[Resolved] ffmpeg web video maximum bitrate inconsistency

[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?

[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...)

[Casper]

Using the 3.0.0.b1 release, not the latest build.

In my tests maxrate is independent of the transcoding quality.

[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

[Casper]

Thank you. This explains why I was having problems with CustomFFmpegOptions.