diff --git a/media/codec2/sfplugin/CCodec.cpp b/media/codec2/sfplugin/CCodec.cpp
index 78ddd6d..31b870e 100644
--- a/media/codec2/sfplugin/CCodec.cpp
+++ b/media/codec2/sfplugin/CCodec.cpp
@@ -1760,15 +1760,18 @@
                         // move all info into output-stream #0 domain
                         updates.emplace_back(C2Param::CopyAsStream(*info, true /* output */, stream));
                     }
-                    for (const C2ConstGraphicBlock &block : buf->data().graphicBlocks()) {
+
+                    const std::vector<C2ConstGraphicBlock> blocks = buf->data().graphicBlocks();
+                    // for now only do the first block
+                    if (!blocks.empty()) {
                         // ALOGV("got output buffer with crop %u,%u+%u,%u and size %u,%u",
                         //      block.crop().left, block.crop().top,
                         //      block.crop().width, block.crop().height,
                         //      block.width(), block.height());
+                        const C2ConstGraphicBlock &block = blocks[0];
                         updates.emplace_back(new C2StreamCropRectInfo::output(stream, block.crop()));
                         updates.emplace_back(new C2StreamPictureSizeInfo::output(
                                 stream, block.crop().width, block.crop().height));
-                        break; // for now only do the first block
                     }
                     ++stream;
                 }
diff --git a/media/extractors/mkv/MatroskaExtractor.cpp b/media/extractors/mkv/MatroskaExtractor.cpp
index 23022e4..2459bf5 100644
--- a/media/extractors/mkv/MatroskaExtractor.cpp
+++ b/media/extractors/mkv/MatroskaExtractor.cpp
@@ -1879,13 +1879,12 @@
 
     for(size_t i = 0; i < track->GetContentEncodingCount(); i++) {
         const mkvparser::ContentEncoding *encoding = track->GetContentEncodingByIndex(i);
-        for(size_t j = 0; j < encoding->GetEncryptionCount(); j++) {
+        if (encoding->GetEncryptionCount() > 0) {
             const mkvparser::ContentEncoding::ContentEncryption *encryption;
-            encryption = encoding->GetEncryptionByIndex(j);
+            encryption = encoding->GetEncryptionByIndex(0);
             AMediaFormat_setBuffer(trackInfo->mMeta,
                     AMEDIAFORMAT_KEY_CRYPTO_KEY, encryption->key_id, encryption->key_id_len);
             trackInfo->mEncrypted = true;
-            break;
         }
 
         for(size_t j = 0; j < encoding->GetCompressionCount(); j++) {