diff --git a/scripts/download_testfiles.sh b/scripts/download_testfiles.sh
index ee38a98..a9b9151 100755
--- a/scripts/download_testfiles.sh
+++ b/scripts/download_testfiles.sh
@@ -116,6 +116,7 @@ convert() {
 convert flac/test.flac ffmpeg -i mtx-test-data/alac/othertest-itunes.m4a -c:a flac flac/test.flac
 convert flac/test.ogg ffmpeg -i flac/test.flac -vn -c:a copy flac/test.ogg
 convert mkv/av1_test.mkv ffmpeg -i matroska_wave1/test1.mkv -t 1 -c:v libaom-av1 -crf 30 -cpu-used 5 -an -strict experimental mkv/av1_test.mkv
+convert mp4/av1_test.mp4 ffmpeg -i mkv/av1_test.mkv -c copy mp4/av1_test.mp4
 convert misc/av1.ivf ffmpeg -i mkv/av1_test.mkv -c copy misc/av1.ivf
 convert mkv/nested-tags.mkv \
         mkvmerge --ui-language en_US \