--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
@@ -12,16 +12,17 @@
 #include "VPXDecoder.h"
 #include "mozilla/layers/KnowsCompositor.h"
 
 #include "libavutil/pixfmt.h"
 #if LIBAVCODEC_VERSION_MAJOR < 54
 #define AVPixelFormat PixelFormat
 #define AV_PIX_FMT_YUV420P PIX_FMT_YUV420P
 #define AV_PIX_FMT_YUVJ420P PIX_FMT_YUVJ420P
+#define AV_PIX_FMT_YUV422P PIX_FMT_YUV422P
 #define AV_PIX_FMT_YUV444P PIX_FMT_YUV444P
 #define AV_PIX_FMT_NONE PIX_FMT_NONE
 #endif
 #include "mozilla/PodOperations.h"
 #include "mozilla/TaskQueue.h"
 #include "nsThreadUtils.h"
 #include "prsystem.h"
 
@@ -43,16 +44,19 @@ static AVPixelFormat
 ChoosePixelFormat(AVCodecContext* aCodecContext, const AVPixelFormat* aFormats)
 {
   FFMPEG_LOG("Choosing FFmpeg pixel format for video decoding.");
   for (; *aFormats > -1; aFormats++) {
     switch (*aFormats) {
       case AV_PIX_FMT_YUV444P:
         FFMPEG_LOG("Requesting pixel format YUV444P.");
         return AV_PIX_FMT_YUV444P;
+      case AV_PIX_FMT_YUV422P:
+        FFMPEG_LOG("Requesting pixel format YUV422P.");
+        return AV_PIX_FMT_YUV422P;
       case AV_PIX_FMT_YUV420P:
         FFMPEG_LOG("Requesting pixel format YUV420P.");
         return AV_PIX_FMT_YUV420P;
       case AV_PIX_FMT_YUVJ420P:
         FFMPEG_LOG("Requesting pixel format YUVJ420P.");
         return AV_PIX_FMT_YUVJ420P;
       default:
         break;
@@ -315,16 +319,19 @@ FFmpegVideoDecoder<LIBAV_VER>::DoDecode(
   b.mPlanes[1].mOffset = b.mPlanes[1].mSkip = 0;
   b.mPlanes[2].mOffset = b.mPlanes[2].mSkip = 0;
 
   b.mPlanes[0].mWidth = mFrame->width;
   b.mPlanes[0].mHeight = mFrame->height;
   if (mCodecContext->pix_fmt == AV_PIX_FMT_YUV444P) {
     b.mPlanes[1].mWidth = b.mPlanes[2].mWidth = mFrame->width;
     b.mPlanes[1].mHeight = b.mPlanes[2].mHeight = mFrame->height;
+  } else if (mCodecContext->pix_fmt == AV_PIX_FMT_YUV422P) {
+    b.mPlanes[1].mWidth = b.mPlanes[2].mWidth = (mFrame->width + 1) >> 1;
+    b.mPlanes[1].mHeight = b.mPlanes[2].mHeight = mFrame->height;
   } else {
     b.mPlanes[1].mWidth = b.mPlanes[2].mWidth = (mFrame->width + 1) >> 1;
     b.mPlanes[1].mHeight = b.mPlanes[2].mHeight = (mFrame->height + 1) >> 1;
   }
   if (mLib->av_frame_get_colorspace) {
     switch (mLib->av_frame_get_colorspace(mFrame)) {
       case AVCOL_SPC_BT709:
         b.mYUVColorSpace = YUVColorSpace::BT709;