From 4b74c2be1dd6104f3a4dd50d29ece78857ada3fa Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Wed, 29 Apr 2015 08:23:08 +0300
Subject: [PATCH] vp9 codec was slow and produced no keyframes. Trying vp8
 instead.

---
 .../svjatoslav/meviz/encoder/converters/AvconvVideo.java   | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/main/java/eu/svjatoslav/meviz/encoder/converters/AvconvVideo.java b/src/main/java/eu/svjatoslav/meviz/encoder/converters/AvconvVideo.java
index beb634e..ea4d1d3 100644
--- a/src/main/java/eu/svjatoslav/meviz/encoder/converters/AvconvVideo.java
+++ b/src/main/java/eu/svjatoslav/meviz/encoder/converters/AvconvVideo.java
@@ -80,7 +80,7 @@ public class AvconvVideo extends AbstractConverter {
 		String audioCodec = "libmp3lame";
 
 		if (targetFormat.equals("webm")) {
-			videoCodec = "vp9";
+			videoCodec = "vp8";
 			audioCodec = "opus";
 			codecParams.append("-s 800x600 ");
 		}
@@ -98,7 +98,12 @@ public class AvconvVideo extends AbstractConverter {
 			videoBitrate = 1000;
 			audioBitrate = 128;
 			videoCodec = "libxvid";
+
+			// reduce resolution
 			codecParams.append("-s 640x480 ");
+
+			// enforce maximum keyframe interval
+			codecParams.append("-g 150 ");
 		}
 
 		codecParams.append(constructCodecParamsString(options, videoBitrate,
-- 
2.20.1