All consumer video cameras (HD/HDMI) that I have come across (in PAL-land) can record in "50i", that is 25 interlaced frames/second.
My own hands-on experience tells me that when the cameras are configured in that way, the live video on the HDMI port will also be 50i.
However, I have recently had reports that some recent models (e.g. Canon Legria) will output 50p on the HDMI live output regardless of the recording being 50i.
This whole interlace thing is of course an historic artifact, but for my specific application it is really a useful feature.
(If I capture 50i and de-interlace it, I can achieve 20 ms timing resolution (50 fields/second) with half the data bandwith of 50p which gives 50 frames/second)
Anyone with insights on this?
/JS
Try StreamFab Downloader and download from Netflix, Amazon, Youtube! Or Try DVDFab and copy Blu-rays! or rip iTunes movies!
+ Reply to Thread
Results 1 to 5 of 5
Thread
-
-
Bandwidth is the entire reason interlaced video exists. But once you start talking compressed video the bandwidth differential is much reduced, maybe even eliminated. Interlaced encoding is less efficient than progressive encoding. And at 50 fps progressive you can get away with less bitrate per frame to get the same visual quality vs. 25 fps.
-
-
If that's your issue then you have no choice.
And then you have all the problems and artifacts inherent in deinterlacing later.
Even if you capture uncompressed, you are likely going to compress the video eventually. If you use interlaced YV12 chroma subsampling (pretty much all distributions formats are YV12) you'll have spacial distortions as scan lines that are not next to each other are treated as if they are in interlaced YV12 encoding.Last edited by jagabo; 9th Nov 2017 at 10:04.
-
My Canon Legria G40 outputs both interlaced or progressive to HDMI depending on which is selected. All my video is done at 1080 50p 35Mbps and my PC has no problem running this. The big difference is that the internal video recorded on the SD cards is at 8 bit 4.2.0., whereas the HDMI output is 10 bit 4.2.2 which is great for recording high quality onto an external recorder in Prores or DNxHD.
Similar Threads
-
Record video from HDMI output
By Ricky Hembel in forum Newbie / General discussionsReplies: 3Last Post: 6th Nov 2016, 09:06 -
24 hour live straming from multiple cameras
By flomman in forum Video Streaming DownloadingReplies: 0Last Post: 29th Jul 2016, 05:16 -
Wha is the proper name of that video cameras? Are they amateur cameras?
By Stears555 in forum Camcorders (DV/HDV/AVCHD/HD)Replies: 5Last Post: 9th Jul 2014, 18:06 -
How to stream live from two cameras?
By geteee in forum Newbie / General discussionsReplies: 1Last Post: 19th Jan 2014, 04:02 -
Capturing live 3D video from a camcorder using HDMi and 4G
By boris_blackmilk in forum CapturingReplies: 7Last Post: 7th Jun 2013, 13:00