From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id A497A47614 for ; Thu, 14 Mar 2024 17:58:01 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id DB49B68D16C; Thu, 14 Mar 2024 19:57:49 +0200 (EET) Received: from srv-infra-1.infra.inf.glb.tvvideoms.com (www.inf.tvvideoms.com [213.205.126.156]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 3E6F968CE1C for ; Thu, 14 Mar 2024 19:57:42 +0200 (EET) Received: from cji.paris (unknown [172.16.3.159]) by srv-infra-1.infra.inf.glb.tvvideoms.com (Postfix) with ESMTP id 37D322076F; Thu, 14 Mar 2024 17:57:41 +0000 (UTC) From: Nicolas Gaullier To: ffmpeg-devel@ffmpeg.org Date: Thu, 14 Mar 2024 18:57:39 +0100 Message-Id: <20240314175739.1499196-2-nicolas.gaullier@cji.paris> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20240314175739.1499196-1-nicolas.gaullier@cji.paris> References: <20240314175739.1499196-1-nicolas.gaullier@cji.paris> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 1/1] avformat/demux: Fix accurate probing of durations in mpegts/ps 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 Cc: Nicolas Gaullier Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Two issues affect accuracy of duration in estimate_timings_from_pts(): - pkt->duration typically reports the duration of a single audio frame, whereas a pes often contain several audio frames - for video, compute_frame_duration() use r_frame_rate which is not reliable; typically, it is the duration of a single field for an interlaced video using two field pictures. Packet splitting/parsing is required to get accurate durations, so this patch replaces ff_read_packet() calls by av_read_frame() calls. Note that concatdec makes use of avformat_find_stream_info() to stitch correctly the files, so it benefits from this patch (typically, overlap is avoided). e.g. in fate/concat-demuxer-simple2-lavf-ts: the input audio stream duration is now longer than that of the video, which results in concatdec joining on audio after the patch instead of joining on video before that. Signed-off-by: Nicolas Gaullier --- libavformat/demux.c | 30 +--- tests/ref/fate/concat-demuxer-simple2-lavf-ts | 170 +++++++++--------- tests/ref/fate/ts-opus-demux | 4 +- 3 files changed, 93 insertions(+), 111 deletions(-) diff --git a/libavformat/demux.c b/libavformat/demux.c index 4c50eb5568..7e75e7149c 100644 --- a/libavformat/demux.c +++ b/libavformat/demux.c @@ -1820,20 +1820,17 @@ static void estimate_timings_from_bit_rate(AVFormatContext *ic) #define DURATION_MAX_READ_SIZE 250000LL #define DURATION_MAX_RETRY 6 -/* only usable for MPEG-PS streams */ +/* only usable for MPEG-PS/TS streams */ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset) { FFFormatContext *const si = ffformatcontext(ic); AVPacket *const pkt = si->pkt; - int num, den, read_size, ret; + int read_size, ret; int found_duration = 0; int is_end; int64_t filesize, offset, duration; int retry = 0; - /* flush packet queue */ - ff_flush_packet_queue(ic); - for (unsigned i = 0; i < ic->nb_streams; i++) { AVStream *const st = ic->streams[i]; FFStream *const sti = ffstream(st); @@ -1843,11 +1840,6 @@ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset) st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) av_log(ic, AV_LOG_WARNING, "start time for stream %d is not set in estimate_timings_from_pts\n", i); - - if (sti->parser) { - av_parser_close(sti->parser); - sti->parser = NULL; - } } if (ic->skip_estimate_duration_from_pts) { @@ -1865,6 +1857,7 @@ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset) if (offset < 0) offset = 0; + ff_read_frame_flush(ic); avio_seek(ic->pb, offset, SEEK_SET); read_size = 0; for (;;) { @@ -1874,7 +1867,7 @@ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset) break; do { - ret = ff_read_packet(ic, pkt); + ret = av_read_frame(ic, pkt); } while (ret == AVERROR(EAGAIN)); if (ret != 0) break; @@ -1884,15 +1877,6 @@ static void estimate_timings_from_pts(AVFormatContext *ic, int64_t old_offset) if (pkt->pts != AV_NOPTS_VALUE && (st->start_time != AV_NOPTS_VALUE || sti->first_dts != AV_NOPTS_VALUE)) { - if (pkt->duration == 0) { - compute_frame_duration(ic, &num, &den, st, sti->parser, pkt); - if (den && num) { - pkt->duration = av_rescale_rnd(1, - num * (int64_t) st->time_base.den, - den * (int64_t) st->time_base.num, - AV_ROUND_DOWN); - } - } duration = pkt->pts + pkt->duration; found_duration = 1; if (st->start_time != AV_NOPTS_VALUE) @@ -1948,15 +1932,13 @@ skip_duration_calc: fill_all_stream_timings(ic); avio_seek(ic->pb, old_offset, SEEK_SET); + + ff_read_frame_flush(ic); for (unsigned i = 0; i < ic->nb_streams; i++) { AVStream *const st = ic->streams[i]; FFStream *const sti = ffstream(st); sti->cur_dts = sti->first_dts; - sti->last_IP_pts = AV_NOPTS_VALUE; - sti->last_dts_for_order_check = AV_NOPTS_VALUE; - for (int j = 0; j < MAX_REORDER_DELAY + 1; j++) - sti->pts_buffer[j] = AV_NOPTS_VALUE; } } diff 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+format|filename=test-8-7.1.opus-small.ts|nb_streams=1|nb_programs=1|nb_stream_groups=0|format_name=mpegts|start_time=0.000000|duration=10.240000|size=512000|bit_rate=400000|probe_score=50 -- 2.30.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".