On 25/09/2020 15:43, James Almer wrote:
Signed-off-by: James Almer <jamr...@gmail.com>
---
  libavcodec/av1dec.c | 10 ++++++++++
  1 file changed, 10 insertions(+)

diff --git a/libavcodec/av1dec.c b/libavcodec/av1dec.c
index 0bb04a3e44..f6b9fbbac3 100644
--- a/libavcodec/av1dec.c
+++ b/libavcodec/av1dec.c
@@ -405,6 +405,9 @@ static av_cold int av1_decode_free(AVCodecContext *avctx)
  static int set_context_with_sequence(AVCodecContext *avctx,
                                       const AV1RawSequenceHeader *seq)
  {
+    int width = seq->max_frame_width_minus_1 + 1;
+    int height = seq->max_frame_height_minus_1 + 1;
+
      avctx->profile = seq->seq_profile;
      avctx->level = seq->seq_level_idx[0];
@@ -423,6 +426,13 @@ static int set_context_with_sequence(AVCodecContext *avctx,
          break;
      }
+ if (avctx->width != width || avctx->height != height) {
+        int ret = ff_set_dimensions(avctx, width, height);
+        if (ret < 0)
+            return ret;
+    }
+    avctx->sample_aspect_ratio = (AVRational) { 1, 1 };
+
      if (seq->timing_info.num_units_in_display_tick &&
          seq->timing_info.time_scale) {
          av_reduce(&avctx->framerate.den, &avctx->framerate.num,


Can you explain more about why this might be wanted?  There is no requirement 
that the stream actually contains any frames with the size stated in the 
sequence header.

- Mark
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