Jump to content
  • 0

Author 5.1 Surround Blu-Ray?


Glenno

Question

7 answers to this question

Recommended Posts

I'm not quite clear on what an AC3 "elementary stream" is... or how I output that from Final Cut and/or Compressor.

 

Elementary stream means a file with just one kind of data: e.g. just video or just audio. (The terminology comes from the MPEG-2 standard, so a different but similar term may be applicable in a more general discussion.)

.m2v and .mpv would be examples of a file with just MPEG-2 video.

.ac3 would be a file with just AC3/A52/Dolby Digital audio.

.264 would be a file with just H.264 video (maybe other extensions are used as well).

 

http://documentation.apple.com/en/compressor/usermanual/index.html#chapter=18%26section=3%26tasks=true

 

If you add a video-only file to Toast, it should notice that and look for a suitable audio file in the same folder, or ask the user to point to it.

Link to comment
Share on other sites

Thanks again!

 

Cool, looks like it's working so far... I created a 5.1 elementary ac3 stream in Compressor from the 6 audio stems my sound mixer gave me. Attached it to the video stream in Toast, and Toast seems to recognize it as Dolby Digital 5.1 sound.

 

Final questions in Toast:

 

Under Encoding, any idea if can I choose PCM for uncompressed audio, or must I choose Dolby Digital? And should/can I set Reencoding to Never?

Link to comment
Share on other sites

Under Encoding, any idea if can I choose PCM for uncompressed audio, or must I choose Dolby Digital?

Leave it at DD; PCM would not be beneficial with a DD source file.

 

And should/can I set Reencoding to Never?

 

Set Reencoding to Never. This will prevent Toast from re-encoding the streams that are already compliant. Streams that are not compliant will be re-encoded anyway, regardless of this setting.

Link to comment
Share on other sites

Leave it at DD; PCM would not be beneficial with a DD source file.

Okay, thanks, I wasn't sure if there'd be any further compression going on.

 

 

Set Reencoding to Never. This will prevent Toast from re-encoding the streams that are already compliant. Streams that are not compliant will be re-encoded anyway, regardless of this setting.

Lastly: So if Compressor did the audio at 640kbps, but Toast's highest setting is 448, any idea if Toast will still re-encode it at 448?

Link to comment
Share on other sites

Hm. I tried authoring 2 versions, one with the Lt/Rt mix, and one with the full 5.1 mix. The 5.1 Blu-ray definitely sounds better, I'm hearing sounds that are lost in the Lt/Rt mix. Any idea why that might be happening? FWIW, we didn't put anything solely on the surround channels. It may be a flaw in the Lt/Rt mixdown itself.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...