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Closed 9 years ago.
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I have imported PAL DV. When trying this
ffmpeg -i my_video.dv output.mp4
I get interlacing issues.. So I need to deinterlace the input somehow...
This did the trick!
ffmpeg -i my_video.dv -vf yadif output.mp4
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Closed 2 years ago.
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Learning to speed up and slow down video using the ffmpeg setpts filter, but I am struggling to get a simple expression to work.
ffmpeg -i .\F5-ff.mp4 -filter:v "setpts=0.25*PTS" ff-test3.mp4
I get the output file, but it is not any faster than the original.
I'm sorry if this has already been addressed. Most related post I've found were trouble shooting more complex operations past this step. Im working in a powershell terminal fyi.
Just realized what was happening...I was looking at the total length of the video, but closer look showed that video portion was actually faster, but total length of file remained unchanged because audio track had not been shortened.
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Closed 1 year ago.
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i use to convert videos by ffmpeg with h264_nvenc codec, currently i noticed that nvidia-smi command shows GPU utilization is less that 20 percent.
how could i utilize more GPU and fasten the process?
You can’t. Nvenc is not gpgpu. It is deticated silicon for accelerating some steps of the video encoding process. The bottle neck is in this component. Not in the vector units.
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Closed 1 year ago.
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For a one hour dash cam video in normal speed, is it possible to create a smooth timelapse video from it?
Most tutorials online I found about "timelapse + ffmpeg" are with static jpeg files combined into a timelapse video. These often result jiggle between frames, are the any specific parameters which would make the video looking very smooth & stable?
Should I just setpts=0.5*PTS for the trick? Any must-have or little-known tricks?
Update: this question is asking for specific programmable ffmpeg parameters.
Yes, that's the way specified in the ffmpeg wiki: How to speed up / slow down a video.
ffmpeg -i input.mkv -filter:v "setpts=0.5*PTS" output.mkv
setpts also supports expressions if you feel creative and want to speed up/ slow down based on a curve rather than a constant value.
Eg: -filter:v "setpts=gauss(T/100)*PTS"
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Closed 10 years ago.
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how to decode the AAC format audio file(i.e. 1.aac) into pcm or wav file with ffmpeg command?
Question fit for superuser.com.
Here is your answer
ffmpeg -i input.aac out.wav
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any one can give me a hind how to split video (and can be played in separeat parts) ,by split here I mean to split it to 4 parts for example and each part can be running (paying)
You could try using ffmpeg with the -ss option to seek to a point in the video and then use -vframes or -t to extract a specific number of frames or seconds, respectively.
See http://ffmpeg.org/ffmpeg-doc.html