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HarpuaFSB
HarpuaFSB
Participating Frequently
January 4, 2012
Question

Encore insists on transcoding H.264 Blu-ray encoded file (Blu-ray legal)

  • January 4, 2012
  • 2 replies
  • 25684 views

I have a Blu-ray legal .m4v file encoded out of Adobe Media Encoder as H.264 Blu-ray VBR 2-Pass, maximum render, target 25Mbps, maximum 30Mbps.

My project is H.264, maximum 40Mbps.

Encore keeps listing the video file as untranscoded and wants to transcode it.

I've tried encoding just a portion of the video file instead of the whole thing using the same settings and when I bring this into Encore it recognizes it as Blu-ray legal and sets it to "Don't Transcode".

Can anyone think of a reason as to why this is happening?  I really don't want to sit through another eight hour encode that could degregade pq further.

Thanks!

This topic has been closed for replies.

2 replies

N
nordental
Participating Frequently
February 9, 2013

I have a similar problem:

Win7/64, Encore CS6.

Imported file: .h264 (encoded with MainConcept), CBR, 34.99Mbps. Length: 6min.

Preferences in Encore: BluRay, h264, CBR, max. 40Mbps, Main 4.1. (MainConcept Codec is shown on the display.)

- After import Encore want to transcode the file.

- "For fun" I let Encore do the transcoding procedure. It took one hour...

- The result: The "old" file (.h264) is 1.494.861 kb. The transcoded file (Encore made a m4v) is 1.494.966 kb. Why is the new file bigger than the old?

- Another attempt: I renamed the "old" file from ".h264" into "m4v". No cahnge to Encore - Encore wants to transcode as before.

Any ideas or solutions?

Stan Jones
Community Expert
Stan JonesCommunity Expert
Community Expert
February 9, 2013

While your problem fits the general topic of this thread, it is otherwise different. The H264 2 pass bug was fixed with CS6 (it was CS6 and not an update, right?). Also, you are exporting CBR.

You have a project max of 40Mbps (which is video and audio combined), with CBR fairly high. Any spikes and  your file will not be compliant.

Does anyone have a better bitrate viewer than "Bitrate Viewer"?

http://www.videohelp.com/tools/Bitrate-Viewer-2

Jeff Bellune
Jeff Bellune
Legend
February 9, 2013

I think that is the problem: .264.


A .264 file from x264Pro or MeGUI that is BD-legal will import into En and be automatically set to Do Not Transcode.  So the file extension isn't the problem.  There are some esoteric H.264 parameters in x264 that must be set precisely in order to have En set the .264 file to DNT.  I suspect those same parameters will have to be set in MainConcept's encoder.

If you want to jump in the deep end, here are the x264 parameters that produce BD-legal output that also make En happy:

program --pass 2 --bitrate 16000 --stats ".stats" --open-gop bluray --interlaced --pic-struct --level 4.1 --bframes 3 --ref 4 --slices 4 --aud --nal-hrd vbr --b-pyramid strict --keyint 30 --min-keyint 3 --vbv-bufsize 30000 --vbv-maxrate 40000 --weightp 0 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --output "output" "input"

Obviously interlacing, bitrate, vbv-maxrate and such can be set as desired based on the source footage and delivery requirements.

Jeff

E
excited_Genie16B8
Legend
January 7, 2012

Be sure you're looking at the Blu-ray info.  A lot of folks have made the mistake of looking at the DVD transcode status.

    Stan Jones
    Community Expert
    Stan JonesCommunity Expert
    Community Expert
    January 7, 2012

    If you are not looking at the wrong info, this may be a bug related to 2 pass vbr H264.

    http://forums.adobe.com/message/3876184

    See post 20 here, where Jeff (I think) is suggesting that this may not be a single 2 pass vbr bug, but a relationship between the profile also.

    http://forums.adobe.com/thread/697684

    HarpuaFSB
    HarpuaFSBAuthor
    Participating Frequently
    January 8, 2012

    Definitely looking at Blu-ray info, not DVD and almost positive it's the VBR 2-Pass H.264 bug discussed elsewhere.  Encoded using VBR 1-Pass and Encore accepts the clip no problem.

    Also heard that this has been a bug since CS4?  That's crazy.

    (also submitted my own bug report)

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