Forum Archive Home -> Video Conversion -> Does a files resolution affect conversion speed?
Does a files resolution affect conversion speed? |
| perdomot posted 2009 Nov 04 10:45 |
| Wondering if it takes longer to convert an mkv file that has high definition video in it than one that has 480p video. I use avidemux to convert my mkv files for my ipod touch and some take 3-4 minutes while others take 9-10 minutes. Is this possible or do other factors affect speeds? Thanks. |
| lordsmurf posted 2009 Nov 04 11:59 |
| Yes, it does. Compare a 352x480 encode to a 720x480 encode, even if bitrates are the same. It takes longer. Changing resolutions takes even more time. |
| jagabo posted 2009 Nov 04 12:16 |
| Input frames size has a small effect on encoding speed. Output frame size has a large effect. Other factors have an effect too (complexity of video, encoder settings, etc.) |
| perdomot posted 2009 Nov 04 23:06 |
| So going from a 1280 x 720 mkv file to a 480 x 272 mp4 file would take longer than if the mkv was a smaller resolution? |
| jagabo posted 2009 Nov 05 06:22 |
| Yes. First the larger frame takes longer to decompress. Then it must be downsized to the new resolution. Both of those steps take time. Usually not a lot compared to the time it takes to compress the results though. |
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