On 1/24/2022 2:00 PM, Anton Khirnov wrote:
Parsers should not mess with decoder private data. It is also completely
unnecessary here.
---
  libavcodec/h264_parser.c | 8 +++-----
  1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c
index e3a11702c5..816b04845e 100644
--- a/libavcodec/h264_parser.c
+++ b/libavcodec/h264_parser.c
@@ -247,7 +247,6 @@ static inline int parse_nal_units(AVCodecParserContext *s,
                                    const uint8_t * const buf, int buf_size)
  {
      H264ParseContext *p = s->priv_data;
-    H264Context *h = avctx->priv_data;
      H2645RBSP rbsp = { NULL };
      H2645NAL nal = { NULL };
      int buf_index, next_avc;
@@ -553,11 +552,10 @@ static inline int parse_nal_units(AVCodecParserContext *s,
                  p->last_picture_structure = s->picture_structure;
                  p->last_frame_num = p->poc.frame_num;
              }
-            if (h && sps->timing_info_present_flag) {
+            if (sps->timing_info_present_flag) {
                  int64_t den = sps->time_scale;
-                if (p->sei.unregistered.x264_build >= 0)
-                    h->x264_build = p->sei.unregistered.x264_build;
-                if (h->x264_build < 44U)
+                if (p->sei.unregistered.x264_build >= 0 &&

I don't think this check is needed. < 44U should in theory ensure the default of -1 is converted to unsigned and the check will evaluate to false.

See my patch (I don't mind if you amend yours and push this with your authorship).

+                    p->sei.unregistered.x264_build < 44U)
                      den *= 2;
                  av_reduce(&avctx->framerate.den, &avctx->framerate.num,
                            sps->num_units_in_tick * avctx->ticks_per_frame, den, 1 
<< 30);
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