use case, use CTRL + C. The following figure shows the flow of the pipeline execution: Figure : Pipeline for displaying flipped and downscaled images–camera source Qualcomm Open source qtivtransform waylandsink camsrc ## Downscale 4K to 1080p and encode to AVC MP4 Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) The use case uses two copies of a 4k resolution video stream. The first copy is encoded and multiplexed to an MP4 file. A second copy is shared with qtivtransform to downscale it to 1080p resolution. The 1080p stream is then encoded and multiplexed to an MP4 file on the device. Note: This section isn’t applicable for the QLI 2.0 RC1 release. Use the following commands to run the use case on the target device: - Qualcomm Computer Vision SDK (fcv) engine: Note: This use case isn't supported on the Ubuntu Server. gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! tee name=t_split t_split. ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/4k_video.mp4 t_split. ! qtivtransform engine=fcv ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/downscaled_1080p_video.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! tee name=t_split t_split. ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/4k_video.mp4 t_split. ! qtivtransform engine=gles ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/downscaled_1080p_video.mp4Copy to clipboard To stop the use case, use CTRL + C. Pull the recorded content from the target device and play content on the Linux host computer. In the terminal of the host computer, run the following command: scp root@:/opt/ Copy to clipboard In the terminal of the host computer, run the following command to pull the file content: scp -r root@[DEVICE IP-ADDR]:/opt/4k_video.mp4 user1@[HOST IP-ADDR]:/workspaceCopy to clipboard scp -r root@[DEVICE IP-ADDR]:/opt/downscaled_1080p_video.mp4 user1@[HOST IP-ADDR]:/workspaceCopy to clipboard You can play the MP4 files on a media player. The camera stream is displayed. The following figure shows the flow of the pipeline execution: Figure : Pipeline for 4k video–encoding and downscaling to 1080p Qualcomm Open source h264parse mp4mux filesink v4l2h264enc v4l2h264enc h264parse mp4mux filesink tee qtivtransform camsrc ## More transform and transcode use cases Source: [https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html](https://docs.qualcomm.com/doc/80-80020-50/topic/transform-and-transcode-use-cases.html) Run the following use cases on the target device. ### Video transform use cases Note: The Video\_qmmf use cases aren’t available in the QLI 2.0 RC1 release. - 4K@30 AVC → decode → rotate and downscale → 1080p@30 AVC - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=fcv rotate=90CCW ! video/x-raw,format=NV12,width=1920,height=1080 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=gles rotate=90CCW ! video/x-raw,format=NV12,width=1920,height=1080 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - 4K@30 AVC → decode → flip and downscale → 1080p@30 AVC - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=fcv flip-vertical=true ! video/x-raw,format=NV12,width=1920,height=1080 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw,format=NV12 ! qtivtransform engine=gles flip-vertical=true ! video/x-raw,format=NV12,width=1920,height=1080 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - Video\_qmmf\_Transform\_rotate\_counter\_clockwise\_3840 x 2160 @30fps - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv rotate=90CCW ! queue ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles rotate=90CCW ! queue ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - Video\_qmmf\_Transform\_scale\_down\_3840 x 2160 @30fps\_to\_1080p - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv ! queue ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles ! queue ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video.mp4Copy to clipboard - Video\_qmmf\_Transform\_flip\_horizontal\_3840 x 2160 @30fps - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv flip-horizontal=true ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video_flip_h.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles flip-horizontal=true ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video_flip_h.mp4Copy to clipboard - Video\_qmmf\_Transform\_flip\_vertical\_3840 x 2160 @30fps - Qualcomm Computer Vision SDK (fcv) engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=fcv flip-vertical=true ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video_flip_v.mp4Copy to clipboard - GLES engine: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1 ! qtivtransform engine=gles flip-vertical=true ! video/x-raw,format=NV12,width=3840,height=2160,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/video_flip_v.mp4Copy to clipboard ### Video transcode use cases - 4k@30 HEVC → decode → 4k@30 AVC encode: gst-launch-1.0 -e filesrc location=/opt/<4K_H265/HEVC_file>.mp4 ! qtdemux ! queue ! h265parse ! v4l2h265dec capture-io-mode=4 output-io-mode=4 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! queue ! h264parse ! mp4mux ! queue ! filesink location=/opt/offline_hevc_to_avc.mp4Copy to clipboard - 4k@30 AVC → decode → 4k@30 HEVC encode: gst-launch-1.0 -e filesrc location=/opt/<4K_H264/AVC_file>.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! v4l2h265enc capture-io-mode=4 output-io-mode=5 ! queue ! h265parse ! mp4mux ! queue ! filesink location="/opt/offline_avc_to_hevc.mp4"Copy to clipboard ### Dynamic cropping using qtivtransform **Single 1080p file stream from which the ROI is cropped** 1. Display the stream: gst-launch-1.0 filesrc location=/opt/.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! queue ! qtivtransform flip-vertical=true crop="<480,270,960,540>" ! waylandsink fullscreen=trueCopy to clipboard 2. Encode the stream data: gst-launch-1.0 -e filesrc location=/opt/.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! queue ! qtivtransform flip-horizontal=true crop="<480,270,960,540>" ! queue ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/offline_crop_vtransform.mp4Copy to clipboard **Single 1080p camera stream from which ROI is cropped** Note: This use case isn't available in the QLI 2.0 RC1 release. 1. Display the stream: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! queue ! qtivtransform flip-horizontal=true crop="<480,270,960,540>" ! waylandsink fullscreen=trueCopy to clipboard 2. Encode the stream data: gst-launch-1.0 -e qtiqmmfsrc ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! qtivtransform flip-horizontal=true crop="<480,270,960,540>" ! queue ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1,interlace-mode=progressive,colorimetry=bt601 ! v4l2h264enc capture-io-mode=4 output-io-mode=5 ! h264parse ! queue ! mp4mux ! queue ! filesink location=/opt/cam_crop_vtransform.mp4Copy to clipboard ### Related information [Video transcoding](https://docs.qualcomm.com/doc/80-80020-50/topic/gst-video-transcode-example.html) Last Published: Mar 02, 2026 [Previous Topic Multi-camera/Multi-client use cases](https://docs.qualcomm.com/bundle/publicresource/80-80020-50/topics/multi-camera-multi-client-use-cases.md) [Next Topic Video playback use cases](https://docs.qualcomm.com/bundle/publicresource/80-80020-50/topics/video-playback-use-cases.md)