The bundled ffmpeg in Chromium is newer than the one in Guix.  Patch so
we can build with the new and old ffmpeg versions.

Taken from Gentoo:
https://gitweb.gentoo.org/repo/gentoo.git/tree/www-client/chromium/files/chromium-93-fix-build-with-system-ffmpeg.patch

diff --git a/media/filters/audio_decoder_unittest.cc b/media/filters/audio_decoder_unittest.cc
--- a/media/filters/audio_decoder_unittest.cc
+++ b/media/filters/audio_decoder_unittest.cc
@@ -109,7 +109,11 @@ void SetDiscardPadding(AVPacket* packet,
   }
 
   // If the timestamp is positive, try to use FFmpeg's discard data.
+#if LIBAVUTIL_VERSION_MAJOR < 57
+  int skip_samples_size = 0;
+#else
   size_t skip_samples_size = 0;
+#endif
   const uint32_t* skip_samples_ptr =
       reinterpret_cast<const uint32_t*>(av_packet_get_side_data(
           packet, AV_PKT_DATA_SKIP_SAMPLES, &skip_samples_size));
diff --git a/media/filters/ffmpeg_demuxer.cc b/media/filters/ffmpeg_demuxer.cc
--- a/media/filters/ffmpeg_demuxer.cc
+++ b/media/filters/ffmpeg_demuxer.cc
@@ -427,11 +427,19 @@ void FFmpegDemuxerStream::EnqueuePacket(
   scoped_refptr<DecoderBuffer> buffer;
 
   if (type() == DemuxerStream::TEXT) {
+#if LIBAVUTIL_VERSION_MAJOR < 57
+    int id_size = 0;
+#else
     size_t id_size = 0;
+#endif
     uint8_t* id_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_WEBVTT_IDENTIFIER, &id_size);
 
+#if LIBAVUTIL_VERSION_MAJOR < 57
+    int settings_size = 0;
+#else
     size_t settings_size = 0;
+#endif
     uint8_t* settings_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_WEBVTT_SETTINGS, &settings_size);
 
@@ -443,7 +451,11 @@ void FFmpegDemuxerStream::EnqueuePacket(
     buffer = DecoderBuffer::CopyFrom(packet->data, packet->size,
                                      side_data.data(), side_data.size());
   } else {
+#if LIBAVUTIL_VERSION_MAJOR < 57
+    int side_data_size = 0;
+#else
     size_t side_data_size = 0;
+#endif
     uint8_t* side_data = av_packet_get_side_data(
         packet.get(), AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, &side_data_size);
 
@@ -504,7 +516,11 @@ void FFmpegDemuxerStream::EnqueuePacket(
                                        packet->size - data_offset);
     }
 
+#if LIBAVUTIL_VERSION_MAJOR < 57
+    int skip_samples_size = 0;
+#else
     size_t skip_samples_size = 0;
+#endif
     const uint32_t* skip_samples_ptr =
         reinterpret_cast<const uint32_t*>(av_packet_get_side_data(
             packet.get(), AV_PKT_DATA_SKIP_SAMPLES, &skip_samples_size));
-display.patch?id=ab9f9b582e510e3d1133ec29242e70fca1d2997a'>slim-display.patch</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/patches/slim-display.patch?id=ab9f9b582e510e3d1133ec29242e70fca1d2997a&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-12-23 11:17:49 +0100'>2023-12-23</span></td><td><a href='/guix/commit/gnu/packages/patches/slim-display.patch?id=2c8cdb05502cacaf603da231796ccafa59671117'>gnu: slim: Update to 1.4.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/display-managers.scm (slim)[version]: Update to 1.4.0.
[inputs]: Remove input label.
[arguments]: Use gexp and remove fix-0-pointer-comparison.
[home-pages]: Update to slim-fork's url.

* gnu/packages/patches/slim-config.patch: Port to slim-1.4.0.
* gnu/packages/patches/slim-display.patch: Port to slim-1.4.0.
* gnu/packages/patches/slim-reset.patch: Deleted, no ablilty to port this
patch for big change in v1.4.0.
* gnu/packages/patches/slim-session.patch: Deleted. seem to work without this
patch, further observation is needed.
* gnu/packages/patches/slim-sigusr1.patch: Deleted, fixed in upstream.

* gnu/local.mk: Remove slim-reset.patch, slim-session.patch, slim-sigur1.patch.

Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Feng Shu</td></tr>