[Cin] Segmented Recording from input stream
Andrew Randrianasulu
randrianasulu at gmail.com
Mon Jun 9 18:39:17 CEST 2025
пн, 9 июн. 2025 г., 19:32 Phyllis Smith <phylsmith2017 at gmail.com>:
> Andrew, I have been contemplating this since you brought it up again with
> Terje. Should it be checked into GIT after Terje checks it?
>
if it works ....
May be with # comment line saying for different seg duration change value
here and in corresponding audio file.
> On Sun, Jun 1, 2025 at 1:06 AM Andrew Randrianasulu via Cin <
> cin at lists.cinelerra-gg.org> 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
>> <randrianasulu at gmail.com> wrote:
>> >
>> >
>> >
>> > вс, 1 июн. 2025 г., 00:03 Terje J. Hanssen <terjejhanssen at gmail.com>:
>> >>
>> >>
>> >>
>> >> On 31.05.2025 05:33, Andrew Randrianasulu wrote:
>> >>
>> >> On Fri, May 30, 2025 at 4:27 PM Andrew Randrianasulu
>> >> <randrianasulu at gmail.com> wrote:
>> >>
>> >> пт, 30 мая 2025 г., 15:55 Terje J. Hanssen <terjejhanssen at gmail.com>:
>> >>
>> >> Den 30.05.2025 00:15, skrev Andrew Randrianasulu:
>> >>
>> >>
>> >>
>> >> пт, 30 мая 2025 г., 00:30 Andrew Randrianasulu <
>> randrianasulu at gmail.com>:
>> >>
>> >> чт, 29 мая 2025 г., 23:42 Terje J. Hanssen via Cin <
>> cin at lists.cinelerra-gg.org>:
>> >>
>> >> 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 at 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 at 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 at 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
>> Cin at lists.cinelerra-gg.org
>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>
>
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