ffmpeg: add patch for chromium

extra/ffmpeg/build

@@ -1,5 +1,7 @@
 #!/bin/sh -e
 
+patch -p1 < add-av_stream_get_first_dts-for-chromium.patch
+
 ./configure \
     --cc="$CC" \
     --cxx="$CXX" \

extra/ffmpeg/checksums

@@ -1 +1,2 @@
 51e919f7d205062c0fd4fae6243a84850391115104ccf1efc451733bc0ac7298
+29ce1c530fbbd0d2a258da0da2b49087b99ca039574a588b3fd5349bc769e01e

extra/ffmpeg/patches/add-av_stream_get_first_dts-for-chromium.patch

@@ -0,0 +1,33 @@
+diff --git a/libavformat/avformat.h b/libavformat/avformat.h
+index 6ce367e..cba3f5e 100644
+--- a/libavformat/avformat.h
++++ b/libavformat/avformat.h
+@@ -1115,6 +1115,10 @@ 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 e643821..50ba6af 100644
+--- a/libavformat/utils.c
++++ b/libavformat/utils.c
+@@ -92,6 +92,13 @@ int64_t av_stream_get_end_pts(const AVStream *st)
+         return AV_NOPTS_VALUE;
+ }
+ 
++// 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 ^^^
++
+ struct AVCodecParserContext *av_stream_get_parser(const AVStream *st)
+ {
+     return cffstream(st)->parser;

extra/ffmpeg/sources

@@ -1 +1,2 @@
 https://ffmpeg.org/releases/ffmpeg-VERSION.tar.xz
+patches/add-av_stream_get_first_dts-for-chromium.patch

extra/ffmpeg/version

@@ -1 +1 @@
-5.0 1
+5.0 2