# 视频合成用例
Source: [https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html](https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html)
视频合成 GStreamer 用例展示了如何从源读取多个视频流，对其进行合成，然后在显示设备上以并排或画中画方式显示。
在运行用例之前，请确保完成[运行多媒体用例](https://docs.qualcomm.com/doc/80-70020-50SC/topic/multimedia-use-cases.html)中提到的先决条件。
## 16 路 480p 离线流并排合成
Source: [https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html](https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html)
用例展示了如何从文件源读取 16 路 480p 视频流并进行并排合成。然后，这些流在本地显示设备上显示为单个帧。
运行用例：
ulimit -n 4096 && gst-launch-1.0 qtivcomposer name=mix sink_0::position="<0, 0>" sink_0::dimensions="<480, 270>" sink_1::position="<480, 0>" sink_1::dimensions="<480, 270>" sink_2::position="<960, 0>" sink_2::dimensions="<480, 270>" sink_3::position="<1440, 0>" sink_3::dimensions="<480, 270>" sink_4::position="<0, 270>" sink_4::dimensions="<480, 270>" sink_5::position="<480, 270>" sink_5::dimensions="<480, 270>" sink_6::position="<960, 270>" sink_6::dimensions="<480, 270>" sink_7::position="<1440, 270>" sink_7::dimensions="<480, 270>" sink_8::position="<0, 540>" sink_8::dimensions="<480, 270>" sink_9::position="<480, 540>" sink_9::dimensions="<480, 270>" sink_10::position="<960, 540>" sink_10::dimensions="<480, 270>" sink_11::position="<1440, 540>" sink_11::dimensions="<480, 270>" sink_12::position="<0, 810>" sink_12::dimensions="<480, 270>" sink_13::position="<480, 810>" sink_13::dimensions="<480, 270>" sink_14::position="<960, 810>" sink_14::dimensions="<480, 270>" sink_15::position="<1440, 810>" sink_15::dimensions="<480, 270>" mix. ! queue ! waylandsink sync=true fullscreen=true filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! queue ! mix.Copy to clipboard
要停止用例，请按 CTRL + C。
Figure : 并排显示 16 路 480p 视频流 pipeline - 文件源
## 1080p + 1080p 离线画中画合成
Source: [https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html](https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html)
该用例展示了将两路 1080p 流合成画中画显示的过程。这两个 1080p 流是从两个文件源读取的。
运行用例：
gst-launch-1.0 -e qtivcomposer name=mixer sink_0::position="<0, 0>" sink_0::dimensions="<1280, 720>" sink_1::position="<590, 310>" sink_1::dimensions="<640, 360>" mixer. ! queue ! waylandsink fullscreen=true filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! mixer. filesrc location=/tmp/Animals_000_720p_180s_30FPS.mp4 ! qtdemux ! queue ! h264parse ! v4l2h264dec capture-io-mode=4 output-io-mode=4 ! video/x-raw, format=NV12 ! mixer. Copy to clipboard
要停止用例，请按 CTRL + C。
Figure : 1080p 流的画中画显示 pipeline - 文件源
## 1080p 实时摄像头和 1080p 离线画中画合成
Source: [https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html](https://docs.qualcomm.com/doc/80-70020-50SC/topic/video-composition.html)
用例展示了将两路 1080p 流合成画中画显示的过程。第一个 1080p 流是从文件源读取的。第二个流是从摄像头采集的。
运行用例：
gst-launch-1.0 -e qtivcomposer name=mixer sink_0::position="<0, 0>" sink_0::dimensions="<1280, 720>" sink_1::position="<590, 310>" sink_1::dimensions="<640, 360>" mixer. ! queue ! waylandsink fullscreen=true qtiqmmfsrc name=camsrc video_0::type=video video_1::type=preview ! video/x-raw,format=NV12,width=1920,height=1080,framerate=30/1 ! mixer. 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 ! mixer.Copy to clipboard
要停止用例，请按 CTRL + C。
Figure : 1080p 流的画中画显示 pipeline - 文件源和摄像头源
### 相关信息
[视频合成](https://docs.qualcomm.com/doc/80-70020-50SC/topic/gst-weston-composition-example.html)
Last Published: Jul 23, 2025
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