• Compression Techniques

  MainConcept H.264 frame rate issues with Final Cut output

  Posted by Tony Mugavero on January 26, 2010 at 3:37 pm

  Hello, first time poster hoping the vast knowledge here can point me in the right direction 🙂

  I am using MainConcept Reference to encode a file output from Final Cut using its QuickTime Exporter (It’s a friend’s file). The frame rate on the input file is showing “Variable”, with the lowest fps at .003 and the highest at 29.97 for an overall framerate of 0.978 fps. MediaInfo says the video portion is ~5min but the audio portion says it’s 10sec (which it should be).

  This file plays perfectly in QuickTime, but when I encode it with MainConcept to H.264/AAC, it comes out as a 5min file with the video slowed waaaay down. If I take the file into QuickTime Pro and re-export with the same settings (essentially washing the file I guess), then use that file in MainConcept, it encodes perfectly.

  I have tried all variations in the H.264 codec settings and have been unable to get the frame rate to come out right. Has anyone experienced a similar issue, or know of a way to get MainConcept Reference to handle Variable frame rate inputs?

  Here is the MediaInfo output of the source file from FinalCut (pre MainConcept Reference)

  Format : MPEG-4
  Format profile : QuickTime
  Codec ID : qt
  File size : 32.7 MiB
  Duration : 5mn 15s
  Overall bit rate : 870 Kbps
  Encoded date : UTC 2009-10-07 02:52:37
  Tagged date : UTC 2009-10-07 02:52:39
  Writing library : Apple QuickTime

  Video
  ID : 2
  Format : AVC
  Format/Info : Advanced Video Codec
  Format profile : Main@L4.1
  Format settings, CABAC : No
  Format settings, ReFrames : 2 frames
  Codec ID : avc1
  Codec ID/Info : Advanced Video Coding
  Duration : 5mn 15s
  Bit rate mode : Variable
  Bit rate : 820 Kbps
  Width : 1 440 pixels
  Height : 1 080 pixels
  Display aspect ratio : 16:9
  Original display aspect ratio : 4:3
  Frame rate mode : Variable
  Frame rate : 0.978 fps
  Minimum frame rate : 0.003 fps
  Maximum frame rate : 29.970 fps
  Resolution : 24 bits
  Colorimetry : 4:2:0
  Scan type : Progressive
  Bits/(Pixel*Frame) : 0.539
  Stream size : 30.8 MiB (94%)
  Language : English
  Encoded date : UTC 2009-10-07 02:52:36
  Tagged date : UTC 2009-10-07 02:52:39
  Color primaries : BT.709-5, BT.1361, IEC 61966-2-4, SMPTE RP177
  Transfer characteristics : BT.709-5, BT.1361
  Matrix coefficients : BT.709-5, BT.1361, IEC 61966-2-4 709, SMPTE RP177

  Audio
  ID : 1
  Format : PCM
  Format settings, Endianness : Little
  Format settings, Sign : Signed
  Codec ID : sowt
  Duration : 10s 276ms
  Bit rate mode : Constant
  Bit rate : 1 536 Kbps
  Channel(s) : 2 channels
  Sampling rate : 48.0 KHz
  Resolution : 16 bits
  Stream size : 1.88 MiB (6%)
  Language : English
  Encoded date : UTC 2009-10-07 02:52:36
  Tagged date : UTC 2009-10-07 02:52:39

  Daniel Low replied 16 years, 3 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Daniel Low

  January 26, 2010 at 11:37 pm

  As you’ve figured out, your source file is screwed up.

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