Ok, got it. Thanks! -----Original Message----- From: ffmpeg-user <[email protected]> On Behalf Of Paul B Mahol Sent: Saturday, June 19, 2021 7:53 PM To: FFmpeg user questions <[email protected]> Subject: Re: [FFmpeg-user] ffmpeg transitions not working
On Sat, Jun 19, 2021 at 3:58 PM <[email protected]> wrote: > Yes, adding this parameter worked. Thanks for your suggestion, it > allows me to generate the transitions I need... > But I'm curious to understand why this parameter is required. All > samples I was able to find for transitions, nobody included it. > Also, both videos that I'm using are cut out from a larger video file, > so all their encoding parameters are the same. Shouldn't ffmpeg have > all the parameters it needs? > > As for the player, I am not using anything in special, it is the > default that plays an mp4 in Windows 10. In task manager it shows up > as Movies & TV with a process name of Video.Ui.exe and a child process > of RuntimeBroker.exe. It works fine with all my mp4. Also, all videos > generated with ffmpeg, like extracting a video, concatenate videos, > etc., show fine with this player. Just the transition doesn't work. > > By the way, I tried to open the bad files with Media Player and it > also shows all black. It doesn't seem to be a player issue. > > An additional question - although your suggestion worked, the > generation of the file also took a long time, like with my > unsuccessful trials. Are transitions expected to take so long time? > I'm wondering because everything else I did with ffmpeg so far has been very fast. > > Please excuse my questions, the video manipulation is quite new for > me...:) > Filtering, unlike remuxing, can be slow as it needs to decode and encode output. To make it faster you need to use cuts in such a way so no excessive decoding ( so offset is always 0) is ever done. > > Thanks for your help > > > > -----Original Message----- > From: ffmpeg-user <[email protected]> On Behalf Of Gyan > Doshi > Sent: Saturday, June 19, 2021 3:56 PM > To: [email protected] > Subject: Re: [FFmpeg-user] ffmpeg transitions not working > > > > On 2021-06-19 18:22, [email protected] wrote: > > I'm having problems with transitions. To be sure I am not making > > something wrong, I simply copy/paste the example shown in > > https://ffmpeg.org/ffmpeg-filters.html#xfade, adjusted my two video > > file names to comply with the example, and got the same problems as > > with my own commands. > > > > > > > > The example on the site shows this: ffmpeg -i first.mp4 -i > > second.mp4 -filter_complex xfade=transition=fade:duration=2:offset=5 > > output.mp4 > > > > My first and second files have 1 min each. > > > > > > > > First I run the command without any change; obviously offset 5 isn't > > appropriate but I gave it a try. > > > > Second I adjusted duration to 10 and offset to 55 to be appropriate > > with my two mp4 files. The result was the same: > > > > The final output.mp4 has the right duration (1:55) but it is totally > black. > > > > > > > > What I see during execution is that the first video is read/copied > > to > > output.mp4 quite fast. After that it starts reading second.mp4 and > > works a very long time on it, probably close to one minute. > > Which player? > > Try > > ffmpeg -i first.mp4 -i second.mp4 -filter_complex > xfade=transition=fade:duration=2:offset=5 -pix_fmt yuv420p output.mp4 > > > Regards, > Gyan > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
