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[Resolved] ffmpeg web video maximum bitrate inconsistency
Posted: Tue Oct 22, 2013 10:10 pm
by Casper
I noticed with ffmpeg web video that the -maxrate parameter doesn't reflect the maximum bandwidth value specified in the UI.
Maximum bandwidth 5Mb/s ---> maxrate 1000000
Maximum bandwidth 10Mb/s ---> maxrate 4000000
Maximum bandwidth 50Mb/s ---> maxrate 24000000
Is this there any logic behind this?
Re: 3.0.0.b1 ffmpeg web video maximum bitrate inconsistency
Posted: Wed Oct 23, 2013 11:01 am
by DeFlanko
Are you using the latest build?
If so and you utilized the Configuration wizard, i would think its because of these settings. (Automatic settings...)
Re: 3.0.0.b1 ffmpeg web video maximum bitrate inconsistency
Posted: Wed Oct 23, 2013 8:41 pm
by Casper
Using the 3.0.0.b1 release, not the latest build.
In my tests maxrate is independent of the transcoding quality.
Re: 3.0.0.b1 ffmpeg web video maximum bitrate inconsistency
Posted: Thu Oct 24, 2013 3:26 am
by ExSport
What I remember the formula is something like:
Code: Select all
(Max_bitrate divided by 2) - Audio_Bitrate
[/size]
Division by 2 is used because UMS caches 2seconds of data and sends it to renderer so sent data are twice the counted bitrate.
Code: Select all
Maximum bandwidth 10Mb/s ---> maxrate 4000000 ----> (4Mbit video + 1Mbit audio) *2 = 10Mbit limit
Maximum bandwidth 50Mb/s ---> maxrate 24000000 ----> (24Mbit video + 1Mbit audio) *2 = 50Mbit limit
Re: [Resolved] ffmpeg web video maximum bitrate inconsistenc
Posted: Sun Oct 27, 2013 6:39 pm
by Casper
Thank you. This explains why I was having problems with
CustomFFmpegOptions.