[Martin Rock]

I Have not found the answer … Why Two video formats that are identical in all respects have a different size and bitrate?!

[Martin Rock]

This time, by importing the .m4v and .wav files in Encore, I got a different .m2ts file again.
Encore has transcoded the wav file. I select “don’t transcode” for the .m4v file.

Here’s a comparison:
[1] .m2t file created by Premiere Pro vs [2] .m2ts file created by Encore (by importing .m2t file) vs [3] .m2ts file created by Encore (by importing .m4v and .wav files)

..[1]………………[2]……………..[3]
1.92 GB………1.68 GB……..1.67 GB
00:07:34……..00:07:33…….00:07:33
35885 Kbit/s…31702 Kbit/s..31482 Kbit/s

I use the same transcoding settings for all.
The quality is exactly the same but technically the bitrate are different. That’s the problem. Why?

[Martin Rock]

Thank you Jeff for your concern.

I may have made a mistake with the multi-plexign. I try differently with Premiere Pro. In video, I export the sequence in H264 Blu-ray with full settings; In mutliplexing, I chose “none”; In Audio, I chose PCM (or Dolby Digital?). Then I import the .m4v file and audio in Encore and I select “don’t transcode” and then generates the Blu-ray. I will give you results in 20 minutes.

The problem is that I believe that the quality of the Blu-ray (.m2ts) is less than the original rendering quality even though there was no transcoding.

[Martin Rock]

Yes indeed but only to export the audio and video separately. I selected TS multiplexing leaving the default setting and in audio I selected Dolby Digital and 448 kbit/s. So I get a .M2t file.
For multiplexing, Premiere Pro generates a temporary .M4v, .Ac3 and .Mdo files and then creates a .M2t file.

I tried using Adobe Dynamic Link in Premiere Pro, and after selecting the same transcoding settings of Premiere Pro into Encore (ie H.264 Blu-ray Full 35 Mb/s, 2 passes, maximum render quality, etc.) the ISO file generated is still exactly the same.

I also tried with a lower quality as 20 Mb/s H.264 Blu-ray in Premiere Pro. The M2ts file in the ISO file generated by Encore is always less than the .M2t file (multiplexing) or .M4v file that I got with Premiere Pro with the same settings. Comparison:

.M4v = 1,00 GB ; 00:07:34 ; 18514 Kbit/s
.M2ts = 922 MB ; 00:07:33 ; 16794 Kbit/s

MR.

[Martin Rock]

Hi Jeff,

I use the H264 Blu-ray in Premiere Pro that generate a m2t file. In Encore, I import this file and generate just a blu-ray image file. No transcoding was done (The file was created very quickly but after mounting the file to a virtual drive and going into the folder BDMV STREAM the m2ts video file is different from the original m2t file.

Original M2t vs M2ts :

1.92 GB vs 1.68 GB
00:07:34 vs 00:07:33
35885 Kbit/s vs 31702 Kbit/s

Do you have any idea?

Thx.