3,260
edits
Changes
gstreamer video caputre/encoding pipelines added
</pre>
[[File:PiPstreaming.jpg|400px]]
==== Video capture and encoding ====
===== V4L2 1080p60 Capture/HDMI display =====
* Description:
** 1080p60 video is captured from VIN0A using v4l2src gstreamer component
** output displayed on HDMI at the same resolution
<pre class="board-terminal">
gst-launch -v v4l2src device="/dev/video0" always-copy=false queue-size=6 num-buffers=-1 ! 'video/x-raw-yuv-strided,format=(fourcc)NV12,width=1920,height=1080,framerate=(fraction)60/1' ! omxbufferalloc silent=false numBuffers=6 ! omx_scaler ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60 ! gstperf ! omx_videosink sync=false
</pre>
===== V4L2 1080p60 Capture/H264 encoding/HDMI display =====
* Description:
** 1080p60 video is captured from VIN0A using v4l2src gstreamer component
** DEI/Scaler is used to split the source
** the former goes to H264 encoder (result saved to file)
** the latter goes to HDMI output
<pre class="board-terminal">
gst-launch v4l2src device="/dev/video0" always-copy=false queue-size=12 num-buffers=1000 ! 'video/x-raw-yuv-strided,format=(fourcc)NV12,width=1920,height=1080,framerate=(fraction)60/1' ! omxbufferalloc silent=false numBuffers=12 ! omx_mdeiscaler name=d d.src_01 ! omx_h264enc force-idr-period=300 i-period=100 bitrate=5000000 ! filesink location=v4l2cap.h264 d.src_00 ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60 ! gstperf ! omx_videosink display-mode=OMX_DC_MODE_1080P_60
</pre>
===== V4L2 Capture, decimanted =====
* Description
** 1080p50 video is captured from VIN1A using v4l2src
** input is decimated to 10 fps, using the same v4l2src
** output is displayed on HDMI
<pre class="board-terminal">
gst-launch -v v4l2src device="/dev/video2" always-copy=false queue-size=12 num-buffers=-1 decimate=5 ! 'video/x-raw-yuv-strided,format=(fourcc)NV12,width=1920,height=1080,framerate=(fraction)50/1' ! omxbufferalloc silent=false numBuffers=12 ! omx_scaler ! omx_ctrl display-mode=OMX_DC_MODE_1080P_60 ! gstperf ! omx_videosink sync=false
</pre>
===v4l2-based applications===
This section provides some examples of applications based on well-known [http://en.wikipedia.org/wiki/Video4Linux|Video4Linux API].
