}
}
- if ((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) ||
- (tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) ||
+ if (((tag = av_dict_get(st->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
+ ((tag = av_dict_get( s->metadata, "alpha_mode", NULL, 0)) && atoi(tag->value)) ||
(codec->pix_fmt == AV_PIX_FMT_YUVA420P)) {
put_ebml_uint(pb, MATROSKA_ID_VIDEOALPHAMODE, 1);
}