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]> > <[email protected]> wrote: > > пт, 30 мая 2025 г., 15:55 Terje J. Hanssen <[email protected]> > <[email protected]>: > > Den 30.05.2025 00:15, skrev Andrew Randrianasulu: > > > > пт, 30 мая 2025 г., 00:30 Andrew Randrianasulu <[email protected]> > <[email protected]>: > > чт, 29 мая 2025 г., 23:42 Terje J. Hanssen via Cin > <[email protected]> <[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 > athttps://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 > sceneshttps://linux.die.net/man/1/dvgrabhttps://github.com/amiaopensource/vrecordhttps://github.com/mipops/dvrescue > > Yes, I was thinking about this, but unfortunately without any testable idea. > Sorry. > > >
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