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