mpegvideo-based encoders supporting bframes implement this
by opening encoders of their own to test how long the chains
of bframes are supposed to be. The needed AVCodec was obtained
via avcodec_find_encoder(). This is complicated, as the current
encoder can be directly obtained. And it also is not guaranteed
that one actually gets the current encoder or not another encoder
for the same codec ID (the latter does not seem to be the case now).

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
 libavcodec/mpegvideo_enc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index 02efc9c2e9..f21febd4db 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1216,7 +1216,6 @@ static int encode_frame(AVCodecContext *c, AVFrame 
*frame, AVPacket *pkt)
 
 static int estimate_best_b_count(MPVMainEncContext *s)
 {
-    const AVCodec *codec = avcodec_find_encoder(s->avctx->codec_id);
     AVPacket *pkt;
     const int scale = s->brd_scale;
     int width  = s->width  >> scale;
@@ -1300,7 +1299,7 @@ static int estimate_best_b_count(MPVMainEncContext *s)
         c->time_base    = s->avctx->time_base;
         c->max_b_frames = s->max_b_frames;
 
-        ret = avcodec_open2(c, codec, NULL);
+        ret = avcodec_open2(c, s->avctx->codec, NULL);
         if (ret < 0)
             goto fail;
 
-- 
2.32.0

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