Explain usage of image formats other than GIF.

patch by Victor Paesa, wzrlpy *at* arsystel com

Originally committed as revision 5824 to svn://svn.ffmpeg.org/ffmpeg/trunk

doc/faq.texi

@@ -30,6 +30,33 @@ If the JPEGs are named img1.jpg, img2.jpg, img3.jpg,..., use:
 
 The same system is used for the other image formats.
 
+@section Only GIF is listed by -format. Is that the only accepted image format?
+
+No, there are more; they are listed among the video codecs:
+  jpeg, png, ppm, pbm, pam, pgm.
+
+For example:
+@example
+  ffmpeg -f image2 -i menu.png -f image2 menu.jpg
+@end example
+
+The @file{menu.png} used as input will be converted to @file{menu.jpg}.
+
+Instead of relying on file format self-recognition, you may also use
+@table @option
+@item -vcodec ppm
+@item -vcodec png
+@item -vcodec mjpeg
+@end table
+to force the encoding.
+
+Applying that to the previous example:
+@example
+  ffmpeg -f image2 -vcodec png -i menu.png -f image2 -vcodec mjpeg menu.jpg
+@end example
+
+Beware that there is no "jpeg" codec. Use "mjpeg" instead.
+
 @section FFmpeg does not support codec XXX. Can you include a Windows DLL loader to support it ?
 
 No. FFmpeg only supports open source codecs. Windows DLLs are not