[FFmpeg-devel] [PATCH] avformat/libsrt: Change latency option to milliseconds
Limin Wang
lance.lmwang at gmail.com
Wed Apr 8 04:45:57 EEST 2020
On Wed, Apr 08, 2020 at 02:16:23AM +0200, pkv wrote:
> Hi
>
> Le 08/04/2020 à 12:33 am, Limin Wang a écrit :
> >On Tue, Apr 07, 2020 at 08:25:44PM +0200, pkv wrote:
> >>Hi
> >>
> >>new patch for latency option following the comments from N. George.
> >I recall I had submit a patchset for related option incliding latency.
> >https://patchwork.ffmpeg.org/project/ffmpeg/patch/20200331140808.8839-2-lance.lmwang@gmail.com/
>
> hadn't spotted it; why was it not merged ?
>
>
> >
> >Why I haven't change to use AV_OPT_TYPE_DURATION, for the latency can
> >be used in format srt://xxxx:port?latency=?, it's in unit of ms,
> >in addition, AV_OPT_TYPE_DURATION is in unit of second default, it'll
> >break the old user.
> i tested with ffmpeg.exe; the change to
>
> AV_OPT_TYPE_DURATION
>
> didn't seem to break anything.
>
> The default is still set to whatever the libsrt API has set (120 ms
> for transtype=live).
>
> Can you produce code broken by that change ?
What's your command line?
I recall If use AV_OPT_TYPE_DURATION for option, the default is in unit of second if your
don't add suffix of ms, us. However the old is us, so it'll cause old user
setting broken.
>
> Regards
>
>
> >
> >>=====
> >>
> >>Updated protocol doc for srt to specify the unit of various latency options.
> >>Furthermore the type of the latency options is changed to
> >>AV_OPT_TYPE_DURATION
> >>(following comment from N. George).
> >>
> >>The microsecond unit has caused confusion for both FFmpeg and
> >>obs-studio users:
> >>- https://github.com/Haivision/srt/issues/1223
> >>
> >>- https://obsproject.com/mantis/view.php?id=1617
> >>
> >>=====
> >>
> >>Regards
> >>
> >> From 1dd49812553f44bc5f1ed60660a2365d6a036c97 Mon Sep 17 00:00:00 2001
> >>From: pkv <pkv at obsproject.com>
> >>Date: Tue, 7 Apr 2020 18:08:22 +0200
> >>Subject: [PATCH] avformat/libsrt: Document latency options unit
> >>
> >>Updated protocol doc for srt to specify the unit of various latency options.
> >>Furthermore the type of the latency options is changed to AV_OPT_TYPE_DURATION
> >>(following comment from N. George).
> >>
> >>The microsecond unit has caused confusion for both FFmpeg and obs-studio users:
> >>- https://github.com/Haivision/srt/issues/1223
> >>
> >>- https://obsproject.com/mantis/view.php?id=1617
> >>---
> >> doc/protocols.texi | 6 +++---
> >> libavformat/libsrt.c | 6 +++---
> >> 2 files changed, 6 insertions(+), 6 deletions(-)
> >>
> >>diff --git a/doc/protocols.texi b/doc/protocols.texi
> >>index e510019f2d..ebf9dec529 100644
> >>--- a/doc/protocols.texi
> >>+++ b/doc/protocols.texi
> >>@@ -1286,8 +1286,8 @@ IP Type of Service. Applies to sender only. Default value is 0xB8.
> >> @item ipttl=@var{ttl}
> >> IP Time To Live. Applies to sender only. Default value is 64.
> >>- at item latency
> >>-Timestamp-based Packet Delivery Delay.
> >>+ at item latency=@var{microseconds}
> >>+Timestamp-based Packet Delivery Delay in microseconds.
> >> Used to absorb bursts of missed packet retransmissions.
> >> This flag sets both @option{rcvlatency} and @option{peerlatency}
> >> to the same value. Note that prior to version 1.3.0
> >>@@ -1389,7 +1389,7 @@ Not required on receiver (set to 0),
> >> key size obtained from sender in HaiCrypt handshake.
> >> Default value is 0.
> >>- at item rcvlatency
> >>+ at item rcvlatency at var{microseconds}
> >> The time that should elapse since the moment when the
> >> packet was sent and the moment when it's delivered to
> >> the receiver application in the receiving function.
> >>diff --git a/libavformat/libsrt.c b/libavformat/libsrt.c
> >>index 2d6fc4b7e7..5c61f9e0d7 100644
> >>--- a/libavformat/libsrt.c
> >>+++ b/libavformat/libsrt.c
> >>@@ -118,10 +118,10 @@ static const AVOption libsrt_options[] = {
> >> { "iptos", "IP Type of Service", OFFSET(iptos), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 255, .flags = D|E },
> >> { "inputbw", "Estimated input stream rate", OFFSET(inputbw), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >> { "oheadbw", "MaxBW ceiling based on % over input stream rate", OFFSET(oheadbw), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 100, .flags = D|E },
> >>- { "latency", "receiver delay to absorb bursts of missed packet retransmissions", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>+ { "latency", "receiver delay to absorb bursts of missed packet retransmissions", OFFSET(latency), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >> { "tsbpddelay", "deprecated, same effect as latency option", OFFSET(latency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>- { "rcvlatency", "receive latency", OFFSET(rcvlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>- { "peerlatency", "peer latency", OFFSET(peerlatency), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>+ { "rcvlatency", "receive latency", OFFSET(rcvlatency), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>+ { "peerlatency", "peer latency", OFFSET(peerlatency), AV_OPT_TYPE_DURATION, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >> { "tlpktdrop", "Enable receiver pkt drop", OFFSET(tlpktdrop), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
> >> { "nakreport", "Enable receiver to send periodic NAK reports", OFFSET(nakreport), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
> >> { "connect_timeout", "Connect timeout. Caller default: 3000, rendezvous (x 10)", OFFSET(connect_timeout), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT64_MAX, .flags = D|E },
> >>--
> >>2.24.1.windows.2
> >>
> >>_______________________________________________
> >>ffmpeg-devel mailing list
> >>ffmpeg-devel at ffmpeg.org
> >>https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >>
> >>To unsubscribe, visit link above, or email
> >>ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".
> >
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".
--
Thanks,
Limin Wang
More information about the ffmpeg-devel
mailing list