Hannu Vuolasaho <[EMAIL PROTECTED]> wrote on Thu, 24 May 2007 > > This is second hand information because my HDV camera is still in the shop. > I'm waiting for 1080p :) > > Anyway. there is program called mpegrab or similar which can grab trough > firewire the uncompressed video. The need of mpegcompression comes from the > DV-media which can't handle the stream without it. > > I've seen this work with my friend when he shot a scene Sony Vaio in his > pocket grabbing the scene. He is real gear geek. > > Or am I now giving totally wrong advices?
Regarding hdv/mpeg2 capture: As discussed also on this list and i.e listd on this link http://www.linux1394.org/view_device.php?id=1035 mpg1394grab and test-mpeg2 are mentioned for hdv capture. I've not found these tools available for openSUSE as I'm using. Currently it looks for me of more interest to get a running version of and try dvgrab w/full hdv-patch as announced on this list and here: http://sourceforge.net/tracker/index.php?func=detail&aid=1703694&group_id=14103&atid=314103 I'm interested to hear possibly update info about dvgrab compiled with this patch. Uncompressed video over firewire: Maybe, maybe not for DV25 I think, dependent of the baud rate capability of the camcorder's 1394 interface. FX7 has a S100=100Mbps i.LINK interface (while higher capacity S200 and S400 interfaces do exist). DV25 compressed 5:1 uses 25Mbps, or about 3,6MB/s included audio. "Uncompressed DV25" video looks therefore to require about 125-150Mbps To compare with HDV 1080i video that also use 25Mbps, does uses a much higher bit rate reduction ratio 20:1 (mpeg2 compression). Uncompressed HDV 1080i looks therefore to require higher bandwidth than Firewire can manage. > The HDMI confuses me a bit. >> > >> >The CityDisk (the second link in my inital post above) is also claimed to >> >be able to record in DV format at the same time as HDV is recorded on >> >If you are playing a 1080i HDV tape, the 4:2:0 MPEG-2 is decoded and >> >chroma up-scaled to a 4:2:2. The HDMI chip downscales 1440 to 1280 while >> >it up-scales 540 to 720. The result is 720p which is output via HDMI." >> > > > Be sure to check the firmware of Citydisk. Some work, some don't. I believe > this information can be digged from various webforums. Until HDMI capture cards (with driver support for Linux) become available, HDMI is of most practical use for output monitoring. As a more intelligent interface, HDMI does automatically sense the capability of the receiver and does scale the output to HDV 1080i, HDV 720p or DV 480i/576i according to that. Terje J. Hanssen _______________________________________________ Cinelerra mailing list [email protected] https://init.linpro.no/mailman/skolelinux.no/listinfo/cinelerra
