Hi, Thanks again for these detailed information! Evert, I have not received the mail mentioned by Harald (that's why you may thing I am ignoring it), it is not in the archive of the list neither, can you resend it?
Can't we render directly at 25fps from kdenlive (and from a 50fps project)? It uses to be possible (from the link of my first post), generating bug as well? Regards, Cyril Le mardi 24 octobre 2017 à 13:06 +0200, Evert Vorster a écrit : > Hi there, Cyril. > > I can describe the bug to you, and then you can decide whether you > want to take your chances with it. > Kdenlive uses frames to refer to certain points in the video, as well > as the associated clips. > > Say you have a clip of you playing fetch with a dog that is 2000 > frames long, and encoded at 50fps. > > If you read that clip into a project that is only 25fps, kdenlive > would then do some behind the scenes math and present the clip to you > as only 1000 frames, with every second frame dropped. > This is to preserve the original length of the clip, and make editing > easier. It's all good and well, and the right thing to do. > > The problem comes in when you start your project with one framerate, > and loaded your clips, and then change to another framerate. > The clips in the project are re-read and updated to have the right > amount of frames for the new framerate, but the starting end ending > points of the clips on the timeline are not. > > To put this into the example of the clip with the dog playing > fetch.... Let's assume that at 50fps from frame 1500 to 1800 the dog > is catching the ball. You select this range, and put it on the > timeline. > At the lower framerate, the catching of the ball should happen at > frame 750 to 900, right? The timeline never updates that start and > end frame are never updated. > In this case it would refer to frames that does not even exist in the > clip at the new framerate. In all cases it changes the _content_ of > the clips, so at best you will be looking at another part of the clip > in the final render than the part you selected. > > I highly recommend against changing a project's frame rate at this > point in time. > > Here is the latest bug in the bug reporter: > https://bugs.kde.org/show_bug.cgi?id=368962 > > Kind regards, > -Evert- > > > On 24 October 2017 at 12:37, harald.albrecht <harald.albre...@gmx.net > > wrote: > > Yes, and no. As Evert pointed out, there's currently a bug in the > > timeline handling that sometimes causes issues (but not always as > > far as I understand, but I may be wrong here). The safest approach > > is as Evert suggested to render at 50fps and then use ffmpeg for > > post-processing to drop every second frame. > > > > Best regards, > > Harald > > > > > > -------- Ursprüngliche Nachricht -------- > > Von: Cyril Duveau <linux4cy...@free.fr> > > Datum: 24.10.17 10:12 (GMT+01:00) > > An: kdenlive@kde.org > > Betreff: Re: Render a 50fps project at 25fps > > > > Hello Harald, > > > > Thank you for your detailed response. > > Just to be sure, I can do that change while all my files are loaded > > and > > I am ready to render? > > Once I have the settings at 25fps, could I go back to 50fps the > > same > > way (HD 1080p 50 fps)? > > > > I want to perform tests to see if it is really worth rendering at > > 50fps > > or if 25 is enough... > > > > Thanks & Regards, > > Cyril > > > > Le lundi 23 octobre 2017 à 21:08 +0200, Harald Albrecht a écrit : > > > Cyril, > > > you don't mention the other project settings, so I need to guess > > to > > > some extend; I'm assuming FullHD for the moment. In the Project > > > > Project Settings... dialog, set the "Fps" drop down to 25 so you > > > don't need to sift through all the many profiles. In the list, > > open > > > the "Full HD 1080", so you see (assuming that no filter is set > > for > > > scanning) two entries: HD 1080i 25 fps, as well as HD 1080p 25 > > fps. > > > Select the second one (HD 1080p 25 fps), click "Ok". Done. > > > > > > Best regards, > > > Harald > > > > > > Am 23.10.2017 um 12:38 schrieb Cyril Duveau: > > > > Hi, > > > > > > > > I would like to produce a video at 25fps from footage at 50fps. > > > > The project settings are for 50fps, that's the rendering > > profile > > > > for > > > > exporting that I don't know where/how to specify the fps. > > > > > > > > I found this but I can't find how to adapt it to the new > > system: > > > > https://forum.kde.org/viewtopic.php?f=272&t=124869#p329129 > > > > Can you help? > > > > > > > > Thanks, > > > > Cyril > > > > > >
