From 0a51c7d42a519c63178a4f3e35b8967f21da3a6a Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Wed, 22 Apr 2015 20:50:10 +0200
Subject: [PATCH] prores: Set the bits_per_coded_sample for alpha pix_fmt

Improve the compatibility with other software.
---
 libavcodec/proresenc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/proresenc.c b/libavcodec/proresenc.c
index f61aa60a20..3a5524aa4c 100644
--- a/libavcodec/proresenc.c
+++ b/libavcodec/proresenc.c
@@ -1151,6 +1151,7 @@ static av_cold int encode_init(AVCodecContext *avctx)
             av_log(avctx, AV_LOG_ERROR, "alpha bits should be 0, 8 or 16\n");
             return AVERROR(EINVAL);
         }
+        avctx->bits_per_coded_sample = 32;
     } else {
         ctx->alpha_bits = 0;
     }