When encoding a DASH stream in live ("dynamic") mode without timeline,
the field "availabilityStartTime" is set to the system time. The new
options allows the libavformat user to pass a specific time to be used
instead of the system time.
---
libavformat/dashenc.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index d4a6fe0304..e586e934cb 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -204,6 +204,7 @@ typedef struct DASHContext {
AVRational min_playback_rate;
AVRational max_playback_rate;
int64_t update_period;
+ int64_t start_time_ms;
} DASHContext;
static const struct codec_string {
@@ -2108,7 +2109,12 @@ static int dash_write_packet(AVFormatContext *s,
AVPacket *pkt)
os->last_pts = pkt->pts;
if (!c->availability_start_time[0]) {
- int64_t start_time_us = av_gettime();
+ int64_t start_time_us;
+ if (c->start_time_ms) {
+ start_time_us = c->start_time_ms * 1000;
+ } else {
+ start_time_us = av_gettime();
+ }
c->start_time_s = start_time_us / 1000000;
format_date(c->availability_start_time,
sizeof(c->availability_start_time), start_time_us);
@@ -2393,6 +2399,7 @@ static const AVOption options[] = {
{ "seg_duration", "segment duration (in seconds, fractional value can be
set)", OFFSET(seg_duration), AV_OPT_TYPE_DURATION, { .i64 = 5000000 }, 0,
INT_MAX, E },
{ "single_file", "Store all segments in one file, accessed using byte
ranges", OFFSET(single_file), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "single_file_name", "DASH-templated name to be used for baseURL. Implies
storing all segments in one file, accessed using byte ranges",
OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
+ { "start_time_ms", "Stream start time in epoch milliseconds",
OFFSET(start_time_ms), AV_OPT_TYPE_INT64, {.i64 = 0}, 0, UINT64_MAX, E, .unit =
"ms"},
{ "streaming", "Enable/Disable streaming mode of output. Each frame will
be moof fragment", OFFSET(streaming), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
{ "target_latency", "Set desired target latency for Low-latency dash",
OFFSET(target_latency), AV_OPT_TYPE_DURATION, { .i64 = 0 }, 0, INT_MAX, E },
{ "timeout", "set timeout for socket I/O operations", OFFSET(timeout),
AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT_MAX, .flags = E },
--
2.43.0
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