ffplay: improve robustness of opt_codec(), and add options acodec,vcodec,scodec

Fail with a meaningfull error message in case of bogus input.

Also the new options are more consistent with the rest of the tool
options, since it does not support generic stream specifiers.

1 files changed, 14 insertions, 2 deletions

diff --git a/doc/ffplay.texi b/doc/ffplay.texi
index e2bded7dcc..1396b01b42 100644
--- a/doc/ffplay.texi
+++ b/doc/ffplay.texi
@@ -134,8 +134,20 @@ Exit when video is done playing.
 Exit if any key is pressed.
 @item -exitonmousedown
 Exit if any mouse button is pressed.
-@item -codec:@var{stream_type}
-Force a specific decoder implementation
+
+@item -codec:@var{media_specifier} @var{codec_name}
+Force a specific decoder implementation for the stream identified by
+@var{media_specifier}, which can assume the values @code{a} (audio),
+@code{v} (video), and @code{s} subtitle.
+
+@item -acodec @var{codec_name}
+Force a specific audio decoder.
+
+@item -vcodec @var{codec_name}
+Force a specific video decoder.
+
+@item -scodec @var{codec_name}
+Force a specific subtitle decoder.
 @end table
 
 @section While playing