Speed up reverse seeking in the ffmpeg importer by using the ffmpeg -ss option to...

git-svn-id: https://synfig.svn.sourceforge.net/svnroot/synfig@2161 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-core/trunk/src/modules/mod_ffmpeg/mptr_ffmpeg.cpp b/synfig-core/trunk/src/modules/mod_ffmpeg/mptr_ffmpeg.cpp
index b611d97..0ab514f 100644 (file)
--- a/synfig-core/trunk/src/modules/mod_ffmpeg/mptr_ffmpeg.cpp
+++ b/synfig-core/trunk/src/modules/mod_ffmpeg/mptr_ffmpeg.cpp
@@ -102,7 +102,7 @@ ffmpeg_mptr::seek_to(int frame)
 
                string command;
                
-               command=strprintf("ffmpeg -i \"%s\" -an -f image2pipe -vcodec ppm -\n",filename.c_str());
+               command=strprintf("ffmpeg -ss 00:00:00.%d -i \"%s\" -an -f image2pipe -vcodec ppm -\n",frame,filename.c_str());
                
                file=popen(command.c_str(),POPEN_BINARY_READ_TYPE);
 
@@ -133,7 +133,8 @@ ffmpeg_mptr::seek_to(int frame)
                        }
                        // Close the unneeded pipein
                        close(p[1]);
-                       execlp("ffmpeg", "ffmpeg", "-i", filename.c_str(), "-an", "-f", "image2pipe", "-vcodec", "ppm", "-", (const char *)NULL);
+                       string time = strprintf("00:00:00.%d",frame);
+                       execlp("ffmpeg", "ffmpeg", "-ss", time.c_str(), "-i", filename.c_str(), "-an", "-f", "image2pipe", "-vcodec", "ppm", "-", (const char *)NULL);
                        // We should never reach here unless the exec failed
                        cerr<<"Unable to open pipe to ffmpeg"<<endl;
                        _exit(1);