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-rw-r--r--dom/media/fmp4/MP4Demuxer.cpp9
1 files changed, 7 insertions, 2 deletions
diff --git a/dom/media/fmp4/MP4Demuxer.cpp b/dom/media/fmp4/MP4Demuxer.cpp
index 70b176699..646897468 100644
--- a/dom/media/fmp4/MP4Demuxer.cpp
+++ b/dom/media/fmp4/MP4Demuxer.cpp
@@ -349,8 +349,13 @@ MP4TrackDemuxer::GetNextSample()
if (sample->mCrypto.mValid) {
nsAutoPtr<MediaRawDataWriter> writer(sample->CreateWriter());
writer->mCrypto.mMode = mInfo->mCrypto.mMode;
- writer->mCrypto.mIVSize = mInfo->mCrypto.mIVSize;
- writer->mCrypto.mKeyId.AppendElements(mInfo->mCrypto.mKeyId);
+
+ // Only use the default key parsed from the moov if we haven't already got
+ // one from the sample group description.
+ if (writer->mCrypto.mKeyId.Length() == 0) {
+ writer->mCrypto.mIVSize = mInfo->mCrypto.mIVSize;
+ writer->mCrypto.mKeyId.AppendElements(mInfo->mCrypto.mKeyId);
+ }
}
return sample.forget();
}