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  1. Member
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    I'm looking into Media Composer First mostly for preparing files , but ...Avid needs really big system specs ..

    http://avid.force.com/pkb/articles/en_US/compatibility/en365919?popup=true

    is their any way to transcode my files to AVC long GOP (AVC-Ultra, XAVC, AVC-LG etc..)
    with FFMPEG ? using maybe XVID4PSP's cli ?
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  2. It's not clear what you're trying to do.

    Are you trying to get footage into Avid? Out of it? Or are you just looking to transcode for a different NLE.

    What kind of files are you starting with?

    If you're trying to get footage into Avid, just link to it, then transcode to a lower resolution to edit. Relink to the original sources for output.
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  3. I'm afraid that you started in a wrong way but without details i can't advise anything.
    https://trac.ffmpeg.org/wiki/Encode/H.264 - default GOP in x264 is 250 frames and i not recommend to go over this.
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  4. Member
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    i want to know how to make AVC long GOP file to put into AVID MCF ..
    AVC-LG are the kind of files that needs less system power ..

    what are the specs for Panasonic's AVC longG (XAVC-Ultra for sony)
    seams they are paid codecs and want to emulate them

    i'm not sure but i think it's an intra-frame variant

    linking means transcode? is it cloud based?
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  5. Use DNxHD , it's Avid's preferred format . Way less power to decode than AVC long GOP. It's intra and less compressed, so performance is much faster. But you need lots of HDD space
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    Ok, thanks i'll look into that ...with xmediarecode i can do DNxHD with a .dnxhd extention.. is that ok?
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  7. dnxhd proper extension should be mov or mxf
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  8. Member
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    i think that .mov in mediacomposer are only supported under mac so i'll try .mxf thanx
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  9. Member
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    found this .. http://www.brorsoft.com/how-to/convert-mxf-to-avid.html
    don't know what it's worth..

    i'll stick with xmediarecode ...thank you all
    Last edited by smartel; 11th Nov 2017 at 17:18.
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  10. Member
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    no 4:3 aspect ratio!, only 16:9 for this codec??
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  11. What specs are your source files ?

    Anyways, long GOP AVC is one of the worst intermediate for editing, in terms of resource consumption / decoding speed - because of temporal compression. If you're looking for low resource / easy editing, you want an I-frame format. Even AVC I-frame is better than long GOP AVC . You can use fast decode settings
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  12. As I said earlier, to get AVCHD into Avid, just LINK to it, then transcode to a lower resolution to edit (I use DNxHR at 1/4 resolution 960x540). After editing, relink your sequence to the original sources, mixdown your timeline to DNxHD115 or higher, and output a quicktime reference for final encoding.

    You do not need to be on a mac to use mov files in Avid. It will even handle Pro-Res quicktimes.
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  13. Member Cornucopia's Avatar
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    Originally Posted by smartel View Post
    no 4:3 aspect ratio!, only 16:9 for this codec??
    For HD/UHD material? Of course!
    Those formats are only expecting 16:9 frame size ratios.

    Scott
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  14. Originally Posted by smartel View Post
    i want to know how to make AVC long GOP file to put into AVID MCF ..
    AVC-LG are the kind of files that needs less system power ..
    I''m afraid you getting it wrong - GOP require higher power (maybe only computational due higher complexity of GOP structure, you may save slightly on HDD power - not sure on this - seek can be also involved in this) - normally for editing Intra coding is used as it gives unrestricted (and quick) access to edited material - GOP is used when bitrate reduction is your goal and you accepting small performance loss - for GOP especially long sometimes decoder need to decode ALL frames between current frame and preceding/following Intra.
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    my original question was based on their suggested specificatiom based on codecs (provided in post#1)

    i tried dv-avi and MCF eats up all my ram (12G) and i have to shut down windows services and programs to let it run and it finishes without any output

    i have a SSD drive so i don't have any pagefile ..all of my program are on my 2nd drive
    i could put my source on my SSD, that could be an option

    my first file is a .ASF that i want to stabilize,i can't have black borders
    i want to know how media composer works it.

    Complete name : E:\ASF\FNM_Jam06.ASF
    Format : Windows Media
    File size : 616 MiB
    Duration : 24 min 12 s
    Overall bit rate : 3 559 kb/s
    Maximum Overall bit rate : 3 731 kb/s
    Encoded date : UTC 2017-11-03 11:30:33.490

    Video
    ID : 1
    Format : MPEG-4 Visual
    Codec ID : M4S2
    Codec ID/Hint : Microsoft
    Description of the codec : mpeg4z
    Duration : 24 min 12 s
    Bit rate : 3 365 kb/s
    Width : 640 pixels
    Height : 480 pixels
    Display aspect ratio : 4:3
    Frame rate : 30.000 FPS
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Compression mode : Lossy
    Bits/(Pixel*Frame) : 0.365
    Stream size : 583 MiB (95%)
    NumberOfFrames : 43556

    Audio
    ID : 2
    Format : ADPCM
    Codec ID : 2
    Description of the codec : adpcm_ms
    Duration : 24 min 12 s
    Bit rate : 44.1 kb/s
    Channel(s) : 1 channel
    Sampling rate : 11.025 kHz
    Bit depth : 4 bits
    Stream size : 7.64 MiB (1%)

    my 2nd file is a bad DV to dvd recorder transfert, i want to correct it's 7.5/100 IRE balance.

    General
    Complete name : E:\DVD_VIDEO_RECORDER\DVD_RECORDER.mpg
    Format : MPEG-PS
    File size : 1.35 GiB
    Duration : 20 min 11 s
    Overall bit rate mode : Variable
    Overall bit rate : 9 540 kb/s

    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=15
    Format settings, picture structure : Frame
    Duration : 20 min 11 s
    Bit rate mode : Variable
    Bit rate : 9 094 kb/s
    Maximum bit rate : 9 586 kb/s
    Width : 704 pixels
    Height : 480 pixels
    Display aspect ratio : 4:3
    Frame rate : 29.970 (30000/1001) FPS
    Standard : NTSC
    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) : 0.898
    Time code of first frame : 00:00:00:00
    Time code source : Group of pictures header
    Stream size : 1.28 GiB (95%)
    Color primaries : BT.601 NTSC
    Transfer characteristics : BT.601
    Matrix coefficients : BT.601

    Audio
    ID : 189 (0xBD)-128 (0x80)
    Format : AC-3
    Format/Info : Audio Coding 3
    Format settings, Endianness : Big
    Muxing mode : DVD-Video
    Duration : 20 min 11 s
    Bit rate mode : Constant
    Bit rate : 256 kb/s
    Channel(s) : 2 channels
    Channel positions : Front: L R
    Sampling rate : 48.0 kHz
    Frame rate : 31.250 FPS (1536 SPF)
    Bit depth : 16 bits
    Compression mode : Lossy
    Stream size : 37.0 MiB (3%)
    Service kind : Complete Main

    At the end , my projet will be a 2 cam edit at 640x480 (square pixel) for youtube probably done with Kdenlive
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  16. Originally Posted by smartel View Post

    i tried dv-avi and MCF eats up all my ram (12G) and i have to shut down windows services and programs to let it run and it finishes without any output
    Something is definitely wrong if DV-AVI eats up 12GB in any program. Bad memory leak
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  17. Member
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    my PC is brand new ..about 3 months .. i'll run a memory test
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  18. Member
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    my PC is brand new ..about 3 months .. i'll run a memory test

    ok i ran mdsched.exe and no memory problems
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  19. DV requires a 720x480 frame size at 29.97 fps. Or 720x576 as 25 fps.
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  20. Originally Posted by smartel View Post
    i want to correct it's 7.5/100 IRE balance.
    Are you sure? 7.5IRE pedestal shall be not present in digital video at all (sampled video data) - it is created in NTSC video encoder and removed by NTSC video decoder - all digital video shall be uniformly quantized within 0 and 100IRE - NTSC decoder will take such digital samples and squeeze losslessly (in most of cases video DAC is more than 8 bit) to analogue signal 7.5 and 100% IRE.
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  21. Member
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    was thinking that 16-235 was 7.5-100IRE and 0-255 was 0-110?(or 120?) IRE, That DV was 7.5-100

    does colormatrix() or tone down the brightness and contrast in avisynth cure this? i'm a littre confused ..
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  22. NTSC setup is only an analog issue. In digital video IRE=0 is Y=16, and IRE 100 is Y=235. But for some reason, it's very common for DV camcorders to shoot Y~=32 to Y~=255 (mine used to do this). So pulling Y down by ~16 units usually gets the video into more legal levels.
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  23. Try to encode videos into DNxHD codec which is more compatible with Avid.
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