Andrew, I have been contemplating this since you brought it up again with Terje. Should it be checked into GIT after Terje checks it?
On Sun, Jun 1, 2025 at 1:06 AM Andrew Randrianasulu via Cin < [email protected]> wrote: > with this patch (git am variety) I can set segment_time in gui, but > for short test video actual cut time was > dominated by same set of six keyframes, in my case. > > On Sun, Jun 1, 2025 at 4:56 AM Andrew Randrianasulu > <[email protected]> wrote: > > > > > > > > вс, 1 июн. 2025 г., 00:03 Terje J. Hanssen <[email protected]>: > >> > >> > >> > >> On 31.05.2025 05:33, Andrew Randrianasulu wrote: > >> > >> On Fri, May 30, 2025 at 4:27 PM Andrew Randrianasulu > >> <[email protected]> wrote: > >> > >> пт, 30 мая 2025 г., 15:55 Terje J. Hanssen <[email protected]>: > >> > >> Den 30.05.2025 00:15, skrev Andrew Randrianasulu: > >> > >> > >> > >> пт, 30 мая 2025 г., 00:30 Andrew Randrianasulu <[email protected] > >: > >> > >> чт, 29 мая 2025 г., 23:42 Terje J. Hanssen via Cin < > [email protected]>: > >> > >> Is it possible with CinGG's Record utility (via FFMPEG) to record a > stream to file segments of same duration or file size and use auto-naming? > >> > >> Typical example: > >> Record a video/audio input stream (i.e from playing a camcorder tape > cassette) and encode to output file segments of 10 minutes or 10 GB each > and auto-name file numbers. > >> > >> Similar example code using an input file instead at > >> > https://unix.stackexchange.com/questions/1670/how-can-i-use-ffmpeg-to-split-mpeg-video-into-10-minute-chunks > >> > >> Just use what is built into ffmpeg to do exactly this. > >> > >> ffmpeg -i invid.mp4 -threads 3 \ > >> -vcodec copy -f segment -segment_time 10:00 \ > >> -reset_timestamps 1 \ > >> cam_out_h264_%02d.mp4 > >> > >> This will split it into roughly 10-minute chunks, split at the relevant > keyframes, and will output to the files cam_out_h264_01.mp4, > cam_out_h264_02.mp4, etc. > >> > >> Very interesting question! Never tried this, did not even know it > existed! > >> > >> As long as this -f just ordinary avformat muxer you probably can copy > your favourite ffmpeg video/audio profiles with new .seg name and put > "segmented" at very first line there , where "mov" or "matroska" or other > format name was, and add rest of options. And add pattern (%02d) into name > just as with ffmpeg-based image lists. > >> > >> I'll try this with termux's version, but I do not have audio here so it > will be incomplete. > >> > >> so I created this file: > >> > >> cat ffmpeg/video/mpeg2.seg > >> segment mpeg2video > >> segment_format=mpeg > >> segment_time=00:10 > >> reset_timestamps=1 > >> trellis=2 > >> mbd=rd > >> cmp=2 > >> subcmp=2 > >> b=4000000 > >> > >> > >> and it worked! in sense it created six segments, each with > corresponding increasing timecode. But they all uneven duration, probably > due to mpeg2 codec placing keyframes at will. > >> > >> You can try to modify it back to 10:00 segment time and see how it work > for longer encode? > >> > >> > >> As I'm not sure if and how you applied your file above with regards to > Cingg Record, > >> > >> just put file where other video profiles live? (ffmpeg/video folder of > your cingg installation) > >> > >> Attaching test profile trying to utilize segmented muxer for mpeg > >> system streams > >> > >> Put them according to their content into > >> > >> /usr/share/cin/ffmpeg/video and /usr/share/cin/ffmpeg/audio for > >> standard rpm/deb cinelerra install > >> > >> make sure they readable by your user (chown -R your_username:users > >> /usr/share/cin/ffmpeg might fix weird issues like "bad file format") > >> > >> > >> I upgraded to the latest rpm for Leap15.6 > >> > >> terje@localhost:/usr/share/cin/ffmpeg> ls -lt audio/*.seg audio/seg.* > video/*.seg video/seg.* > >> -rw-r--r-- 1 terje users 159 mai 31 17:49 video/mpeg2.seg > >> -rw-r--r-- 1 terje users 14 mai 31 17:49 video/seg.dfl > >> -rw-r--r-- 1 terje users 77 mai 31 17:47 audio/mpeg2_mp2.seg > >> -rw-r--r-- 1 terje users 14 mai 31 17:47 audio/seg.dfl > >> > >> In cingg shift-R, select seg from dropdown menu, select both audio and > >> video encoding (there will be grand total of one choice in each > >> category), > >> then put filename like /dev/shm/file%02d.mpeg and try to render > >> > >> It will give you files: > >> > >> > >> Loaded a hdv 1080i50 file > >> Very short segments, maybe just 10 sec each > >> > >> root@slax:~# ls -la /dev/shm/seg* > >> -rw-r--r-- 1 guest users 0 мая 31 06:19 /dev/shm/seg%02d.mpeg > >> -rw-r--r-- 1 guest users 0 мая 31 05:57 /dev/shm/seg%02d.seg > >> -rw-r--r-- 1 guest users 2375680 мая 31 06:19 /dev/shm/seg00.mpeg > >> -rw-r--r-- 1 guest users 1980416 мая 31 06:19 /dev/shm/seg01.mpeg > >> -rw-r--r-- 1 guest users 1947648 мая 31 06:19 /dev/shm/seg02.mpeg > >> -rw-r--r-- 1 guest users 2009088 мая 31 06:19 /dev/shm/seg03.mpeg > >> -rw-r--r-- 1 guest users 2170880 мая 31 06:19 /dev/shm/seg04.mpeg > >> -rw-r--r-- 1 guest users 2205696 мая 31 06:19 /dev/shm/seg05.mpeg > >> -rw-r--r-- 1 guest users 2535424 мая 31 06:19 /dev/shm/seg06.mpeg > >> -rw-r--r-- 1 guest users 1966080 мая 31 06:19 /dev/shm/seg07.mpeg > >> -rw-r--r-- 1 guest users 1945600 мая 31 06:19 /dev/shm/seg08.mpeg > >> -rw-r--r-- 1 guest users 2023424 мая 31 06:19 /dev/shm/seg09.mpeg > >> -rw-r--r-- 1 guest users 2101248 мая 31 06:19 /dev/shm/seg10.mpeg > >> -rw-r--r-- 1 guest users 1026048 мая 31 06:19 /dev/shm/seg11.mpeg > >> > >> Now you can play all fo them gapless with mpv: > >> > >> > >> mpv worked best for audio, though blocking pixels in the video > >> vlc got dropouts in audio also within a segment > >> > >> Tried similar with Shift-P: 1920x1080, 50fps, yuv422 and mpeg2_hq > profile changed to 50Mbps bitrate, then r (record from v4l2 /dev/video0 > (ms2130) > >> Got short segments, yuv422 at low bitrate > > > > > > > > You need to set bitrate explicitly for this profile, I think? > > > > in GUI or just add b=16M or what you like. > > > > Right now for longer segments you need to modify both profiles manually > and set segment_time to value you want in both audio and video *.seg > profiles > > > > If it works I think I know where in cingg code I should put override so > our gui for format (muxer) options will work (right now it stumbles on > difference between seg and segment ) > > > >> > >> root@slax:~# mpv /dev/shm/se*.mpeg > >> Playing: /dev/shm/seg%02d.mpeg > >> Failed to recognize file format. > >> Playing: /dev/shm/seg00.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AO: [pulse] 48000Hz stereo 2ch s16 > >> VO: [gpu] 720x576 => 768x576 yuv420p > >> AV: 00:00:02 / 00:00:02 (97%) A-V: 0.000 > >> Playing: /dev/shm/seg01.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg02.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg03.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg04.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg05.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg06.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:02 / 00:00:02 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg07.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg08.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg09.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg10.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:01 / 00:00:01 (98%) A-V: 0.000 > >> Playing: /dev/shm/seg11.mpeg > >> (+) Video --vid=1 (mpeg2video 720x576 25.000fps) > >> (+) Audio --aid=1 (mp2 2ch 48000Hz) > >> AV: 00:00:00 / 00:00:01 (91%) A-V: 0.000 > >> Exiting... (Some errors happened) > >> > >> > >> I've verified that at least audio track exist, but you better to run > >> your own liestening test to hear if audio get desynchronized over > >> longer runs > >> > >> What worries me is audio. If segmented audio muxer cut it differently > from video we will get desync. > >> > >> May be setting labels at specific intervals and then using "write new > file at label" checkbox is better idea? > >> > >> > >> I simply did a test with my system's ffmpeg segment muxer: > >> > https://ffmpeg.org/ffmpeg-formats.html#segment_002c-stream_005fsegment_002c-ssegment > >> > >> Input file: hdv09_04_h264.mp4 > >> Duration: 00:03:58.88, start: 0.000000, bitrate: 8963 kb/s > >> > >> Tried 1 minute segment time: > >> > >> ffmpeg -hide_banner -i hdv09_04_h264.mp4 -threads 3 \ > >> -vcodec copy -f segment -segment_time 01:00 \ > >> -reset_timestamps 1 \ > >> cam_out_h264_%02d.mp4 > >> > >> [segment @ 0x563c2874fa80] Opening 'cam_out_h264_01.mp4' for > writingeed=52.1x > >> [segment @ 0x563c2874fa80] Opening 'cam_out_h264_02.mp4' for > writingeed=55.5x > >> [segment @ 0x563c2874fa80] Opening 'cam_out_h264_03.mp4' for > writingeed= 57x > >> [out#0/segment @ 0x563c28727680] video:257421KiB audio:3749KiB > subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: > unknown > >> frame= 5972 fps=1445 q=-1.0 Lsize=N/A time=00:03:58.80 bitrate=N/A > speed=57.8x > >> [aac @ 0x563c28721a40] Qavg: 454.522 > >> > >> 68M cam_out_h264_00.mp4 > >> 63M cam_out_h264_01.mp4 > >> 59M cam_out_h264_02.mp4 > >> 68M cam_out_h264_03.mp4 > >> -------- > >> > >> Duration: 00:01:00.38, start: 0.058000, bitrate: 9394 kb/s > >> Duration: 00:01:00.00, start: 0.000000, bitrate: 8672 kb/s > >> Duration: 00:01:00.60, start: 0.000000, bitrate: 8104 kb/s > >> Duration: 00:00:57.93, start: 0.000000, bitrate: 9705 kb/s > >> > >> In total: 00:03:58.93 which is 00:00:00.03 (=3/100 sek) more than > the input file > >> which I think is good enough for practical purposes (editing and > backup/preservation/archival) > >> > >> I wonder if it is within or out of our reach to make some targeted > profiles for backup/preservation? > >> I.e would it be of interest and possible to utilize/integrate/use oss > tools and scripts as found here: > >> https://avpres.net/Bash_AVpres/ > >> https://avpres.net/FFmpeg/im_FFV1.html > >> > >> Up to interested party, I guess. > >> > >> > >> The programs dvgrab and possibly the newer vrecord can also autosplit > by scenes > >> https://linux.die.net/man/1/dvgrab > >> https://github.com/amiaopensource/vrecord > >> https://github.com/mipops/dvrescue > >> > >> Yes, I was thinking about this, but unfortunately without any testable > idea. Sorry. > >> > >> > -- > Cin mailing list > [email protected] > https://lists.cinelerra-gg.org/mailman/listinfo/cin >
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