Answers.Body: <p>Your split files are smaller because they are being recompressed.</p>
  <p>The split files have a bit-rate of 75.9 kbps.</p>
  <p>The original file had a bit-rate of 7,577 kbps.</p>
  <p>Optimise this by deciding what bit-rate you need to record at. This will be a trade off between file size and image quality needed.</p>
  <p>Check the amount of free space left on your drive before you record.</p>
  <p>Use a <a href="https://toolstud.io/video/filesize.php?width=1920&amp;height=1080&amp;framerate=25&amp;timeduration=60&amp;timeduration_unit=seconds&amp;compression=19290&amp;specificbitrate=100&amp;specificbitrate_unit=1000000" rel="nofollow noreferrer">video file size calculator</a> to work out how much space your recordings will take up.</p>
  <p>Bear in mind that other apps and your OS may use some space over time on the drive to swap files etc.</p>
  
Answers.ContentLicense: CC BY-SA 4.0
Answers.CreationDate: 2023-03-02T15:18:47.270Z
Answers.LastActivityDate: 2023-03-02T15:18:47.270Z
Answers.UserDisplayName: tomh
Body: <p>Sorry I do not give better details, I am too new on this</p>
  <p>this weekend we left OBS recording a small portion of the screen, with audio, for an university experiment (we have a software that analize noise, but lacks video record)</p>
  <p>today I got a 12 GB file for 11 hours 27 mins, and a space disk error (yep, we were short of space)</p>
  <p>acording Media Info, file settigns are:</p>
  <pre><code>Gneral
  Complete name                            : N:\File.mkv
  Format                                   : Matroska
  Format version                           : Version 4
  File size                                : 12.4 GiB
  Duration                                 : 11 h 27 min
  Overall bit rate                         : 2 577 kb/s
  Writing application                      : Lavf58.76.100
  Writing library                          : Lavf58.76.100
  ErrorDetectionType                       : Per level 1
  
  Video
  ID                                       : 1
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format profile                           : High@L2
  Format settings                          : CABAC / 4 Ref Frames
  Format settings, CABAC                   : Yes
  Format settings, Reference frames        : 4 frames
  Codec ID                                 : V_MPEG4/ISO/AVC
  Duration                                 : 11 h 27 min
  Nominal bit rate                         : 2 500 kb/s
  Width                                    : 192 pixels
  Height                                   : 108 pixels
  Display aspect ratio                     : 16:9
  Frame rate mode                          : Constant
  Frame rate                               : 10.000 FPS
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Progressive
  Bits/(Pixel*Frame)                       : 12.056
  Writing library                          : x264 core 163 r3060 5db6aa6
  Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=10 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=cbr / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=2500 / vbv_bufsize=2500 / nal_hrd=none / filler=1 / ip_ratio=1.40 / aq=1:1.00
  Default                                  : Yes
  Forced                                   : No
  Color range                              : Limited
  Color primaries                          : BT.709
  Transfer characteristics                 : BT.709
  Matrix coefficients                      : BT.709
  
  Audio
  ID                                       : 2
  Format                                   : AAC LC
  Format/Info                              : Advanced Audio Codec Low Complexity
  Codec ID                                 : A_AAC-2
  Duration                                 : 11 h 27 min
  Channel(s)                               : 1 channel
  Channel layout                           : C
  Sampling rate                            : 48.0 kHz
  Frame rate                               : 46.875 FPS (1024 SPF)
  Compression mode                         : Lossy
  Title                                    : simple_aac
  Default                                  : Yes
  Forced                                   : No
  </code></pre>
  <p>as analizing the file by one person is too much, I split in files, with MKVToolNix, and due to creation time, I chose: 01:04:45,04:04:45,07:04:45,10:04:45  (first and last are shorter, other 3 files are 3 hours long).  MKVToolNix suposelly split the file WITHOUT recodification.</p>
  <p>SURPRISE, output file are 40MB, 3 of 100MB, and last of 45 MB, total 375 MB instead of 12 GB</p>
  <p>I got details for the second file:</p>
  <pre><code>General
  Complete name                            : D:\File-002.mkv
  Format                                   : Matroska
  Format version                           : Version 4
  File size                                : 97.8 MiB
  Duration                                 : 3 h 0 min
  Overall bit rate                         : 75.9 kb/s
  Encoded date                             : UTC 2023-02-27 16:15:19
  Writing application                      : mkvmerge v60.0.0 ('Are We Copies?') 64-bit
  Writing library                          : libebml v1.4.2 + libmatroska v1.6.4 / Lavf58.76.100
  
  Video
  ID                                       : 1
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format profile                           : High@L2
  Format settings                          : CABAC / 4 Ref Frames
  Format settings, CABAC                   : Yes
  Format settings, Reference frames        : 4 frames
  Codec ID                                 : V_MPEG4/ISO/AVC
  Duration                                 : 3 h 0 min
  Bit rate                                 : 1 246 b/s
  Width                                    : 192 pixels
  Height                                   : 108 pixels
  Display aspect ratio                     : 16:9
  Frame rate mode                          : Constant
  Frame rate                               : 10.000 FPS
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Progressive
  Bits/(Pixel*Frame)                       : 0.006
  Stream size                              : 1.60 MiB (2%)
  Default                                  : Yes
  Forced                                   : No
  Color range                              : Limited
  Color primaries                          : BT.709
  Transfer characteristics                 : BT.709
  Matrix coefficients                      : BT.709
  
  Audio
  ID                                       : 2
  Format                                   : AAC LC
  Format/Info                              : Advanced Audio Codec Low Complexity
  Codec ID                                 : A_AAC-2
  Duration                                 : 3 h 0 min
  Bit rate                                 : 73.5 kb/s
  Channel(s)                               : 1 channel
  Channel layout                           : C
  Sampling rate                            : 48.0 kHz
  Frame rate                               : 46.875 FPS (1024 SPF)
  Compression mode                         : Lossy
  Delay relative to video                  : 5 ms
  Stream size                              : 94.6 MiB (97%)
  Title                                    : simple_aac
  Default                                  : Yes
  Forced                                   : No
  </code></pre>
  <p>Not sure what has happend, why the file stop after 11 hours, why it takes so much space, and why the splited files are much lower size</p>
  <p>may somebody help us??
  (we need to repeat the experiment, and we need the recording to last for 72 hours straigh)</p>
  
Tags: <audio><video-quality><video-recording><audio-recording><recording>
Title: Recording webcam got too big file in 12 hours, spliting the file takes much less space
UserDisplayName: Carlos Tiel
ThreadText: # Recording webcam got too big file in 12 hours, spliting the file takes much less space
  
  (Asked by: username_0 on 2023-02-27)
  
  Sorry I do not give better details, I am too new on this
  
  this weekend we left OBS recording a small portion of the screen, with audio, for an university experiment (we have a software that analize noise, but lacks video record)
  
  today I got a 12 GB file for 11 hours 27 mins, and a space disk error (yep, we were short of space)
  
  acording Media Info, file settigns are:
  
  ```
  Gneral
  Complete name                            : N:\File.mkv
  Format                                   : Matroska
  Format version                           : Version 4
  File size                                : 12.4 GiB
  Duration                                 : 11 h 27 min
  Overall bit rate                         : 2 577 kb/s
  Writing application                      : Lavf58.76.100
  Writing library                          : Lavf58.76.100
  ErrorDetectionType                       : Per level 1
  
  Video
  ID                                       : 1
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format profile                           : High@L2
  Format settings                          : CABAC / 4 Ref Frames
  Format settings, CABAC                   : Yes
  Format settings, Reference frames        : 4 frames
  Codec ID                                 : V_MPEG4/ISO/AVC
  Duration                                 : 11 h 27 min
  Nominal bit rate                         : 2 500 kb/s
  Width                                    : 192 pixels
  Height                                   : 108 pixels
  Display aspect ratio                     : 16:9
  Frame rate mode                          : Constant
  Frame rate                               : 10.000 FPS
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Progressive
  Bits/(Pixel*Frame)                       : 12.056
  Writing library                          : x264 core 163 r3060 5db6aa6
  Encoding settings                        : cabac=1 / ref=1 / deblock=1:0:0 / analyse=0x3:0x113 / me=hex / subme=2 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=0 / threads=3 / lookahead_threads=1 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=1 / keyint=250 / keyint_min=10 / scenecut=40 / intra_refresh=0 / rc_lookahead=10 / rc=cbr / mbtree=1 / bitrate=2500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=2500 / vbv_bufsize=2500 / nal_hrd=none / filler=1 / ip_ratio=1.40 / aq=1:1.00
  Default                                  : Yes
  Forced                                   : No
  Color range                              : Limited
  Color primaries                          : BT.709
  Transfer characteristics                 : BT.709
  Matrix coefficients                      : BT.709
  
  Audio
  ID                                       : 2
  Format                                   : AAC LC
  Format/Info                              : Advanced Audio Codec Low Complexity
  Codec ID                                 : A_AAC-2
  Duration                                 : 11 h 27 min
  Channel(s)                               : 1 channel
  Channel layout                           : C
  Sampling rate                            : 48.0 kHz
  Frame rate                               : 46.875 FPS (1024 SPF)
  Compression mode                         : Lossy
  Title                                    : simple_aac
  Default                                  : Yes
  Forced                                   : No
  
  ```
  
  as analizing the file by one person is too much, I split in files, with MKVToolNix, and due to creation time, I chose: 01:04:45,04:04:45,07:04:45,10:04:45 (first and last are shorter, other 3 files are 3 hours long). MKVToolNix suposelly split the file WITHOUT recodification.
  
  SURPRISE, output file are 40MB, 3 of 100MB, and last of 45 MB, total 375 MB instead of 12 GB
  
  I got details for the second file:
  
  ```
  General
  Complete name                            : D:\File-002.mkv
  Format                                   : Matroska
  Format version                           : Version 4
  File size                                : 97.8 MiB
  Duration                                 : 3 h 0 min
  Overall bit rate                         : 75.9 kb/s
  Encoded date                             : UTC 2023-02-27 16:15:19
  Writing application                      : mkvmerge v60.0.0 ('Are We Copies?') 64-bit
  Writing library                          : libebml v1.4.2 + libmatroska v1.6.4 / Lavf58.76.100
  
  Video
  ID                                       : 1
  Format                                   : AVC
  Format/Info                              : Advanced Video Codec
  Format profile                           : High@L2
  Format settings                          : CABAC / 4 Ref Frames
  Format settings, CABAC                   : Yes
  Format settings, Reference frames        : 4 frames
  Codec ID                                 : V_MPEG4/ISO/AVC
  Duration                                 : 3 h 0 min
  Bit rate                                 : 1 246 b/s
  Width                                    : 192 pixels
  Height                                   : 108 pixels
  Display aspect ratio                     : 16:9
  Frame rate mode                          : Constant
  Frame rate                               : 10.000 FPS
  Color space                              : YUV
  Chroma subsampling                       : 4:2:0
  Bit depth                                : 8 bits
  Scan type                                : Progressive
  Bits/(Pixel*Frame)                       : 0.006
  Stream size                              : 1.60 MiB (2%)
  Default                                  : Yes
  Forced                                   : No
  Color range                              : Limited
  Color primaries                          : BT.709
  Transfer characteristics                 : BT.709
  Matrix coefficients                      : BT.709
  
  Audio
  ID                                       : 2
  Format                                   : AAC LC
  Format/Info                              : Advanced Audio Codec Low Complexity
  Codec ID                                 : A_AAC-2
  Duration                                 : 3 h 0 min
  Bit rate                                 : 73.5 kb/s
  Channel(s)                               : 1 channel
  Channel layout                           : C
  Sampling rate                            : 48.0 kHz
  Frame rate                               : 46.875 FPS (1024 SPF)
  Compression mode                         : Lossy
  Delay relative to video                  : 5 ms
  Stream size                              : 94.6 MiB (97%)
  Title                                    : simple_aac
  Default                                  : Yes
  Forced                                   : No
  
  ```
  
  Not sure what has happend, why the file stop after 11 hours, why it takes so much space, and why the splited files are much lower size
  
  may somebody help us??
  (we need to repeat the experiment, and we need the recording to last for 72 hours straigh)
  
  **Tags:** audio, video-quality, video-recording, audio-recording, recording
  
  
  ---
  
  ## 1 answers
  
  ### Answer by username_1 on 2023-03-02. Score: 0
  
  Your split files are smaller because they are being recompressed.
  
  The split files have a bit-rate of 75.9 kbps.
  
  The original file had a bit-rate of 7,577 kbps.
  
  Optimise this by deciding what bit-rate you need to record at. This will be a trade off between file size and image quality needed.
  
  Check the amount of free space left on your drive before you record.
  
  Use a [video file size calculator](https://toolstud.io/video/filesize.php?width=1920&height=1080&framerate=25&timeduration=60&timeduration_unit=seconds&compression=19290&specificbitrate=100&specificbitrate_unit=1000000) to work out how much space your recordings will take up.
  
  Bear in mind that other apps and your OS may use some space over time on the drive to swap files etc.
  
  
  ---
  
  