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[34.83.118.50]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-748900829d7sm2295613b3a.80.2025.06.13.17.59.29 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 13 Jun 2025 17:59:29 -0700 (PDT) From: softworkz X-Google-Original-From: softworkz Message-Id: <10b1c224396cd0b04485a548e702743f1e8500da.1749862752.git.ffmpegagent@gmail.com> In-Reply-To: References: Date: Sat, 14 Jun 2025 00:59:08 +0000 Fcc: Sent MIME-Version: 1.0 To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH v2 2/6] avformat/segment: Add segment_limit option 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: softworkz 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: From: softworkz Example use case: Existing segments 0-30 and 70-99, 31-69 need to be created. This option allows to stop precisely after 69. Otherwise it would start overwriting segment 70 before stopping via 'q' or break signal. Signed-off-by: softworkz --- doc/muxers.texi | 7 +++++++ libavformat/segment.c | 12 ++++++++++++ 2 files changed, 19 insertions(+) diff --git a/doc/muxers.texi b/doc/muxers.texi index 6d5c17b4cc..1cca8da1fb 100644 --- a/doc/muxers.texi +++ b/doc/muxers.texi @@ -3510,6 +3510,13 @@ packet written. Defaults to @code{0}. Write segments to files with a .tmp extension. Each file is renamed to its actual name on completion. This can help to prevent segment files from being accessed before they are complete. Disabled by default (@code{0}). + +@item segment_limit @var{number} +Stops after the specified number of segments has been generated. +This can be helpful to fill gaps in a range of already generated segments, +which is difficult to achieve otherwise as it would either cause the last +segment to be incomplete or to overwrite an existing segment with a partial +data. Default is @code{0} - no limit. @end table Make sure to require a closed GOP when encoding and to set the GOP diff --git a/libavformat/segment.c b/libavformat/segment.c index 14eba90292..e8b1582e7d 100644 --- a/libavformat/segment.c +++ b/libavformat/segment.c @@ -121,6 +121,8 @@ typedef struct SegmentContext { int break_non_keyframes; int write_empty; + int segment_limit; ///< max number of segments to create + int segment_write_temp; ///< write segments as temp files and rename on completion int use_rename; char temp_list_filename[1024]; @@ -365,6 +367,9 @@ static int segment_end(AVFormatContext *s, int write_trailer, int is_last) int i; int err; + if (seg->segment_limit && seg->segment_count >= seg->segment_limit) + return 0; + if (!oc || !oc->pb) return AVERROR(EINVAL); @@ -879,6 +884,9 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt) int64_t usecs; int64_t wrapped_val; + if (seg->segment_limit && seg->segment_count >= seg->segment_limit) + return 0; + if (!seg->avf || !seg->avf->pb) return AVERROR(EINVAL); @@ -953,6 +961,9 @@ calc_times: if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0) goto fail; + if (seg->segment_limit && seg->segment_count >= seg->segment_limit) + return 0; + if ((ret = segment_start(s, seg->individual_header_trailer)) < 0) goto fail; @@ -1098,6 +1109,7 @@ static const AVOption options[] = { { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E }, { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E }, { "segment_write_temp", "write segments as temp files (.tmp) and rename on completion", OFFSET(segment_write_temp), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E }, + { "segment_limit", "stop output once the specified number of segments has been written", OFFSET(segment_limit), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E }, { NULL }, }; -- ffmpeg-codebot _______________________________________________ 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".