Changeset 25890

Timestamp:

2012-06-29T17:10:00+12:00 (11 years ago)

Author:

jmt12

Message:

Moving -ss option before input video in FFMPEG commands as it is significantly faster

File:

• gs2-extensions/video-and-audio/trunk/src/perllib/plugins/VideoConverter.pm (modified) (1 diff)

gs2-extensions/video-and-audio/trunk/src/perllib/plugins/VideoConverter.pm

@@ -1020 +1020 @@
     #   $vcodec ,$fps ,$atype ,$afreq ,$achan ,$arate) = identify($ivideo_filename_gsdlenv,$outhandle,0);
     
-    #print STDERR "***** grabbing keyframe as 50% of $video_duration\n";
+    print STDERR "***** grabbing keyframe as 50% of $video_duration\n";
     my $ss_opt = ($video_duration / 1000.0) * 0.45;
-    #print STDERR "*** ssopt = $ss_opt\n";
-    
-    $command = "ffmpeg  -ss $ss_opt -i \"$ivideo_filename_gsdlenv\" -ss 4.5 -an -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
-    #$command = "ffmpeg -ss 4.5 -i \"$ivideo_filename_gsdlenv\" -ss 4.5 -an -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
+    print STDERR "*** ssopt = $ss_opt\n";
+    
+##  $command = "ffmpeg  -ss $ss_opt -i \"$ivideo_filename_gsdlenv\" -ss 4.5 -an -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
+##  $command = "ffmpeg -ss 4.5 -i \"$ivideo_filename_gsdlenv\" -ss 4.5 -an -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
 
 ##  $command = "ffmpeg -i \"$ivideo_filename_gsdlenv\"  -ss 10.5 -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
 
-    $command = "ffmpeg -i \"$ivideo_filename_gsdlenv\"  -ss 16.5 -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";
+        # *NOTE* "-ss X" should occur before "-i" if you want to seek in the
+        # input file (hence making generation significantly faster). [jmt12]
+    $command = "ffmpeg -ss 16.5 -i \"$ivideo_filename_gsdlenv\" -vframes 1 -f image2 -s ${thumbnailwidth}x${thumbnailheight} -deinterlace -y \"$thumbnailfile_gsdlenv\"";