In the mov muxer (in mov_write_video_tag()), bits_per_coded_sample will
be written under certain conditions and is required to be 32 for the
transparency to be honored in QuickTime.
prores_kostya already has this setting but prores_anatoliy and
prores_videotoolbox didn't.
---
libavcodec/proresenc_anatoliy.c | 3 +++
libavcodec/videotoolboxenc.c | 2 ++
2 files changed, 5 insertions(+)
diff --git a/libavcodec/proresenc_anatoliy.c b/libavcodec/proresenc_anatoliy.c
index a1cb46aa59..16741afd68 100644
--- a/libavcodec/proresenc_anatoliy.c
+++ b/libavcodec/proresenc_anatoliy.c
@@ -930,6 +930,9 @@ static av_cold int prores_encode_init(AVCodecContext *avctx)
}
}
+ if (ctx->need_alpha)
+ avctx->bits_per_coded_sample = 32;
+
ff_fdctdsp_init(&ctx->fdsp, avctx);
avctx->codec_tag = AV_RL32((const uint8_t*)profiles[avctx->profile].name);
diff --git a/libavcodec/videotoolboxenc.c b/libavcodec/videotoolboxenc.c
index 15e0e1fe29..644fd60b00 100644
--- a/libavcodec/videotoolboxenc.c
+++ b/libavcodec/videotoolboxenc.c
@@ -521,6 +521,8 @@ static CMVideoCodecType get_cm_codec_type(AVCodecContext
*avctx,
}
return kCMVideoCodecType_HEVC;
case AV_CODEC_ID_PRORES:
+ if (desc && (desc->flags & AV_PIX_FMT_FLAG_ALPHA))
+ avctx->bits_per_coded_sample = 32;
switch (profile) {
case AV_PROFILE_PRORES_PROXY:
return MKBETAG('a','p','c','o'); //
kCMVideoCodecType_AppleProRes422Proxy
--
2.43.0
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