MPEG2 Compression Settings in Compressor

[Rafael Amador]

Hi Bob,
You need to duplicate the Preset, then you can modify it with your specs.
Rafael

http://www.nagavideo.com

[Bob Cole]

Thanks Rafael. I’d seen that before but I’d completely forgotten. Three remaining issues, perhaps non-issues:

Audio bit rate; recommended is 384 kbps, but I can’t find any reference to audio data rate inside Compressor’s MPEG2 settings or FCP. Probably not a big deal.

I can’t hear any audio when I try to play the MPEG2 files in FCP. Is that anything to be concerned about? (I can hear the audio when I use Quicktime Player & MPEG Streamclip.)

GOP Pattern: I can find something close in Compressor but it isn’t identical to the specs.
Specs: IPBBPBBPBP …/15
Compressor (closest is GOP Structure IBBP: Closed): IBBPBBPBBPBBPBP

Am I making a mountain out of a molehill here?

Bob C

[Rafael Amador]

[Bob Cole] “Audio bit rate; recommended is 384 kbps, but I can’t find any reference to audio data rate inside Compressor’s MPEG2 settings or FCP. Probably not a big deal. “
Right. In Compressor you can not set the audio data-rate when you use MP2 audio.
I think the default data-rate is around 224 Kbps.
You have an easy solution: ffmpegX.
You can make your .m2v in Compressor and your MP2 audio in ffmpegx. Thene you just need to mux them with ffmpegX.

[Bob Cole] “I can’t hear any audio when I try to play the MPEG2 files in FCP. Is that anything to be concerned about? (I can hear the audio when I use Quicktime Player & MPEG Streamclip.) “
FC works with QT movies. MPEGs are not. FC can play some flavors, but can not with some others.
Try to play it with DVDSTP.

[Bob Cole] “GOP Pattern: I can find something close in Compressor but it isn’t identical to the specs.
Specs: IPBBPBBPBP …/15
Compressor (closest is GOP Structure IBBP: Closed): IBBPBBPBBPBBPBP “
The GOPs patterns are different.
But there is something that I don’t like in the structure they ask you.
I think that a Closed/long GOP structure should start with an “I” frame fallowed by an “B” frame instead of a “P” frame.
Rafael

http://www.nagavideo.com

[Tom Graney]

hey david,
i was having the same issues as far as getting a full either 720x 480 or 720×486 mpeg2 program stream. did you actually find a wayto alter the settings in compressor?

I am cutting footage from a sony EX3 720 60P and delivering in SD

[Martin Luknar]

Hello guys,

you both don’t need to use workflow through the FfmpegX… First of all – default bitrate for MP2 Audio in Compressor 3 is 384kbps, but this can be changed in custom profile settings. I do not know why Apple still haven’t implemented the option to change the bitrate in Compressor’s GUI, so you have to change it through the profile’s file.

In your directory /user/Library/Application Support/Compressor/ there are custom profiles as .setting files. Simply open it in Textedit and change the following setting to whatever you need.

Martin Luknar

IT and mastering specialist
Vertexcreation

[Martin Luknar]

Somehow it won’t let me to post the code <data-rate>224000</data-rate>

Martin Luknar

IT and mastering specialist
Vertexcreation