1

convert command like this:

ffmpeg -i res.ogv -vcodec libx264 -vb 2000k -preset ultrafast -f mp4 res.ogv.mp4

with ffmpeg version 2.8.10 from Fedora 23 it generates file:

  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.40.101
  Duration: 00:04:30.98, start: 0.000000, bitrate: 1579 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1104x848 [SAR 1:1 DAR 69:53], 1577 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : VideoHandler

And this file is compatible with Firefox 15.0.1 (released August 28, 2012) in HTML tag "video" or with even early versions (not tested by me), so this file most possibly will be readed by more\most browsers\players etc.

with ffmpeg version 4.1.5 from Fedora 30 it generates file:

  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.20.100
  Duration: 00:04:30.98, start: 0.000000, bitrate: 1579 kb/s
    Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1104x848 [SAR 1:1 DAR 69:53], 1577 kb/s, 60 fps, 60 tbr, 15360 tbn, 120 tbc (default)
    Metadata:
      handler_name    : Video Media Handler

This file works only with most recent browsers (Firefox 28.0 released Mar 18, 2014) in HTML tag "video".

The difference only in:

encoder : Lavf56.40.101 and encoder : Lavf58.20.100

How to emulate ffmpeg version 2.8.10 behaviour from Fedora 23 in Fedora 30 with ver 4.1.5?

I need it for more compatibility.

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