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Sorenson Squeeze problem

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Sean Emer
Sorenson Squeeze problem
on May 7, 2006 at 6:16:39 pm

I need to get a recently edited show to DVD. My standard procedure for doing this has been exporting as a quicktime reference file from Avid Xpress Pro, compressing to mpv/mpg format, and then burning to disc using DVDit!. There seems to be a problem, however, with my compression stage. I use Sorenson Squeeze 3.5 for compressing, and up until now it has always worked flawlessly. Here's the problem: About 1/8th of the way into the compression (always in the same spot on the video), sorenson stops compressing and gives me an error message that says:

The movie file '"' cannot be found. Without this file, the movie cannot play properly

I have two buttosn to press: Cancel or Search. I hit search and it brings up a browser for me to find the movie named " and obvioudly that doesn't exist. so I have to hit cancel. When I do THAT, I get:

Unable to read the audio data. To compress this file you must turn off audio.


So...
Here is my compression setup:

Elementary
Video: MPEG-2
3000 Kb/s
NTSC
29.97 fps
Constant Bit Rate
720x480
I Frame Rate: 6

PCM Audio
1536 Kb/s
48.000 kHz
Stereo



Normally I would use 6500 kb/s instead of 3000, but the show is an hour and 50 minutes long, so I'm trying to conserve space. I did try compressing on 6500 kb/s to see if it helped, but I still got the error. Does anybody know what might be going wrong here? I'm on a deadline.


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cow
Rich Rubasch
Re: Sorenson Squeeze problem
on May 7, 2006 at 6:28:28 pm

These big reference files are convenient to a point...if it's short and has few layers. Lots of things can clog the reading of a ref clip during compression. There is a ton of seeking around to put the pieces of the ref clip back together for the encoder. Usually, on a length more than 20 minutes or so you are better off ouptting the program to tape and redigitizing from the master to a single file. A reference clip from that new digitized clip will make it thgought the encoder much easier.

A real pain in the keester when your show is amost 2 hours...that's 2 hours to tape and 2 hours back in, but you will not have those problems with the encoder.

Another option is to save out of AVID to a compressed codec of some sort to a self contained clip (still quite large) and run that clip through the encoder.

If you will be making these DVDs from long program material on a regular basis, the I recommend one of the PCI card realtime encoders from Wired or other...some of the cheaper PC video cards support realtime MPEG2 encoding from your master tape. I would find one of those...chances are you will make a tape master anyway, so after you make it just send it through the encoder realtime and 2 hours later you have your MPEG2.

But big ref clips from a long, multi-layered program are a bear.

One last thought...have you done a mixdown of the video tracks? In the AVID I used to do a mixdown to two new tracks and then delete all the other audio, this made for a neater ref clip.

Rich Rubasch
Tilt Media


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cow
Sean Emer
Re: Sorenson Squeeze problem
on May 7, 2006 at 11:33:53 pm

I've already put the show to master and brought it over to a new system. I recorded into avid from a DSR-45, and then exported as quicktime reference.

I got the video to compress fine by turning off the audio output. Now when I compress my audio file (it was exported from avid as .aif), I get the same error. I don't know why a simple audio file (only two tracks) could create this kind of problem. Should I try exporting the audio as some other filetype? Would lowering the bitrate work?

Thanks for the help!


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cow
Rich Rubasch
Re: Sorenson Squeeze problem
on May 8, 2006 at 1:27:08 am

That is strange...you get the same error with the audio file? What is the audio's sample rate and what are you encoding it to?

Rich


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Craig Seeman
Re: Sorenson Squeeze problem
on May 8, 2006 at 2:36:38 am

Although I'm a Mac person I've heard of similar issues on Avid/Mac side and Squeeze. Have you tried saving as a self contained movie (not reference)?

Is it possible you can save in a non Avid proprietary codec? On the Mac side, saving to Apple's DV mov rather than Avid's, has solved issues similar to this.


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Sean Emer
Re: Sorenson Squeeze problem
on May 8, 2006 at 3:14:34 am

alright, I have it working now. I am encoding as PCM Audio at 1536 kb/s (same as before). All I did however was re-export from avid without selecting video tracks. I'm not sure what this did differently since the audio was already a seperate file, but Sorenson is compressing it perfectly now. I have the DVD made, and all is well. Thanks again for the help guys! Long live the Cow!


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cow
Craig Seeman
Re: Sorenson Squeeze problem
on May 8, 2006 at 3:22:07 am

Maybe post a step by step for what you did that worked. I think others have bumped into similar issues with Avid export for compression so a step by step might be a great help.

BTW, If you encode audio AC3 (192kbps for example) instead of PCM you'll get a good but much smaller audio file, which can give you more room to push up the data rate for the video MPEG2 file.


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