From: Niklas Haas <g...@haasn.dev>
---
fftools/ffmpeg_enc.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fftools/ffmpeg_enc.c b/fftools/ffmpeg_enc.c
index 4568c15073..babfca6c0a 100644
--- a/fftools/ffmpeg_enc.c
+++ b/fftools/ffmpeg_enc.c
@@ -287,6 +287,17 @@ int enc_open(void *opaque, const AVFrame *frame)
av_chroma_location_name(frame->chroma_location));
}
+ if (enc_ctx->alpha_mode == AVALPHA_MODE_UNSPECIFIED) {
+ enc_ctx->alpha_mode = frame->alpha_mode;
+ } else if (enc_ctx->alpha_mode != frame->alpha_mode &&
+ frame->alpha_mode != AVALPHA_MODE_UNSPECIFIED) {
+ av_log(e, AV_LOG_WARNING,
+ "Requested alpha mode '%s' does not match the "
+ "frame tagged alpha mode '%s'; result may be incorrect.\n",
+ av_alpha_mode_name(enc_ctx->alpha_mode),
+ av_alpha_mode_name(frame->alpha_mode));
+ }
+
if (enc_ctx->flags & (AV_CODEC_FLAG_INTERLACED_DCT |
AV_CODEC_FLAG_INTERLACED_ME) ||
(frame->flags & AV_FRAME_FLAG_INTERLACED)
#if FFMPEG_OPT_TOP
--
2.50.1
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