diff --git a/SOURCES/ffmpeg-5.1.4.tar.xz.asc b/SOURCES/ffmpeg-5.1.4.tar.xz.asc
new file mode 100644
index 0000000..f033aa5
--- /dev/null
+++ b/SOURCES/ffmpeg-5.1.4.tar.xz.asc
@@ -0,0 +1,11 @@
+-----BEGIN PGP SIGNATURE-----
+
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diff --git a/SOURCES/ffmpeg-chromium.patch b/SOURCES/ffmpeg-chromium.patch
new file mode 100644
index 0000000..6625e2d
--- /dev/null
+++ b/SOURCES/ffmpeg-chromium.patch
@@ -0,0 +1,46 @@
+From 4464ecf750bb9440e2571a8d810627cdec85ae02 Mon Sep 17 00:00:00 2001
+From: Frank Liberato <liberato@chromium.org>
+Date: Wed, 7 Jul 2021 19:01:22 -0700
+Subject: [PATCH] Add av_stream_get_first_dts for Chromium
+
+---
+ libavformat/avformat.h | 4 ++++
+ libavformat/utils.c    | 7 +++++++
+ 2 files changed, 11 insertions(+)
+
+diff --git a/libavformat/avformat.h b/libavformat/avformat.h
+index f12fa7d904..0b9fd1f061 100644
+--- a/libavformat/avformat.h
++++ b/libavformat/avformat.h
+@@ -1128,6 +1128,10 @@ struct AVCodecParserContext *av_stream_get_parser(const AVStream *s);
+  */
+ int64_t    av_stream_get_end_pts(const AVStream *st);
+ 
++// Chromium: We use the internal field first_dts vvv
++int64_t    av_stream_get_first_dts(const AVStream *st);
++// Chromium: We use the internal field first_dts ^^^
++
+ #define AV_PROGRAM_RUNNING 1
+ 
+ /**
+diff --git a/libavformat/utils.c b/libavformat/utils.c
+index cf4d68bff9..7d750abf88 100644
+--- a/libavformat/utils.c
++++ b/libavformat/utils.c
+@@ -55,6 +55,13 @@ int ff_unlock_avformat(void)
+     return ff_mutex_unlock(&avformat_mutex) ? -1 : 0;
+ }
+ 
++// Chromium: We use the internal field first_dts vvv
++int64_t av_stream_get_first_dts(const AVStream *st)
++{
++  return cffstream(st)->first_dts;
++}
++// Chromium: We use the internal field first_dts ^^^
++
+ /* an arbitrarily chosen "sane" max packet size -- 50M */
+ #define SANE_CHUNK_SIZE (50000000)
+ 
+-- 
+2.41.0
+