Some codecs set this in the parser, but not the decoder
---
libavcodec/parser.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/parser.c b/libavcodec/parser.c
index 2c8fc69..30cfc55 100644
--- a/libavcodec/parser.c
+++ b/libavcodec/parser.c
@@ -182,6 +182,11 @@ int av_parser_parse2(AVCodecParserContext *s,
AVCodecContext *avctx,
index = s->parser->parser_parse(s, avctx, (const uint8_t **) poutbuf,
poutbuf_size, buf, buf_size);
av_assert0(index > -0x20000000); // The API does not allow returning
AVERROR codes
+#define FILL(name) if(s->name > 0 && avctx->name <= 0) avctx->name = s->name
+ if (avctx->codec_type == AVMEDIA_TYPE_VIDEO) {
+ FILL(field_order);
+ }
+
/* update the file pointer */
if (*poutbuf_size) {
/* fill the data for the current frame */
--
2.10.0
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