Fix MIME type for divx in Matroska

Issue: #3863
PiperOrigin-RevId: 234453728

library/core/src/main/java/com/google/android/exoplayer2/extractor/mkv/MatroskaExtractor.java

@@ -2070,7 +2070,7 @@ public class MatroskaExtractor implements Extractor {
         buffer.skipBytes(16); // size(4), width(4), height(4), planes(2), bitcount(2).
         buffer.skipBytes(16); // size(4), width(4), height(4), planes(2), bitcount(2).
         long compression = buffer.readLittleEndianUnsignedInt();
         long compression = buffer.readLittleEndianUnsignedInt();
         if (compression == FOURCC_COMPRESSION_DIVX) {
         if (compression == FOURCC_COMPRESSION_DIVX) {
-          return new Pair<>(MimeTypes.VIDEO_H263, null);
+          return new Pair<>(MimeTypes.VIDEO_DIVX, null);
         } else if (compression == FOURCC_COMPRESSION_VC1) {
         } else if (compression == FOURCC_COMPRESSION_VC1) {
           // Search for the initialization data from the end of the BITMAPINFOHEADER. The last 20
           // Search for the initialization data from the end of the BITMAPINFOHEADER. The last 20
           // bytes of which are: sizeImage(4), xPel/m (4), yPel/m (4), clrUsed(4), clrImportant(4).
           // bytes of which are: sizeImage(4), xPel/m (4), yPel/m (4), clrUsed(4), clrImportant(4).

library/core/src/main/java/com/google/android/exoplayer2/util/MimeTypes.java

@@ -41,6 +41,7 @@ public final class MimeTypes {
   public static final String VIDEO_MPEG = BASE_TYPE_VIDEO + "/mpeg";
   public static final String VIDEO_MPEG = BASE_TYPE_VIDEO + "/mpeg";
   public static final String VIDEO_MPEG2 = BASE_TYPE_VIDEO + "/mpeg2";
   public static final String VIDEO_MPEG2 = BASE_TYPE_VIDEO + "/mpeg2";
   public static final String VIDEO_VC1 = BASE_TYPE_VIDEO + "/wvc1";
   public static final String VIDEO_VC1 = BASE_TYPE_VIDEO + "/wvc1";
+  public static final String VIDEO_DIVX = BASE_TYPE_VIDEO + "/divx";
   public static final String VIDEO_DOLBY_VISION = BASE_TYPE_VIDEO + "/dolby-vision";
   public static final String VIDEO_DOLBY_VISION = BASE_TYPE_VIDEO + "/dolby-vision";
   public static final String VIDEO_UNKNOWN = BASE_TYPE_VIDEO + "/x-unknown";
   public static final String VIDEO_UNKNOWN = BASE_TYPE_VIDEO + "/x-unknown";