Update README with warning on ffprobe+streams

gabriel-nsiqueira · Apr 30, 2016 · e1b2651 · e1b2651
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commit e1b2651
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diff --git a/README.md b/README.md
@@ -1136,6 +1136,8 @@ ffmpeg('/path/to/file1.avi')
   });
 ```
 
+**Warning:** ffprobe may be called with an input stream, but in this case *it will consume data from the stream*, and this data will no longer be available for ffmpeg.  Using both ffprobe and a transcoding command on the same input stream will most likely fail unless the stream is a live stream.  Only do this if you know what you're doing.
+
 The returned object is the same that is returned by running the following command from your shell (depending on your ffmpeg version you may have to replace `-of` with `-print_format`) :
 
 ```sh