AVCHD to DVCProHD Transcoding and rendering

sewolla

Well-known member
JUst got my HMC150 a couple weeks ago, and have only had time to shoot a few events. Last night I started editing them, and what a shock that was....I knew that file sizes would be very large following this process of transcoding first to DVCProHD, but what I am seeing borders on the truly insane. I hope that it is due to my error somewhere, and am hoping that you can tell me if thi is really typical of what I can expectusing the transcoding process and the software to do that with, downloaded fromn the Panasonic site.

My computer is a Sony VAIO, configured as follows:

Intel Pentium D-940 processor Dual Core
2GB 533 mhz 533 DDR RAM
Nvidia 7600GeForce video card with 250 MB RAM

I transcoded a soccer game of my daughter's that I shot at 720/60p. total time was 1 hour, in 10 clips. Transcoding took 3.5 hours. I created a project file for it and imported it into Premiere Pro CS3, and noticed that its file size was 55GB. That is kind of what I had expected, figuring that DVCProHD requires about a GB per minute, so no surprise there.

But after I put it on the time line a red line appreared over the clips, and they would not play back smoothly. No big deal. Just render it and everything will be fine.

Well in this case "fine" is a relative term. So far the rendering process is indicating a 12 hour lead time. But my computer is older, I can accept that, somewhat.

But what has me really concerned, is that the file size after rendering it out but prior to doing anything else such as titles, transitions, effects, sound, etc.....is exceeding 100GB for an hour of video!!! I have never sen anything like that before.

I can understand the time required as I have a year and a half old machine....but the file size issue--if this process really does require roughly 1.6 GB's per minute of video--makes this camera not useable for any projects of any real length, as after backup, it requires 200GB's PER HOUR!!! This spoils its use for projects requiring long recording times.

The same file in HDV requires about half that.

Are theses results typical, or am I doing something wrong? I thought after talking with people at DV Expo and raeding up about it online that I had a good understanding of what this cam would need in terms of computing power and file sizes. Was I really that far off, or am I doing something wrong?

I thought that transcoding and using about a GB per minute would be what I should expect and that would be fine until some time in the spring when I could probably spring for a new computer.

The solution right now, looks like just having to ditch this transcoding stuff and go out and get a new quad core computer with the most power I can afford right now, and get something like Premiere CS4 so I can edit AVCHD natively. .... I cannot afford what comes out to using 3.3 GB's per minute including backup.

Are these results typical, or am I doing something wrong?
How are others managing to archieve such large file sizes?Any bhelp/suggestions are vey much welcome.
Sorry for the long post.
SW
 
I wish I provide some direct response, but we're in FCP on a Mac. I transcode to DVCProHD using a 3rd party utility about 2x.

I even use Panasonic's AVCHD to p2 transcoder in VMWare and it is about RT.

No problem using the DVCProHD footage on our 18 month old MBP or our desktop.

Something else might be happening.
 
shooting in 24p will help speed things up a little as well as you are only dealing with the 24 frames that need processed / rendered transcoded etc. but this may not be the look you are going for.
 
I've trancoded a clip on my Mac in FCP from AVCHD to Apple Prores and then I've tried to copy the clip in DVCPRO. The result is 1 minute for 1 gigabyte, more or less. Same for Apple Prores.
 
Im looking at a 720/24p clip i transcoded to dvcprohd and its 58 seconds long and its listed as being 329MB in size.
 
Conversion to DVCProHD from AVCHD will always result in larger files.

Yes and I am aware of that, however to start with 9 Gb's on my SDHC card transcode that up to 55GB's and then have that climb to 100 GB's after rendering it on the Premiere time line seems, to put it mildly, a bit much. Is this typical, or am I doing something wrong?
 
Doesnt sound right to me but I dont use PPro. i wouldnt think you should need to render for playback on the timeline if you have your project and timeline set up to work with the DVCPROHD footage correctly. Did you double check your settings for both audio and video?
 
There's something definitely wrong. Premiere CS3 can play DVCPRO-HD files natively, there should be no reason to render anything. CS4 can actually play AVCHD files natively so there'd be no reason to convert, either.

Make sure your CS3 is version 3.2 or later; check on the Adobe site for updates. But you should be able to directly import the MXF files made by the panasonic converter, no rendering necessary.
 
AVC-HD in Adobe CS4

AVC-HD in Adobe CS4

Hi

Even with the update to PP 4.0.1 CS4 does not support AVC-HD 720/60P.

It only supports AVC-HD 1080i.

Please tell me I am mistaken on this!

I spoke to an Adobe Engineer at DV Expo and was told that the next minor rev
(4.0.1) would include 720P support, but no luck.

So for AVC -HD 720P and Adobe it's back to transcoding for now.

Best Regards to the Group
 
David J. said custom presets were supported in the beta version.

Using 720/24p or 60 would help I would think in actually playing the footage.
 
I find that when I convert AVCHD to MXF at PH 24/1080P that i get 1 gig per 1 minute of DVCProHD. After I import them into CS3 or CS4 they do require rendering. Real time AVCHD in CS4 is bug ridden. Frozen frames, green screen frames and choppy playback that the Adobe rep at the DV expo said they are aware of and working on, so for now I find transcoding as my only option.
 
Last edited:
this may sound patronizing, but is your particular project set at DVCPRO HD 100 megabits and at 60p?

If one of these small details is askew then the NLE will conform your footage to the errant settings.
 
After I finished coverting my files to DVCPRO HD. I opened a DVCPRO HD preset 1080P 24 and imported the folder of the transcoded files into it. After I opened the files I saw that they were all listed as 29.9 files so I interpolated the files to 23.976 and edited away. Then I had to render.
 
Back
Top