Here is a 2-part msg I posted on the Photography (and Video) forum at forums.whirlpool.net.au concerning what compromises would be required to reduce the media consumption rate to 4GB/hr. Since it discusses how various parameters affect the compression achieved, and it uses the formats available in a HC-V750, the same formats as in the HC-V770, I think it's worthwhile reading it all and trying to get to grips with the concepts....The camcorder im using has its setting on HG 1080 is that what it should be set on? Done a bit of reading and it seems these setting are to do with compression? So its Quality of the recording.
Option 60s Bitrate (max/typ) 1HR BPF MB Mbits/sec GB Bits/(Pixel*Frame) 60p 180 28/25 10.8 .190 PH 154 24/21.5 9.24 .325 HA 113 18/15.7 6.78 .236 HG 87.9 18/12.3 5.27 .184 HE 35.2 18/4.93 2.11 .070
Option 60s Bitrate (max/typ) 1HR BPF MB Mbits/sec GB Bits/(Pixel*Frame) 1080p60 50M 325 49.2/45 19.5 .362 1080p60 28M 183 26/25.2 10.9 .202 720p30 58.2 14/8.0 3.49 .289 iFrame (540p30) 65.0 26/8.95 3.9 .576
Modern PCs should be able to handle 1080i. Laptops may have a problem, depending on the model. If the real-time playback is jerky inside your video editor due to the amount of processing being performed on-the-fly, you may have the option to select smaller (Auto/Full/Half/Quarter) and less processed (Draft/Preview/Good/Best) previews. (These are the options I see in Sony Vegas.) Doing so doesn't affect the quality of the final rendered version, only how you'll see it when working on it.Ive been reading up a bit if editing in 1080i this can be tough and slow on the pc is that right? And some media players cant handle it if playing on a pc, Is there any truth in this?
We recommend what we find works with a certain camera. I have the 750 which, as I said before, is the slightly older version of the 770 i.e. it has the same basic spec. I record in the best quality the camera will give me and then render two files, one in MPEG-2 for a standard DVD and a second in AVC/H.264 which gives a AVCHD file suitable for replaying on my Blu-Ray player. To me it makes sense to record in the best quality possible.The pay-off for you will be that you'll have sufficient understanding of the trade-offs involved in video compression to be able to make your own informed choices, rather than just relying on what people recommend
HG 1080 is the second to lowest quality. Either go for 1080/50p or PH 1080/50i.
Don't know the model number but at the back of your User Manual there is a section:-
Recording modes/approximate Recordable time
This will give you a rough idea of quality vs recording time. I use 1080/50p as standard.
As mentioned in my 2 msgs, both these container formats are using h.264-compressed video streams. It's the video compression method, framesize, whether interleaving is used and the bitrate that determines the ultimate quality. If all these are similar, since the video compression method is the same for both formats, the picture quality will also be very similar. The two progressive choices below from the formats offered in the V750 will look pretty much the same:Does setting it to mp4 make it any better or less than setting it to Avchd?
Option 60s Bitrate (max/typ) 1HR BPF MB Mbits/sec GB Bits/(Pixel*Frame) ACVHD 60p 180 28/25 10.8 .190 MP4 1080p60 28M 183 26/25.2 10.9 .202