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...:) Thanks for your help -----Original Message----- From: ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> On Behalf Of Gyan Doshi Sent: Saturday, June 19, 2021 3:56 PM To: ffmpeg-user@ffmpeg.org Subject: Re: [FFmpeg-user] ffmpeg transitions not working On 2021-06-19 18:22, ibur...@compuscience.com 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 ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
