Here the packet size is known before allocating the packet because
the encoder provides said information (and works with internal buffers
itself), so one can pass this information to ff_alloc_packet2() to
avoid the implicit use of another intermediate buffer for the packet data.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
 libavcodec/libx264.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 4ddc4973a4..b23471a809 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -144,7 +144,7 @@ static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
     for (i = 0; i < nnal; i++)
         size += nals[i].i_payload;
 
-    if ((ret = ff_alloc_packet2(ctx, pkt, size, 0)) < 0)
+    if ((ret = ff_alloc_packet2(ctx, pkt, size, size)) < 0)
         return ret;
 
     p = pkt->data;
-- 
2.27.0

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