tranthamp · October 25, 2012 16:02 · Oct 25, 2012
diff --git a/gistfile1.txt b/gistfile1.txt
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+// I'm using a virtual video capture device via the vivi kernel module
+# modprobe vivi
+
+// This creates /dev/video0 if no other devices have yet been enumerated.
+
+// Display available formats for the video device
+# yavta --enum-formats /dev/video0
+Device /dev/video0 opened.
+Device `vivi' on `vivi-000' is a video capture device.
+- Available formats:
+        Format 0: YUYV (56595559)
+        Type: Video capture (1)
+        Name: 4:2:2, packed, YUYV
+
+        Format 1: UYVY (59565955)
+        Type: Video capture (1)
+        Name: 4:2:2, packed, UYVY
+
+        Format 2: RGB565 (50424752)
+        Type: Video capture (1)
+        Name: RGB565 (LE)
+
+        Format 3: RGB565X (52424752)
+        Type: Video capture (1)
+        Name: RGB565 (BE)
+
+        Format 4: RGB555 (4f424752)
+        Type: Video capture (1)
+        Name: RGB555 (LE)
+
+        Format 5: RGB555X (51424752)
+        Type: Video capture (1)
+        Name: RGB555 (BE)
+
+Video format: RGB565 (50424752) 640x480 (stride 1280) buffer size 614400
+
+// Choose a format and dimensions, then use yavta to capture and dump some frames
+# yavta -f RGB565 -s 640x480 -n 4 --capture=5 -F /dev/video0
+
+// This command will capture 5 frames (--capture=5) using 4 buffers (-n 4) with a
+// size of 640x480 (-s 640x480) in the rgb565 little endian format (-f RGB565),
+// then it will dump them to files (-F) named frame-00000x.bin
+
+// Change the file extensions to indicate the format (required for conversion by ffmpeg)
+# mv frame-000001.{bin,rgb}
+
+// To display the raw 16-bit rgb files, I convert them to the png format using ffmpeg
+# ffmpeg -s 640x480 -pix_fmt rgb565le -i frame-000001.rgb -f image2 -pix_fmt rgb24 frame1.png