On 2/18/20 9:43 PM, James Almer wrote:
> Signed-off-by: James Almer <[email protected]>
> ---
> libavformat/dashenc.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
> index b910cc22d0..045d2f4df6 100644
> --- a/libavformat/dashenc.c
> +++ b/libavformat/dashenc.c
> @@ -1395,6 +1395,11 @@ static int dash_init(AVFormatContext *s)
> c->frag_type = FRAG_TYPE_EVERY_FRAME;
> }
>
> + if (c->ldash && !c->write_prft) {
> + av_log(s, AV_LOG_INFO, "Enabling Producer Reference Time element for
> Low Latency mode\n");
> + c->write_prft = 1;
> + }
> +
PRFT elements has a significant bitrate overhead, especially in streaming mode
when each frame is a moof fragment.
In terms of percentage of stream's bitrate this overhead will be a significant
% for lower bitrate streams(such as audio streams).
For any application which does not need PRFT this is an unnecessary wastage of
bits.
Hence, I would advise against enabling PRFT without user control.
> if (c->write_prft && !c->utc_timing_url) {
> av_log(s, AV_LOG_WARNING, "Producer Reference Time element option
> will be ignored as utc_timing_url is not set\n");
> c->write_prft = 0;
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