shithub: libvpx

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examples/twopass_encoder: Use good quality.

This speeds up the encode significantly. Also added a comment about using
best quality to keep new developers informed.

Change-Id: I04e8154d4b2c4cae07fe7cc9a71e707f649e9ed4

--- a/examples/twopass_encoder.c

+++ b/examples/twopass_encoder.c

@@ -28,10 +28,9 @@

 // Encoding A Frame

 // ----------------

 // Encoding a frame in two pass mode is identical to the simple encoder

-// example, except the deadline is set to VPX_DL_BEST_QUALITY to get the

-// best quality possible. VPX_DL_GOOD_QUALITY could also be used.

+// example. To increase the quality while sacrificing encoding speed,

+// VPX_DL_BEST_QUALITY can be used in place of VPX_DL_GOOD_QUALITY.

 //

-//

 // Processing Statistics Packets

 // -----------------------------

 // Each packet of type `VPX_CODEC_CX_FRAME_PKT` contains the encoded data

@@ -141,13 +140,13 @@

   // Calculate frame statistics.

   while (vpx_img_read(raw, infile)) {

     ++frame_count;

-    get_frame_stats(&codec, raw, frame_count, 1, 0, VPX_DL_BEST_QUALITY,

+    get_frame_stats(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY,

                     &stats);

   }

   // Flush encoder.

   while (get_frame_stats(&codec, NULL, frame_count, 1, 0,

-                         VPX_DL_BEST_QUALITY, &stats)) {}

+                         VPX_DL_GOOD_QUALITY, &stats)) {}

   printf("Pass 0 complete. Processed %d frames.\n", frame_count);

   if (vpx_codec_destroy(&codec))

@@ -181,11 +180,11 @@

   // Encode frames.

   while (vpx_img_read(raw, infile)) {

     ++frame_count;

-    encode_frame(&codec, raw, frame_count, 1, 0, VPX_DL_BEST_QUALITY, writer);

+    encode_frame(&codec, raw, frame_count, 1, 0, VPX_DL_GOOD_QUALITY, writer);

   }

   // Flush encoder.

-  while (encode_frame(&codec, NULL, -1, 1, 0, VPX_DL_BEST_QUALITY, writer)) {}

+  while (encode_frame(&codec, NULL, -1, 1, 0, VPX_DL_GOOD_QUALITY, writer)) {}

   printf("\n");