shithub: libvpx

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vpxdec: Fix webm fps check.

If the webm file did not have a Cues then vpxdec would fail
when creating a y4m file. If there is no Cues element print
out a warning and set fps to 30.

Change-Id: Ieea7040265dfdac7dff4ccf917c6f756160a96bc

--- a/vpxdec.c

+++ b/vpxdec.c

@@ -501,6 +501,15 @@

   unsigned int i;

   uint64_t     tstamp = 0;

+  /* Check to see if we can seek before we parse any data. */

+  if (nestegg_track_seek(input->nestegg_ctx, input->video_track, 0)) {

+    fprintf(stderr,

+            "WARNING: Failed to guess framerate (no Cues), set to 30fps.\n");

+    *fps_num = 30;

+    *fps_den = 1;

+    return 0;

+  }

+

   /* Guess the framerate. Read up to 1 second, or 50 video packets,

    * whichever comes first.

    */