From patchwork Sat Jun 25 08:13:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gyan Doshi X-Patchwork-Id: 36421 Delivered-To: ffmpegpatchwork2@gmail.com Received: by 2002:a05:6a20:8b27:b0:88:1bbf:7fd2 with SMTP id l39csp788687pzh; Sat, 25 Jun 2022 01:14:10 -0700 (PDT) X-Google-Smtp-Source: AGRyM1tihYyJjxPLqHCHfkDQEQvjpNJN1gjEdXDvXc9FdOY3ocvW4STrJMBHY06kSg0j0q1+0FDw X-Received: by 2002:a17:907:628a:b0:6fe:526c:ebc with SMTP id nd10-20020a170907628a00b006fe526c0ebcmr2644381ejc.531.1656144849793; Sat, 25 Jun 2022 01:14:09 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1656144849; cv=none; d=google.com; s=arc-20160816; b=xKmm5mDKTD7o2lHXeMG5rYwAy8TEzKhc/SEgcTcQmQXm3aNraNnVeQVjveJRgzmsaP +VqGEOqL3ZpZ2JoTE2HAvmXGIbyDTtWFiIsjI+6GRBI0d8Ia21LlqjMWCYf6zS6HFlGv TfhfoqRzAmBJB2Bd7ZahPyitStjkHqc1hb3pzcl6Gc1DJgMz0MBI2Q207sS11n2X9vnj zWF3StPHBRRxAKG+3lw2Gm17aSGxZ3K5yTAicM83J/RNgCRovhNiAch/1gEUYWMV4EB9 AC1tOzwr1PDZOZjJOMa+/R/ZCzRuFwefFF0zLWqo06bSMSIX1fhA2PWKdv2LxPpVQrGH Ejfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:reply-to:list-subscribe :list-help:list-post:list-archive:list-unsubscribe:list-id :precedence:subject:mime-version:references:in-reply-to:message-id :date:to:from:delivered-to; bh=0D8c6d4mEkh9n5Qi5vY9uQ2u4XDY97mfdgjca9KHuNk=; b=NMoZ3V60Vphrers2Xem2qrHRmRa3YKJ6xweEEaT8x2tzM2JW+X3yJ1coeRJUxKEmSV 1j+804FCheg0bjfrpT7HZw1lW5970Uz20ZneM268KVh4i3MP0SXYyMagiJJr/JM5ON1s hy9IDsFsI3HAePz3ykRzljFvi4MMyzGM5tU4VlLER4778uNaT/ggWNyaWBWUzWN69c+P PJXBfy+CaLZ+46CDuv+kX/3WAFfAKwspE1M2WuZPv4u51DTftbdxk/CDQIdnHi3XUZVg skaEzJnHvyO498Q8SuiQWVbw+l9BBjS2byTCTvAOXlam25QRUmw+szDzIhTzbr0UzqHl OuBQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org. [79.124.17.100]) by mx.google.com with ESMTP id cr13-20020a170906d54d00b0072642116126si1656676ejc.888.2022.06.25.01.14.09; Sat, 25 Jun 2022 01:14:09 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 8DA2F68B7DA; Sat, 25 Jun 2022 11:13:58 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mout-p-103.mailbox.org (mout-p-103.mailbox.org [80.241.56.161]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id C79E168B7D2 for ; Sat, 25 Jun 2022 11:13:51 +0300 (EEST) Received: from smtp102.mailbox.org (smtp102.mailbox.org [10.196.197.102]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-103.mailbox.org (Postfix) with ESMTPS id 4LVRb14cRjz9sSR for ; Sat, 25 Jun 2022 10:13:49 +0200 (CEST) From: Gyan Doshi To: ffmpeg-devel@ffmpeg.org Date: Sat, 25 Jun 2022 13:43:31 +0530 Message-Id: <20220625081331.11832-2-ffmpeg@gyani.pro> In-Reply-To: <20220625081331.11832-1-ffmpeg@gyani.pro> References: <20220625081331.11832-1-ffmpeg@gyani.pro> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v2 2/2] ffmpeg: add option -isync X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: 13AtWNLgjMXn This is a per-file input option that adjusts an input's timestamps with reference to another input, so that emitted packet timestamps account for the difference between the start times of the two inputs. Typical use case is to sync two or more live inputs such as from capture devices. Both the target and reference input source timestamps should be based on the same clock source. If not all inputs have timestamps, the wallclock times at the time of reception of inputs shall be used. --- doc/ffmpeg.texi | 16 ++++++++++++ fftools/ffmpeg.h | 2 ++ fftools/ffmpeg_opt.c | 59 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 77 insertions(+) diff --git a/doc/ffmpeg.texi b/doc/ffmpeg.texi index d943f4d6f5..92dd584c89 100644 --- a/doc/ffmpeg.texi +++ b/doc/ffmpeg.texi @@ -518,6 +518,22 @@ see @ref{time duration syntax,,the Time duration section in the ffmpeg-utils(1) Like the @code{-ss} option but relative to the "end of file". That is negative values are earlier in the file, 0 is at EOF. +@item -isync @var{input_index} (@emph{input}) +Assign an input as a sync source. + +This will take the difference between the start times of the target and referenced inputs and +offset the timestamps of the target file by that difference. The source timestamps of the two +inputs should derive from the same clock source for expected results. If @code{copyts} is set +then @code{start_at_zero} must also be set. If at least one of the inputs has no starting +timestamp then the wallclock time at time of reception of the inputs is used as a best-effort +sync basis. + +Acceptable values are those that refer to a valid ffmpeg input index. If the sync reference is +the target index itself or @var{-1}, then no adjustment is made to target timestamps. A sync +reference may not itself be synced to any other input. + +Default value is var{-1}. + @item -itsoffset @var{offset} (@emph{input}) Set the input time offset. diff --git a/fftools/ffmpeg.h b/fftools/ffmpeg.h index 69a368b8d1..dc74de6684 100644 --- a/fftools/ffmpeg.h +++ b/fftools/ffmpeg.h @@ -118,6 +118,7 @@ typedef struct OptionsContext { float readrate; int accurate_seek; int thread_queue_size; + int input_sync_ref; SpecifierOpt *ts_scale; int nb_ts_scale; @@ -410,6 +411,7 @@ typedef struct InputFile { at the moment when looping happens */ AVRational time_base; /* time base of the duration */ int64_t input_ts_offset; + int input_sync_ref; int64_t ts_offset; int64_t last_ts; diff --git a/fftools/ffmpeg_opt.c b/fftools/ffmpeg_opt.c index e08455478f..de858efbe9 100644 --- a/fftools/ffmpeg_opt.c +++ b/fftools/ffmpeg_opt.c @@ -235,6 +235,7 @@ static void init_options(OptionsContext *o) o->chapters_input_file = INT_MAX; o->accurate_seek = 1; o->thread_queue_size = -1; + o->input_sync_ref = -1; } static int show_hwaccels(void *optctx, const char *opt, const char *arg) @@ -287,6 +288,58 @@ static int parse_and_set_vsync(const char *arg, int *vsync_var, int file_idx, in return 0; } +static int apply_sync_offsets(void) +{ + for (int i = 0; i < nb_input_files; i++) { + InputFile *ref, *self = input_files[i]; + int64_t adjustment; + int64_t self_start_time, ref_start_time, self_seek_start, ref_seek_start; + int sync_fpw = 0; + + if (self->input_sync_ref == -1 || self->input_sync_ref == i) continue; + if (self->input_sync_ref >= nb_input_files || self->input_sync_ref < -1) { + av_log(NULL, AV_LOG_FATAL, "-isync for input %d references non-existent input %d.\n", i, self->input_sync_ref); + exit_program(1); + } + + if (copy_ts && !start_at_zero) { + av_log(NULL, AV_LOG_FATAL, "Use of -isync requires that start_at_zero be set if copyts is set.\n"); + exit_program(1); + } + + ref = input_files[self->input_sync_ref]; + if (ref->input_sync_ref != -1 && ref->input_sync_ref != self->input_sync_ref) { + av_log(NULL, AV_LOG_ERROR, "-isync for input %d references a resynced input %d. Sync not set.\n", i, self->input_sync_ref); + continue; + } + + if (self->ctx->start_time_realtime != AV_NOPTS_VALUE && ref->ctx->start_time_realtime != AV_NOPTS_VALUE) { + self_start_time = self->ctx->start_time_realtime; + ref_start_time = ref->ctx->start_time_realtime; + } else if (self->ctx->start_time != AV_NOPTS_VALUE && ref->ctx->start_time != AV_NOPTS_VALUE) { + self_start_time = self->ctx->start_time; + ref_start_time = ref->ctx->start_time; + } else { + self_start_time = self->ctx->first_pkt_wallclock; + ref_start_time = ref->ctx->first_pkt_wallclock; + sync_fpw = 1; + } + + self_seek_start = self->start_time == AV_NOPTS_VALUE ? 0 : self->start_time; + ref_seek_start = ref->start_time == AV_NOPTS_VALUE ? 0 : ref->start_time; + + adjustment = (self_start_time - ref_start_time) + !copy_ts*(self_seek_start - ref_seek_start) + ref->input_ts_offset; + + self->ts_offset += adjustment; + + av_log(NULL, AV_LOG_INFO, "Adjusted ts offset for Input #%d by %"PRId64"d us to sync with Input #%d", i, adjustment, self->input_sync_ref); + if (sync_fpw) av_log(NULL, AV_LOG_INFO, " using reception wallclock time. Sync may not be obtained"); + av_log(NULL, AV_LOG_INFO, ".\n"); + } + + return 0; +} + static int opt_filter_threads(void *optctx, const char *opt, const char *arg) { av_free(filter_nbthreads); @@ -1305,6 +1358,7 @@ static int open_input_file(OptionsContext *o, const char *filename) f->ist_index = nb_input_streams - ic->nb_streams; f->start_time = o->start_time; f->recording_time = o->recording_time; + f->input_sync_ref = o->input_sync_ref; f->input_ts_offset = o->input_ts_offset; f->ts_offset = o->input_ts_offset - (copy_ts ? (start_at_zero && ic->start_time != AV_NOPTS_VALUE ? ic->start_time : 0) : timestamp); f->nb_streams = ic->nb_streams; @@ -3489,6 +3543,8 @@ int ffmpeg_parse_options(int argc, char **argv) goto fail; } + apply_sync_offsets(); + /* create the complex filtergraphs */ ret = init_complex_filters(); if (ret < 0) { @@ -3603,6 +3659,9 @@ const OptionDef options[] = { { "accurate_seek", OPT_BOOL | OPT_OFFSET | OPT_EXPERT | OPT_INPUT, { .off = OFFSET(accurate_seek) }, "enable/disable accurate seeking with -ss" }, + { "isync", HAS_ARG | OPT_INT | OPT_OFFSET | + OPT_EXPERT | OPT_INPUT, { .off = OFFSET(input_sync_ref) }, + "Indicate the input index for sync reference", "sync ref" }, { "itsoffset", HAS_ARG | OPT_TIME | OPT_OFFSET | OPT_EXPERT | OPT_INPUT, { .off = OFFSET(input_ts_offset) }, "set the input ts offset", "time_off" },