• | I-Frame only on XDCAMHD
on Sep 12, 2017 at 4:07:33 pm |
Hey guys
Hoping I'm posting in the right forum...
I'm trying to export an advert for UK TV.
They're specifications are:
Codec: MPEG-2
Container: OP1a
Profile / Level: MPEG-2 4:2:2 / High
Video: 100Mb/s
Audio: PCM 2ch 48kHz 24bit
GOP Structure: I Frame only
Upper Field First
Chroma: 422
Framerate: 25fps
Dimensions: 1920x1080px
File Extension: .mxf
I am using the XDCAMHD50 PAL (4:2:2) which I think is right, but when supplied it failed because it was "long-GOP" and it needs to be "I-Frame"
In this Codecs settings in Adobe Media Encoder under Advanced XDCAM Settings there are two check boxes:
Force Fixed-length GOPs
Force Closed GOPs
Does anyone would know if having any of these checked would turn it to "I-Frame"
And could anyone explain what they mean?
Thanks a lot!
James
• | Re: I-Frame only on XDCAMHD on Sep 13, 2017 at 7:26:17 am |
gop length is from I frame to I frame so if that is 1. it should be all i frames (fastest editing)
closed is not using adjacent b frames.(somewhat fast editing)
i would select both and then test with ffmpeg's ffprobe
ffprobe -show_frames videofilename.mp4 > outputfile.txt
Then you just look for the pict_type entries, which will be either I, P, or B. B denotes a b-frame.
