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Variable bitrate and different fps settings

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Joshua Boswell
Variable bitrate and different fps settings
on Apr 29, 2015 at 10:47:33 am

I have a very bizarre question.

I have two iMacs, both running the exact same version of FCP X and Compressor 4 (I did a clean install to make sure... including cleaning out preference files, etc...), using the exact same settings.

When I export video on the one iMac (Mid-2010, 2.93, i7), it gives me beautiful files and all the settings are right.

When I export video on the other, it changes two critical things... specifically the bitrate and the fps settings.

Using, MediaInfo, I pulled the Metadata for both exports. Notice that in the "good export' the fps only has one setting: 29.97

Then notice that the bad file has two fps settings... 29.97 and 25.0

Also notice that under General, with the good export, it shows "overall bitrate", but with the bad file, it shows "bitrate mode: variable"

I have checked and double checked all my settings. To me all settings in FCP and Compressor on both of these computers are EXACTLY the same.

I'm wondering if the graphics cards is changing this? Or could it be a setting somewhere else?

It is really bizarre to me.

Any ideas?

***********Good Export**********

General
Complete name : /Volumes/My Book/Test Run/JBP-Week-Zero-Welcome-1.a.ii-TEST.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 92.6 MiB
Duration : 8mn 16s
Overall bit rate : 1 563 Kbps
Movie name : JBP-Week-Zero-Welcome-1.a.ii
Encoded date : UTC 2015-04-29 01:18:00
Tagged date : UTC 2015-04-29 01:28:29
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=2, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 16s
Bit rate : 1 493 Kbps
Width : 640 pixels
Height : 360 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.216
Stream size : 88.5 MiB (96%)
Title : Core Media Video
Encoded date : UTC 2015-04-29 01:18:00
Tagged date : UTC 2015-04-29 01:28:29
Color range : Limited
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 8mn 16s
Source duration : 8mn 16s
Bit rate mode : Constant
Bit rate : 64.0 Kbps
Channel(s) : 2 channels
Channel(s)_Original : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 3.86 MiB (4%)
Source stream size : 3.86 MiB (4%)
Title : Core Media Audio
Language : English
Encoded date : UTC 2015-04-29 01:18:00
Tagged date : UTC 2015-04-29 01:28:29

*******************Bad Export**********

General
Complete name : /Users/jtboswell/Downloads/JBP-Week-Zero-Welcome-1.a.ii-TEST.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 76.6 MiB
Duration : 8mn 14s
Overall bit rate mode : Variable
Overall bit rate : 1 300 Kbps
Movie name : JBP-Week-Zero-Welcome-1.a.ii
Encoded date : UTC 2015-04-28 22:08:37
Tagged date : UTC 2015-04-28 22:09:55
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L3.1
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=2, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 14s
Bit rate mode : Variable
Bit rate : 1 197 Kbps
Maximum bit rate : 768 Kbps
Width : 854 pixels
Height : 480 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Original frame rate : 25.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.097
Stream size : 70.5 MiB (92%)
Title : Core Media Video
Encoded date : UTC 2015-04-28 22:08:37
Tagged date : UTC 2015-04-28 22:09:55
Color range : Limited
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 8mn 14s
Source duration : 8mn 14s
Bit rate mode : Constant
Bit rate : 96.0 Kbps
Channel(s) : 2 channels
Channel(s)_Original : 1 channel
Channel positions : Front: C
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 5.77 MiB (8%)
Source stream size : 5.77 MiB (8%)
Title : Core Media Audio
Language : English
Encoded date : UTC 2015-04-28 22:08:37
Tagged date : UTC 2015-04-28 22:09:55


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Dave LaRonde
Re: Variable bitrate and different fps settings
on Apr 29, 2015 at 3:47:52 pm

I think the first thing you ought to do is scrutinize the frame rates throughout the bad clip project & associated applications. I'm pretty sure you'll find a frame rate mismatch someplace along the way.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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