nut coded pts is unsigned, so we need to shift all timestamps to avoid any
negative pts
---
libavformat/nut.h | 1 +
libavformat/nutenc.c | 11 +++++++++--
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/libavformat/nut.h b/libavformat/nut.h
index 419b123..2b781dc 100644
--- a/libavformat/nut.h
+++ b/libavformat/nut.h
@@ -101,6 +101,7 @@ typedef struct {
int header_count;
AVRational *time_base;
struct AVTreeNode *syncpoints;
+ int64_t global_delay;
} NUTContext;
extern const AVCodecTag ff_nut_subtitle_tags[];
diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
index ae1c2f1..b597ea9 100644
--- a/libavformat/nutenc.c
+++ b/libavformat/nutenc.c
@@ -702,8 +702,15 @@ static int nut_write_packet(AVFormatContext *s, AVPacket
*pkt){
int store_sp=0;
int ret;
- if(pkt->pts < 0)
- return -1;
+ /* Shift timestamps to avoid negative pts, which are not allowed in nut.
+ We use the smallest dts as a reference point because pts can be
+ out-of-order and we need to apply the global delay to all packets. */
+ if (pkt->dts < 0 && !nut->global_delay)
+ nut->global_delay = -pkt->dts;
+ if (nut->global_delay) {
+ pkt->pts += nut->global_delay;
+ pkt->dts += nut->global_delay;
+ }
if(1LL<<(20+3*nut->header_count) <= avio_tell(bc))
write_headers(s, bc);
--
1.7.1
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