Jump to content

Brian Flint

Members
  • Posts

    12
  • Joined

  • Last visited

Posts posted by Brian Flint

  1. About 12 years ago I did a lot of home movies of family using a Canon Camcorder with a DV tape. I bought a Firewire card, IEEE 1394, and fitted into my PC. With suitable cable from Camcorder to PC I transferred the recordings to the Hard Drive on my PC. This resulted in .avi file  720 x 576 , 25.00 fps , Data rate 28887kbps. Interlaced. In some cases I had 'wide screen PAL' ie 16 by 9 and in other cases I had 4 by 3 ( widescreen not selected when recording ). Back then I decided to transcode the .avi to mpg files suitable to burn onto DVD . The bit rate drops to around 6Mbps and I kept the frame rate at 25 fps interlaced. This gave good results for a family movie. A year or so ago, I decided that DVDs are not future proof and I need to make the footage be 16 by 9 with black bars either side if original was 4 by 3 and use progressive scan - ie de-interlace and use a resolution of 1920 x 1080. I felt the biggest problem was the de-interlacing of fast moving image - ie children running about. There is also another problem I find today and that there is difficulty to find an Editor which will accepting the original .avi files. Resolve 16 does not accept it.  Anyway I have managed one way or another to make the format to what I want, but I may have not choose the best way to do it. When I show the footage to my grandchildren they just see the content and couldn't care about the finer details of the quality.

  2. 2 hours ago, KaiS said:

    To verify the findings I'd use a small temperature probe inside the card slot.

    The card's contact area seems to be located close enough to the critical parts (CPU/RAM) to give a reasonable representation of what's goig on inside.

    Even more so during the cooling down phase when no extra heat is generated.

    I would agree with this. If very cold ( or fairly cold ) air could be forced into the Memory card area ( Memory cards are removed ) some this cold air should flow past the CPU. My experience ( as an engineer ) is that even a slight amount of moving air across the top surface of a chip ( cpu in this case ) will have a significant cooling effect. 

  3. 14 hours ago, Lux Shots said:

    Most embedded non-volatile memory has a max write cycle of 200,000. A separate EEPROM or FRAM, has higher write/erase cycles, but I doubt they added another chip to do this.

    Yes you are right. To prevent too many write cycles the timer would have its count value written to the non-volatile memory every, say, 2 minutes. At this rate the 200,000 max write cycle would take a 277 days of continuous use to reach the limit. It it is assumed the camera is in use, say 4 hours, of every day then the limit would be reached in 4  1/2 years.

  4. I am retired now but have experience over many years as an electronic design engineer.

    If there are 'timers' employed in the design then it is likely they would 'reset' to a zero or starting count state when the power is removed and then returned to  electronics. This would occur when the battery is removed. for a short period..

    However if Canon was clever they could continuously write the count value of the timer(s) to a non-volatile memory  and when the power is resumed ( after battery removal ) the values of the count stored in the non-volatile memory could be returned to the timer(s). To do this there would have to be some non-volatile memory in the camera.

     

  5. It should be noted that 720x480 is 1.5 to 1 , and 640x480 is 1.333 to 1. So converting from one to the other means black bars must appear somewhere if you don't stretch the original image.

    I have converted some old SD interlaced footage in the PAL format. An some of it was widescreen PAL where the pixels are nowhere square ( can't remember the ratio ) but the result is a 16 by 9 image from SD which has ( in PAL ) 720 x 625.

    I wanted to put my old footage ( family movies etc ) made on a DV recorder ( PAL) into a non interlaced ( ie progressive ) format which I felt would be more future proof. I tried various things , but in the end I just put the SD footage into an editor and set the output to be 1920x1080 ( progressive ) and kept the frame rate the same. Davinci Resolve will not accept interlaced video , so I used handbrake to do this conversion. This would result in a image which had black bars at the sides. I would then if necessary stretch the image so that it was as original . I would try and find a circular object in the image and make it round . I found that Davici Resolve was useful for this as it allowed the x to y ratio to be fine tuned. I would still have black bars at the sides but at least people did not look fat or thin. I don't know if any of this helps , but that is what I do.

  6. A couple of days ago, I down-loaded the beta version of Topaz Megapixel AI to my PC ( Windows 10 , i7, 16GB ram, GTX650 Ti graphics card with 2GB memory )

    It is free for a 30 day trial.

    I tried some sample clips - process was painfully slow. To render a clip 1080 30p which was 1 minute long was going to take 7.5 hours.

    I have some clips made 12 years ago of my grandchildren. 640x480 15fps . I have managed to up-scale these to 1920x1080 30fps in Resolve 15 and get improvements

    The stabilizer seems to reduce jerky effect of 15 fps and produce something which is better to view.

    I wondered what the Topaz Megapixel AI would do when using it to up-scale from 640x480 to 1920x1080. I tried it on a clip 2 seconds long  to reduce render time.

    It did 'improve' the image quality to some extent. I compared a before and after image of a single frame.

    I also tried it on some 1920x1080 30fps clips converting them to 4K. I compared before and after a still frame but couldn't see any difference.

    Topaz-  640x480 to 1080p.jpg

  7. I don't have a GH5, but some time ago, I downloaded some original footage from the GH5. It was 4K h.264 10 bit 422.

    I don't use premiere or FCP . I do have Davinci Resolve and some other editing software. I tried to edit ( grade ) the downloaded original footage , but nothing would accept it.

    I can play the original footage with VLC and MPC-HC video players on my windows 10 PC.

    I used HandBrake to transcode the 4K h.264 10 bit 422 footage to 4K h.264 8 Bit 420. I can now edit the transcoded footage in Davinci Resolve and a number of other video editors. Of course the advantages of 422 and 10 bit have been lost.

     

  8. Thanks Neumann films for the original GH5 files.

    It is interesting to have some h264 files with 4:2:2  and 10bit . I guess this will become much more common in the near future.

    I also found these were not accepted by Davicii Resolve. 

  9. Today I discovered H265 HVEC files will play on Windows media player without any problems , this includes 1920x1080 50p, 3840x2160 25p, 4096x2160 24p ( all original files from the NX1 which I downloaded ) . I have windows 8.1 on my pc. There must have been a windows update in the last day or so for this to happen. I also can play H265 HVEC files which I have converted using Handbrake from various H264 coded video files. Note all of these H265 HVEC video files will also play on the MPC-HC player.

    ​Good to see support trickling out yet further. What spec PC do you use?

     

    My PC is Intel Core i7-3930K Sandy Bridge-E 6-Core 3.2GHz  with 16GB ram

     

  10. Today I discovered H265 HVEC files will play on Windows media player without any problems , this includes 1920x1080 50p, 3840x2160 25p, 4096x2160 24p ( all original files from the NX1 which I downloaded ) . I have windows 8.1 on my pc. There must have been a windows update in the last day or so for this to happen. I also can play H265 HVEC files which I have converted using Handbrake from various H264 coded video files. Note all of these H265 HVEC video files will also play on the MPC-HC player.

×
×
  • Create New...