sumptor
21st January 2002, 18:56
Hey,
I did a little test and was surprised by the results.
Divx file #1:
I captured from a VCR (NTSC) at 320x240 resolution using Huffyuv. I then encoded to divx using Vdub using a 2-pass method at a video bit rate of 1000. The first pass, I kept the resolution at 320x240. However, on the second pass, I added a filter to resize to 640x480. So my final divx file was a 640x480 file encoded at vbr of 1000.
Divx file #2:
I then repeated these steps using the same exact source video but instead kept the resolution at 640x480 from start to finish (ie. captured and performed both encoding passes at 640x480 1000 bit rate with no resizing involved).
I was surprised to see that the first method, with the resizing, looked better visually when compared to the second method. The second file had noticeably more artifacts and had a more "blocky" look to it.
Why is resizing to 640x480 better than staying with 640x480 to begin with?
I did a little test and was surprised by the results.
Divx file #1:
I captured from a VCR (NTSC) at 320x240 resolution using Huffyuv. I then encoded to divx using Vdub using a 2-pass method at a video bit rate of 1000. The first pass, I kept the resolution at 320x240. However, on the second pass, I added a filter to resize to 640x480. So my final divx file was a 640x480 file encoded at vbr of 1000.
Divx file #2:
I then repeated these steps using the same exact source video but instead kept the resolution at 640x480 from start to finish (ie. captured and performed both encoding passes at 640x480 1000 bit rate with no resizing involved).
I was surprised to see that the first method, with the resizing, looked better visually when compared to the second method. The second file had noticeably more artifacts and had a more "blocky" look to it.
Why is resizing to 640x480 better than staying with 640x480 to begin with?