VideoHelp Forum

Try DVDFab and copy Ultra HD Blu-rays and DVDs! Or rip iTunes movies and music! Download free trial !
+ Reply to Thread
Results 1 to 4 of 4
Thread
  1. Member
    Join Date
    Mar 2011
    Location
    Paris, France
    Search PM
    Hello

    I'm trying to learn LightWorks, but it appears to only accept files that use a constant frame rate, while my Sony camcorder uses CFR for audio while it uses VFR for video:
    Code:
    Format                                   : MPEG-PS
    File size                                : 39.7 MiB
    Duration                                 : 37s 920ms
    Overall bit rate mode                    : Variable
    Overall bit rate                         : 8 780 Kbps
    
    Video
    ID                                       : 224 (0xE0)
    Format                                   : MPEG Video
    Format version                           : Version 2
    Format profile                           : Main@Main
    Format settings, BVOP                    : Yes
    Format settings, Matrix                  : Custom
    Format settings, GOP                     : M=3, N=12
    Format settings, picture structure       : Frame
    Duration                                 : 37s 920ms
    Bit rate mode                            : Variable
    Bit rate                                 : 8 157 Kbps
    Maximum bit rate                         : 9 100 Kbps
    Width                                    : 720 pixels
    Height                                   : 576 pixels
    Display aspect ratio                     : 16:9
    Frame rate                               : 25.000 fps
    Standard                                 : PAL
    Color space                              : YUV
    Chroma subsampling                       : 4:2:0
    Bit depth                                : 8 bits
    Scan type                                : Interlaced
    Scan order                               : Top Field First
    Compression mode                         : Lossy
    Bits/(Pixel*Frame)                       : 0.787
    Time code of first frame                 : 00:00:00:00
    Time code source                         : Group of pictures header
    GOP, Open/Closed                         : Closed
    Stream size                              : 36.9 MiB (93%)
    
    Audio
    ID                                       : 189 (0xBD)-128 (0x80)
    Format                                   : AC-3
    Format/Info                              : Audio Coding 3
    Mode extension                           : CM (complete main)
    Format settings, Endianness              : Big
    Muxing mode                              : DVD-Video
    Duration                                 : 37s 888ms
    Bit rate mode                            : Constant
    Bit rate                                 : 448 Kbps
    Channel(s)                               : 6 channels
    Channel positions                        : Front: L C R, Side: L R, LFE
    Sampling rate                            : 48.0 KHz
    Frame rate                               : 31.250 fps (1536 spf)
    Compression mode                         : Lossy
    Stream size                              : 2.02 MiB (5%)
    Do I have to re-encode the video stream before being able to edit the file in LW, or is there a faster, lossless work-around?

    Thank you.
    Quote Quote  
  2. It is CFR (constant frame rate) already

    The bitrate is variable (VBR, variable bit rate)
    Quote Quote  
  3. Your video is ordinary CFR (25fps) PAL mpeg2 video. Haven't used LW in a while, at the time it did not support DVD standard video natively. Does it now? Lightworks may also be having a problem with your 5.1 audio track.
    Quote Quote  
  4. Member
    Join Date
    Mar 2011
    Location
    Paris, France
    Search PM
    The frame rate is constant, but the bit rate is variable, so audio and video are out of sync when playing a video after importing it in LW:

    "You've got a variable frame rate, which means you'll lose sync. You need to convert your media to a constant frame rate codec before importing into Lightworks." https://www.lwks.com/index.php?option=com_kunena&func=view&catid=14&id=105599&Itemid=81
    Quote Quote  



Similar Threads