top hd camcorders comparison image
Derek
I know that interlaced video is where every other line is scanned from left to right, but I'm not sure what progressive video is. Is it where instead of every other line, every line is scanned from left to right; is it where instead of scanning from left to right, every line is just suddenly presented in a series; or is it where every line is just presented all at once? And does progressive video vary in how it's displayed if it's on a CRT or an LCD, or is at all the same?
Thank you... oh and one more question: does anyone know why 1080 was chosen as being high definition? Where did this specific resolution come from, and does this mean that 16mm film is technically the equivalent of above HD resolution?
Answer
All television cameras work by scanning. line by line, right to left, top to bottom. In interlace the top to bottom sequence is done twice per frame and the lines to be scanned are alternated. this results in 2 pictures called fields. By the use of fields the effective frame rate is doubled and eliminates flicker and insures smooth motion.
For progressive, the idea of fields is eliminated, and the top to bottom sequence is only done once per frame. When converting motion pictures to video, the use of interlace or progressive is a moot point because the source is a single frame of film. For modern camcorders that use very high compression, like AVCHD only one frame in 8 is actually taken so the idea of interlace does not apply. It is easier for the digital data to be stored in a progressive fashion. this does result in very poor motion resolution That is why 720HD is usually 60 fps, being about the same data rate as required for 1080HD but it reduces somewhat the flicker and motion problems.
Some dSLR cameras use CCDs that are scanned vertically?!!! This leads to some rather bizarre artifacts in motion video when the digitqal frames are read out as normal horizontal line scans.
Standards for HD was set by the ATSC (advanced television standards committee) as part of the roll out of digital television 20 years ago. The codec used is MPEG2, which requires macro blocks of 16x16 pixels. This works fine for 480x640, 480x720, 720x1280 and not quite for 1080x1920. Television HDTV is actually broadcast as 1088, the TV set does not use the first and last 4 lines. All other digital video compression schemes use the 16x16 pixel macro block except miniDV. miniDV is based on an earlier video standard called D1.
D1 at 300 mbps generally considered the video equivalent of 35mm motion picture film. ATSC HD is about 16mm equivalent. Most television work is done at 50 to 150 mbps. There are other issues involved in making a comparison, such as aspect ratio, so there is no exact comparison. Film has some issues like gate weave and judder than video does not have.
All television cameras work by scanning. line by line, right to left, top to bottom. In interlace the top to bottom sequence is done twice per frame and the lines to be scanned are alternated. this results in 2 pictures called fields. By the use of fields the effective frame rate is doubled and eliminates flicker and insures smooth motion.
For progressive, the idea of fields is eliminated, and the top to bottom sequence is only done once per frame. When converting motion pictures to video, the use of interlace or progressive is a moot point because the source is a single frame of film. For modern camcorders that use very high compression, like AVCHD only one frame in 8 is actually taken so the idea of interlace does not apply. It is easier for the digital data to be stored in a progressive fashion. this does result in very poor motion resolution That is why 720HD is usually 60 fps, being about the same data rate as required for 1080HD but it reduces somewhat the flicker and motion problems.
Some dSLR cameras use CCDs that are scanned vertically?!!! This leads to some rather bizarre artifacts in motion video when the digitqal frames are read out as normal horizontal line scans.
Standards for HD was set by the ATSC (advanced television standards committee) as part of the roll out of digital television 20 years ago. The codec used is MPEG2, which requires macro blocks of 16x16 pixels. This works fine for 480x640, 480x720, 720x1280 and not quite for 1080x1920. Television HDTV is actually broadcast as 1088, the TV set does not use the first and last 4 lines. All other digital video compression schemes use the 16x16 pixel macro block except miniDV. miniDV is based on an earlier video standard called D1.
D1 at 300 mbps generally considered the video equivalent of 35mm motion picture film. ATSC HD is about 16mm equivalent. Most television work is done at 50 to 150 mbps. There are other issues involved in making a comparison, such as aspect ratio, so there is no exact comparison. Film has some issues like gate weave and judder than video does not have.
How do I put AVC/H.264 files from an HD camera and encode an AVCHD DVD to play in my Blu-Ray player?
usmcwartha
Seems like it should be real simple, but it's not. The Samsung camera I have records to MP4 files encoded as AVC/H.264. I should be able to encode to AVCHD and burn to a DVD and play that in my BD player. The software that comes with the camera is garbage. How do I do this? What software should I use? Seems all I can find are cryptic 10-step processes.
Answer
1) Get and install a video editing application that can deal with AVCHD video. Current versions of Sony Vegas and Adobe Premiere float to the top for Windows/Vista. iMovieHD '8 or newer and current versions of Final cut for Macintosh (running on an Intel Mac).
2) When editing is complete, Save As or Export as an h.264/ACHD file. Burn the file to a DVD. Remember, reular single lyr and double layer DVDs hold only 4.7 gig and 8.5 gig, respectively. In comparison, BluRay blanks for BluRay recorders star at 25 gig. The amount of compression you apply in the final render process will determine what can fit - and the more you compress the worse the video quality gets.
3) Yes. The software in the box with the camcorders is garbage. It is the same with Panasnic, Sony, Canon and JVC... Samsung is not the only one that does this.
1) Get and install a video editing application that can deal with AVCHD video. Current versions of Sony Vegas and Adobe Premiere float to the top for Windows/Vista. iMovieHD '8 or newer and current versions of Final cut for Macintosh (running on an Intel Mac).
2) When editing is complete, Save As or Export as an h.264/ACHD file. Burn the file to a DVD. Remember, reular single lyr and double layer DVDs hold only 4.7 gig and 8.5 gig, respectively. In comparison, BluRay blanks for BluRay recorders star at 25 gig. The amount of compression you apply in the final render process will determine what can fit - and the more you compress the worse the video quality gets.
3) Yes. The software in the box with the camcorders is garbage. It is the same with Panasnic, Sony, Canon and JVC... Samsung is not the only one that does this.
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