AVC long GOP, media composer first and FFMPEG

[smartel]

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 ?

[smrpix]

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.

[pandy]

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.

[smartel]

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?

[poisondeathray]

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

[smartel]

Ok, thanks i'll look into that ...with xmediarecode i can do DNxHD with a .dnxhd extention.. is that ok?

[poisondeathray]

dnxhd proper extension should be mov or mxf

[smartel]

i think that .mov in mediacomposer are only supported under mac so i'll try .mxf thanx

[smartel]

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

[smartel]

no 4:3 aspect ratio!, only 16:9 for this codec??

[poisondeathray]

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

[smrpix]

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.

[Cornucopia]

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

[pandy]

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.

[smartel]

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

[poisondeathray]

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

[smartel]

my PC is brand new ..about 3 months .. i'll run a memory test

[smartel]

my PC is brand new ..about 3 months .. i'll run a memory test

ok i ran mdsched.exe and no memory problems

[jagabo]

DV requires a 720x480 frame size at 29.97 fps. Or 720x576 as 25 fps.

[pandy]

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.

[smartel]

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 ..

[jagabo]

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.