File Sizes

[David L Lewis]

Ive just captured two complete tapes, using Adobe Premiere Pro, once in HDV and once letting the camera down convert into SD.

The files' sizes are interesting!?
Tape 1 SD 14,090,143 KB
Tape 1 HDV 12,063,130 KB
Tape 2 SD 14,037,855 KB
Tape 2 HDV 12,021,474 KB

Not really what I was expecting.

Is that "normal" I.e that the HDV file is smaller than the SD file

[David L Lewis]

even weirder

looking at what Ive actualy got in the HDV files, using Encore, they both freeze at around the 10minute 20 second mark and then play that frame right through to the end.

WTF is going on?

Update

However when looking at them In adobe premiere pro the files play normally for the full hour

[Gavin Gration]

Does Premiere Pro do native HDV?

As far as I can tell it converts the stream to something else.

Yesterday I imported 45 minutes into CS3 from a damaged tape. I then exported it again with no changes to a new tape. CS3.0 spend half an hour "converting to HDV".

If there's a native HDV option I haven't found it (yet) or (more likely) Adobe native HDV and everyone else's are not the same.....

[steve]

I think that PPro converts a .m2t transport file to a .mpg programme file. This removes the streaming data that makes it more robust for transport like broadcast and tape. Thus the 'real' video file is somewhat smaller than the space taken on the tape, i.e. the DV footage. Removal of the transport data give PPro a slightly easier ride when playing/rendering.
The downside is that export to tape involves adding the streaming data back in which accounts for the "converting to HDV".

Steve

[Alan Roberts]

Both DV and HDV are nominally 25Mb/s, so the file sizes should be broadly similar, differing only in metadata. Only if you transcode to another codec will the file sizes change.

[David L Lewis]

that seems to make sense Alan

But anyone any idea why if I look at the resutant HDV AVI files in premiere they play as you would expect them but if I import them as timelines into encore I get the problem at 10 minutes 20 seconds on both tapes?????

[Alan Roberts]

Sorry, no idea. But, 10 minutes 20 seconds is 10*60+20=620 seconds, and at 25Mb/s that's about 620*25=15500 Megabits which is 15500/8=1937.5 Megabytes, which is extremely close to 2Gigabytes. Now, way back in the dark ages, there was a 2GB limit to files that Windows could handle, but that was fixed by NTFS which can handle files up to 4TB.

I wonder, what format is your hard drive? Are you hitting the 2GB limit of FAT32? You should be using NTFS or better.

Just a thought.

[David L Lewis]

Not sure its a file size issue as Ive played arounf with 14 gigabyte files without any problems.

Its just these two HDV , AVIs that seem not to want to play properly within encore, they are perfectly happy in premiere pro.

[Alan Roberts]

OK, I've no idea then.