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I recorded a zoom meeting (saved as .mp4) and made a few trivial changes with OpenShot (trimmed a few seconds from start and finish, and added image at the beginning). Then exported the video trying to mimic settings of original video in order to keep size as small as possible. Below are the details of the original file (output of ffprobe zoom.mp4 in Ubuntu terminal):

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2021-03-29T13:08:39.000000Z
  Duration: 01:14:01.60, start: 0.000000, bitrate: 196 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 126 kb/s (default)
    Metadata:
      creation_time   : 2021-03-29T13:08:39.000000Z
      handler_name    : AAC audio
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 68 kb/s, 25 fps, 25 tbr, 30k tbn, 60k tbc (default)
    Metadata:
      creation_time   : 2021-03-29T13:08:39.000000Z
      handler_name    : H.264/AVC video
      encoder         : AVC Coding

Below are the details of the output file (output of ffprobe my_video.mp4 in terminal):

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video (2021).mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 01:13:35.72, start: 0.033008, bitrate: 241 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720, 70 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 163 kb/s (default)
    Metadata:
      handler_name    : SoundHandler

As you can see, I tried to keep to the original resolution, bitrate and fps (1280x720, 70 vs 68 kb/s and 30 vs 25 fps). However, whereas the original zoom video looks fine, the edited one looks terrible:

enter image description here

When exporting in OpenShot, I selected advanced and changed the bitrate. Rest was as default.

enter image description here

If I add more bitrate, size file increases dramatically. If zoom can produce a small video of a decent quality, I don't understand why, with the same settings, OpenShot cannot produce it also. What am I doing wrong?

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  • Anyway, after reading many posts complaining about huge file sizes with OpenShot and not been able to solve my problem, moved on to Shortcut. First export with default settings (which seem imported from input file) solved the problem of file size.
    – ayowayoyo
    Mar 30 at 18:10

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