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[2003:d5:e74f:bd80:d1a4:672d:1989:4bfd]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8795169dd6sm48162766b.27.2026.01.15.13.48.03 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 15 Jan 2026 13:48:03 -0800 (PST) To: ffmpeg-devel@ffmpeg.org Date: Thu, 15 Jan 2026 22:47:11 +0100 Message-ID: <20260115214711.94490-1-laura@hausmann.dev> X-Mailer: git-send-email 2.48.1 MIME-Version: 1.0 X-MailFrom: SRS0=X8N0=7U=backslash.pw=laura@ffmpeg.org X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation Message-ID-Hash: PIHIB5F5UWG3PNQ6RVNBGV7MELEGUFGO X-Message-ID-Hash: PIHIB5F5UWG3PNQ6RVNBGV7MELEGUFGO X-Mailman-Approved-At: Wed, 21 Jan 2026 04:30:47 +0000 X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PATCH] avformat/dashdec: fix calc_min_seg_no underflow List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: Laura Hausmann via ffmpeg-devel Cc: Laura Hausmann Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: Fixes an integer underflow in calc_min_seg_no in cases where availability_start_time - time_shift_buffer_depth is negative (i.e. the stream started within one time_shift_buffer_depth window). --- libavformat/dashdec.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c index 500d8ca..4a0b368 100644 --- a/libavformat/dashdec.c +++ b/libavformat/dashdec.c @@ -1438,8 +1438,15 @@ static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls) int64_t num = 0; if (c->is_live && pls->fragment_duration) { + uint64_t current_time_in_sec = get_current_time_in_sec(); av_log(s, AV_LOG_TRACE, "in live mode\n"); - num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration; + if (current_time_in_sec - c->availability_start_time < c->time_shift_buffer_depth) { + av_log(s, AV_LOG_TRACE, "timeShiftBufferDepth not reached yet\n"); + num = pls->first_seq_no; + } + else { + num = pls->first_seq_no + (((current_time_in_sec - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration; + } } else { num = pls->first_seq_no; } -- 2.48.1 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org