[FFmpeg-user] ffmpeg transitions not working
iburman at compuscience.com
iburman at compuscience.com
Sat Jun 19 16:57:59 EEST 2021
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
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> On Behalf Of Gyan Doshi
Sent: Saturday, June 19, 2021 3:56 PM
To: ffmpeg-user at ffmpeg.org
Subject: Re: [FFmpeg-user] ffmpeg transitions not working
On 2021-06-19 18:22, iburman at 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
> 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.
ffmpeg -i first.mp4 -i second.mp4 -filter_complex
xfade=transition=fade:duration=2:offset=5 -pix_fmt yuv420p output.mp4
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