Alan R Posted September 5, 2020 Share Posted September 5, 2020 New user just having a play, using one 10s clip dragged to timeline, then again and this time applied reverse. Export to mp4 and when it hits the reversed clip boy does it slow down to around 1/240th the previous speed. Happens around the 50% mark which confirms its rendering the reversed clip. Previous render - 2 clips both normal - to mp4 took around 0.5s. Next render - 1 normal other reversed - to mp4 took 1m59s. When it eventually completed it played perfect. Personally not too bothered as I seldom if ever use reverse. Wonder--- I loaded said clip into *****link editor, reversed it, rendered to mp4, loaded to VP, rendered just perfect, not quite <1s but close. This is how I will go the next time I want a reversed piece, but don't really know whats up with VP, I'm sure it should not take 240 times longer!!!.. Link to comment Share on other sites More sharing options...
borate Posted September 5, 2020 Share Posted September 5, 2020 Thanks for the report. Of course, once exported in another NLE, it becomes a simple clip for VP - no need to deal with the reversal. VP reversed clip export is slow. File a bug report or suggestion by clicking the chevron at the top-right of the VP window. Link to comment Share on other sites More sharing options...
Nationalsolo Posted September 6, 2020 Share Posted September 6, 2020 Hi Not confirming this here. Using VP 8.77 a 10 second clip added to the timeline twice and then the second copy reversed. (Pretty well instantaneous reversal) The timeline played normally in preview Export rendering progressed at a constant speed throughout. (47 seconds 1st half and 49 seconds for second (reversed half). The exported clip played normally. Nat Link to comment Share on other sites More sharing options...
borate Posted September 6, 2020 Share Posted September 6, 2020 Humm.... different result here. Thirteen-second mp4 1080 clip twice on timeline, with the second one reversed. Export at 1080 mp4 defaults. First clip export ended at about 3-4 seconds. Second completed at about 42-43s. Link to comment Share on other sites More sharing options...
Nationalsolo Posted September 6, 2020 Share Posted September 6, 2020 HI B Odd! I'll try a different clip.....I've just realized it was an mpg2 I used. Empty cache; added 9 second 1920 x 1080 mp4 clip twice with second one reversed on the timeline. Previewed as expected. Exported as mp4; Auto match content 1920 x 1080; Default quality, Letterbox; V1ariable Smart max 45fps First 50%..........120 seconds second 50%.....135 seconds On my old Vista machine this is much (much) slower than your test. However despite that not a huge difference between the two halves (but quite a bit longer than using the same sized mpeg2 clip! which is to be expected) CPU used 98 - 100% during this. Checked the first mpg2 clip again and got the same timings as before. Nat Link to comment Share on other sites More sharing options...
Jack11223344 Posted September 7, 2020 Share Posted September 7, 2020 HI, the reason that the first clip and NLE reverse are fast is most likely because of the lossless export, no re-encoding needed. If you try to use a different resolution other that the original, you can see the difference. Yes, the reverse algorithm can be optimized but not an urgent job. We will consider this in the future release. Link to comment Share on other sites More sharing options...
Alan R Posted September 8, 2020 Author Share Posted September 8, 2020 Oh well - guess that's it for the time being - no worries for me (hence the low priority) - if I need reverse I will do it as I proposed in my original post. At least we know what's going on - and support have it on their low priority list Thanks all. Link to comment Share on other sites More sharing options...
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