• Apple Final Cut Pro Legacy

  Variable bitrate and different fps settings

  Posted by Joshua Boswell on April 29, 2015 at 10:47 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

  Joshua Boswell replied 11 years, 4 months ago 1 Member · 0 Replies
• 0 Replies

Reply to this Discussion! Login or Sign Up