[FFmpeg-devel] [PATCH] avformat/hlsenc: increase initial program date time precision

[Zhao Zhili]

> On Jul 19, 2020, at 5:20 PM, Steven Liu <lingjiujianke at gmail.com> wrote:
> 
> Marton Balint <cus at passwd.hu> 于2020年7月19日周日 上午6:04写道：
>> 
>> Also query time only once, not for every variant stream, otherwise variant
>> streams might get a slightly different initial program date time. And we can
>> set this unconditionally because HLS_PROGRAM_DATE_TIME flag is checked
>> elsewhere.
>> 
>> Signed-off-by: Marton Balint <cus at passwd.hu>
>> ---
>> libavformat/hlsenc.c | 8 ++------
>> 1 file changed, 2 insertions(+), 6 deletions(-)
>> 
>> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
>> index df84e6487d..39ff1fa1e7 100644
>> --- a/libavformat/hlsenc.c
>> +++ b/libavformat/hlsenc.c
>> @@ -2704,6 +2704,7 @@ static int hls_init(AVFormatContext *s)
>>     char *p = NULL;
>>     int http_base_proto = ff_is_http_proto(s->url);
>>     int fmp4_init_filename_len = strlen(hls->fmp4_init_filename) + 1;
>> +    double initial_program_date_time = av_gettime() / 1000000.0;
> is it AV_TIME_BASE?

According to the documentation of av_gettime, it's not related to AV_TIME_BASE.

/**
 * Get the current time in microseconds.
 */
int64_t av_gettime(void);

>> 
>>     if (hls->use_localtime) {
>>         pattern = get_default_pattern_localtime_fmt(s);
>> @@ -2798,12 +2799,7 @@ static int hls_init(AVFormatContext *s)
>>         vs->start_pts = AV_NOPTS_VALUE;
>>         vs->end_pts   = AV_NOPTS_VALUE;
>>         vs->current_segment_final_filename_fmt[0] = '\0';
>> -
>> -        if (hls->flags & HLS_PROGRAM_DATE_TIME) {
>> -            time_t now0;
>> -            time(&now0);
>> -            vs->initial_prog_date_time = now0;
>> -        }
>> +        vs->initial_prog_date_time = initial_program_date_time;
>> 
>>         for (j = 0; j < vs->nb_streams; j++) {
>>             vs->has_video += vs->streams[j]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO;
>> --
>> 2.26.2
>> 
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