.dv Data Rate

[Rafael Amador]

Hi john,
You are right.
I noticed what you points some 6 years ago.
When capturing DV footage with iMovie the files where right double size than when captured with FC.
I thought that was fixed long ago.
I don’t have now iMovie to try it, but I will do a test with MPGStreamclip.
Rafael

http://www.nagavideo.com

[Zane Barker]

[Rafael Amador] “When capturing DV footage with iMovie the files where right double size than when captured with FC.”

IMovie and FCP do not capture footage from DV Tapes using the same codec.

https://www.dc.umich.edu/groundworks/Docs/video/exportingMoviesfromiMovietoFCPro.pdf

[John Gonzalez] “DV25 video in qt self contained had a data rate of about 3.9MB/s. Why when I import a .DV video stream into FCP does it appear to have 2 embedded audio tracks at 32 bits instead of 16 bits and a data rate of 6.9MB/s?”

John you did not say where you are getting your .dv file from, but if I remember correctly .dv files are not in the DV25 codec.

FCP does not capture video to .dv files, I suggest converting them to a codec that is listed in the easy setups of FCP.

There are no “technical solutions” to your “artistic problems”.
Don’t let technology get in the way of your creativity!

[Rafael Amador]

[Zane Barker] “IMovie and FCP do not capture footage from DV Tapes using the same codec. “
Hi Zane,
The codec is the same: DV.
In both cases there is not transcoding on capture. The same video info get packed in two different containers.
You can get a .DV file when you export in QT “Movie to DV Stream”, when capturing with iMovie or when you “export to DV” in MPEGStreamclip.
Rafael

http://www.nagavideo.com

[Zane Barker]

[Rafael Amador] “The codec is the same: DV. “

Ok I just did some tests myself capturing in both imovie and FCP, and you are correct that the video codec is the same. However it looks like the audio is captured differently.

Different audio codecs easily explains the file size difference, as well as that is why FCP always wants to render files captured in iMovie when they are brought into FCP.

There are no “technical solutions” to your “artistic problems”.
Don’t let technology get in the way of your creativity!

[Alexander Kallas]

[Zane Barker] “Different audio codecs easily explains the file size difference, as well as that is why FCP always wants to render files captured in iMovie when they are brought into FCP.
“

No, it’s not the codec that’s different. iMovie captures as DV Stream, which locks the audio and video.
FCP does not recognize “muxed” media from iMovie, and hence has to split the audio off, ie render.
But the camera is recording the DV Codec.

Cheers
Alexander

[Zane Barker]

[Alexander Kallas] “No, it’s not the codec that’s different. “

I don’t think that you understood what I said in my last post. I said it is NOT the video codec they are the same. It IS the audio codec.

[Alexander Kallas] “iMovie captures as DV Stream, which locks the audio and video.
FCP does not recognize “muxed” media from iMovie, and hence has to split the audio off, ie render. “

Yes what you said is basically are describing is how the AUDIO CODEC handles the audio.

[Alexander Kallas] “But the camera is recording the DV Codec. “

We were not talking about camera at all we were talking about how the software interprets that camera signal and creates the file.

Unfortunately John has still not told us where he is getting these .dv files from we are only assuming that he is getting them from iMovie.

There are no “technical solutions” to your “artistic problems”.
Don’t let technology get in the way of your creativity!

[Alexander Kallas]

[Zane Barker] “Yes what you said is basically are describing is how the AUDIO CODEC handles the audio.
“

?? ..really the difference in how iMovie and FCP handle the audio in the DV codec.

Cheers
Alexander