gnash ffmpeg 4.0 patch

diff --git a/libmedia/ffmpeg/MediaHandlerFfmpeg.cpp b/libmedia/ffmpeg/MediaHandlerFfmpeg.cpp
index 127aaaa08..216d96b1f 100644
--- a/libmedia/ffmpeg/MediaHandlerFfmpeg.cpp
+++ b/libmedia/ffmpeg/MediaHandlerFfmpeg.cpp
@@ -149,7 +149,7 @@ MediaHandlerFfmpeg::cameraNames(std::vector<std::string>& /*names*/) const
 size_t
 MediaHandlerFfmpeg::getInputPaddingSize() const
 {
-    return FF_INPUT_BUFFER_PADDING_SIZE;
+    return AV_INPUT_BUFFER_PADDING_SIZE;
 }

 } // gnash.media.ffmpeg namespace
diff --git a/libmedia/ffmpeg/MediaParserFfmpeg.cpp b/libmedia/ffmpeg/MediaParserFfmpeg.cpp
index 9ceb8b022..a27ca56c7 100644
--- a/libmedia/ffmpeg/MediaParserFfmpeg.cpp
+++ b/libmedia/ffmpeg/MediaParserFfmpeg.cpp
@@ -64,7 +64,7 @@ AVInputFormat*
 MediaParserFfmpeg::probeStream()
 {
     const size_t probeSize = 4096;
-    const size_t bufSize = probeSize + FF_INPUT_BUFFER_PADDING_SIZE;
+    const size_t bufSize = probeSize + AV_INPUT_BUFFER_PADDING_SIZE;

        std::unique_ptr<std::uint8_t[]> buffer(new std::uint8_t[bufSize]);

@@ -173,7 +173,7 @@ MediaParserFfmpeg::parseVideoFrame(AVPacket& packet)

        // TODO: We might avoid the copy as a whole by making EncodedVideoFrame
        //       virtual.
-       size_t allocSize = packet.size + FF_INPUT_BUFFER_PADDING_SIZE;
+       size_t allocSize = packet.size + AV_INPUT_BUFFER_PADDING_SIZE;
        std::uint8_t* data = new std::uint8_t[allocSize];
        std::copy(packet.data, packet.data+packet.size, data);
        std::unique_ptr<EncodedVideoFrame> frame(new EncodedVideoFrame(data, packet.size, 0, timestamp));
@@ -221,7 +221,7 @@ MediaParserFfmpeg::parseAudioFrame(AVPacket& packet)

        // TODO: We might avoid the copy as a whole by making EncodedAudioFrame
        //       virtual.
-       size_t allocSize = packet.size + FF_INPUT_BUFFER_PADDING_SIZE;
+       size_t allocSize = packet.size + AV_INPUT_BUFFER_PADDING_SIZE;
        std::uint8_t* data = new std::uint8_t[allocSize];
        std::copy(packet.data, packet.data+packet.size, data);