This patch was based originally on:
https://savannah.gnu.org/patch/index.php?7742

Comments from submitter:

Submitter:  Park Hyunwoo <lqez> 
Submitted:  Mon 12 Mar 2012 06:10:42 AM UTC

Mon 12 Mar 2012 06:10:42 AM UTC, original submission:  
Hi hackers.
I'm using  gnash to make 'movie' file from SWF.

At first, I dumped SWF files with 'dump-gnash -D' options.  But I cou-
ldn't  get  best quality  movie  with  that  option - it only supports
'interval/delay', so I can't get  each of exact frame of SWF.  Default
dump-gnash delay is 10ms - 100fps,  but my SWFs are 30fps and we can't
use  float value(16.66667ms)  as interval.  And also,  The result from
converting 100fps into  30fps via ffmpeg was not good. So I decided to
use 'screenshot' feature to make a movie.

[This] is a patch for adding 'dump all screenshot' using:
--screenshot all

I wanted to add a help message on '-h' option, I can't find a good lo-
cation for it.  There is no help message for  'last' option  that cur-
rently supported, neither.

Thanks.

--- gnash-patches-git-29748750e.old/gui/Player.cpp
+++ gnash-patches-git-29748750e/gui/Player.cpp
@@ -638,10 +638,12 @@
         std::istringstream is(_screenshots);
         std::string arg;
         bool last = false;
+        bool all = false;
         ScreenShotter::FrameList v;
 
         while (std::getline(is, arg, ',')) {
             if (arg == "last") last = true;
+            else if (arg == "all") all = true;
             else try {
                 const size_t frame = boost::lexical_cast<size_t>(arg);
                 v.push_back(frame);
@@ -657,11 +659,12 @@
                 url.path().substr(p + 1);
             _screenshotFile = "screenshot-" + name + "-%f";
         }
-        if (!last && v.empty()) return;
+        if (!all && !last && v.empty()) return;
         
         std::unique_ptr<ScreenShotter> ss(new ScreenShotter(_screenshotFile,
                                                           _screenshotQuality));
-        if (last) ss->lastFrame();
+        if (last) ss->lastFrame(); else if (all) ss->allFrames();
+
         ss->setFrames(v);
         _gui->setScreenShotter(std::move(ss));
     }
--- gnash-patches-git-29748750e.old/gui/ScreenShotter.cpp
+++ gnash-patches-git-29748750e/gui/ScreenShotter.cpp
@@ -63,6 +63,8 @@
     _immediate(false),
     _fileName(fileName),
     _last(false),
+    _all(false),
+    _last_saved_frame(-1),
     _type(typeFromFileName(fileName)),
     _quality(quality)
 {
--- gnash-patches-git-29748750e.old/gui/ScreenShotter.h
+++ gnash-patches-git-29748750e/gui/ScreenShotter.h
@@ -24,6 +24,9 @@
 #include <set>
 #include <algorithm>
 
+#include <boost/lexical_cast.hpp>
+#include <boost/format.hpp>
+
 #include "GnashEnums.h"
 
 namespace gnash {
@@ -57,6 +60,11 @@
         _last = true;
     }
 
+    /// Take whole screenshots
+    void allFrames() {
+        _all = true;
+    }
+
     struct NoAction { void operator()() const {} };
 
     /// To be called on the last frame before exit.
@@ -115,7 +123,16 @@
     void screenShot(const Renderer& r, size_t frameAdvance, Action* t = 0) {
         // Save an image if a spontaneous screenshot was requested or the
         // frame is in the list of requested frames.
-        if (_immediate || std::binary_search(_frames.begin(), _frames.end(),
+        if ( _all ) {
+        	if( frameAdvance != _last_saved_frame )
+        	{
+				if (t) (*t)();
+				std::string frame = boost::str( boost::format("%06d") % frameAdvance);
+				saveImage(r, frame);
+				// printf("screenShot-all : %s\n", frame.c_str());
+				_last_saved_frame = frameAdvance;
+			}
+        } else if (_immediate || std::binary_search(_frames.begin(), _frames.end(),
                     frameAdvance)) {
 
             // Check whether we've rendered an image for this frame.
@@ -148,6 +165,10 @@
     /// Whether to take a screenshot on the last frame.
     bool _last;
 
+    /// Whether to take screenshots on each frame..
+    bool _all;
+    size_t _last_saved_frame;
+
     FrameList _frames;
 
     const FileType _type;