imaging/getting-started-with-image-streams.md

@@ -8,6 +8,10 @@ If your laptop or desktop has a webcam, try:
 ```
 **view;null** above means: view image stream, then output nothing to stdout.
 
+If you don't have a webcam, pick some video and use **--file some-video.mp4** instead of **camera** in all subsequent examples:
+```
+> cv-cat --file some-video.mp4 "view;null"
+```
 # basic input/output and image filters
 
 If you don't specify **null** the images **cv-cat** reads from your camera will be output to stdout in a simple binary format (see **image data format** section below). Try:
@@ -48,7 +52,11 @@ Now, let's play back **images.bin** in real time:
 ```
 cat images.bin | csv-play --binary t,3ui,s[921600] | cv-cat "timestamp;view;null"
 ```
-## image data format details
+## binary image format
+**snark** uses a custom image format. However, don't be disturbed by that for several reasons:
+- **snark** image format is **very** simple and compatible with other image and non-image data representations
+- **snark** image format is **optional**
+- there are easy ways to convert **snark** image format from/to common image, video, and data formats
 ...
 
 # potentially unmaintained documentation at other repository fork: