FFmpeg M94 roll.

Contains DEPS update + chromium-side fixes.

Bug: 1227259
Change-Id: I61c5eaa789ea12c17d0cbcbf837435b9cf32479b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3011889
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Frank Liberato <liberato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#909174}

DEPS

@@ -1037,7 +1037,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/google/farmhash.git' + '@' + '816a4ae622e964763ca0862d9dbd19324a1eaf45',
 
   'src/third_party/ffmpeg':
-    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '14e1145ddd3d5f3ba478a19b4ae8822679d83a6c',
+    Var('chromium_git') + '/chromium/third_party/ffmpeg.git' + '@' + '1f33e234be4e2823c663d02b3baa3e7a7cfc33cb',
 
   'src/third_party/flac':
     Var('chromium_git') + '/chromium/deps/flac.git' + '@' + 'af862024c8c8fa0ae07ced05e89013d881b00596',

media/ffmpeg/ffmpeg_common.h

@@ -29,6 +29,7 @@ extern "C" {
 #include <libavformat/avformat.h>
 #include <libavformat/avio.h>
 #include <libavutil/avutil.h>
+#include <libavutil/channel_layout.h>
 #include <libavutil/imgutils.h>
 #include <libavutil/log.h>
 #include <libavutil/mastering_display_metadata.h>

media/filters/ffmpeg_demuxer.cc

@@ -106,12 +106,12 @@ static base::TimeDelta ExtractStartTime(AVStream* stream) {
 
   // Next try to use the first DTS value, for codecs where we know PTS == DTS
   // (excludes all H26x codecs). The start time must be returned in PTS.
-  if (stream->first_dts != kNoFFmpegTimestamp &&
+  if (av_stream_get_first_dts(stream) != kNoFFmpegTimestamp &&
       stream->codecpar->codec_id != AV_CODEC_ID_HEVC &&
       stream->codecpar->codec_id != AV_CODEC_ID_H264 &&
       stream->codecpar->codec_id != AV_CODEC_ID_MPEG4) {
     const base::TimeDelta first_pts =
-        ConvertFromTimeBase(stream->time_base, stream->first_dts);
+        ConvertFromTimeBase(stream->time_base, av_stream_get_first_dts(stream));
     if (first_pts < start_time)
       start_time = first_pts;
   }