I have an image and a video (same width). I now want to use ffmpeg to add the image above the video. Google and other SO threads the use of the vstack filter_complex tag, which works great - except that it puts the image under the video.
I've tried putting the image first and then the video, but this doesnt work. I've also tried giving the vstack command reverse inputs, but also didnt work!
The video may also contain audio which I would need to keep.
See code below:
// Works, but puts image below video (instead of above)
ffmpeg -i test.mp4 -i text.png -filter_complex vstack result.mp4
// Doesn't work at all
ffmpeg -i test.mp4 -i text.png -filter_complex '[1:v][0:v]vstack' result.mp4
// Doesn't work at all
ffmpeg -i test.mp4 -i text.png -filter_complex '[1:v][0:v]vstack=inputs=2[v]' -map '[v]' -map 0:a result.mp4
Google / SO did not yield any tips on how to achieve this so far. Do you know a solution?
Use
ffmpeg -i test.mp4 -i text.png -filter_complex '[1:v][0:v]vstack' -c:a copy -pix_fmt yuv420p result.mp4
Videos and images can have different pixel formats. When the various inputs to a stack filter don't have the same format, the filter picks the format of the first input and converts all other inputs to that format. However, some video players don't support a wide variety of formats. yuv420p is the widely supported format and so the command above forces the output to that one. Audio, if present in the MP4, will get carried over.
ffmpeg -i test.mp4 -i text.png -filter_complex '[1:v]format=yuv444p[img];[img][0:v]vstack' -c:a copy -pix_fmt yuv420p result.mp4
Related
In the below example, I need to render video with video time duration(i.e mp4)But this causes video execution to an infinite loop.
ffmpeg -i v.mp4 -stream_loop -1 -i w.webm -vcodec libvpx-vp9 -filter_complex overlay -y output.mp4
It should also work with vice versa
ffmpeg -stream_loop -1 -i w.webm -vcodec libvpx-vp9 -i v.mp4 -filter_complex overlay -y output.mp4
For the above command, the output video should be rendered till mp4 time duration.
Please help me.
Use overlay=shortest=1
See the overlay filter documentation for more info.
I am overlaying a video on top of an image.
Using this command:
ffmpeg -i image.png -i input.mp4 -filter_complex "[0:v][1:v] overlay=10:10:enable='between(t,0,38)'" -pix_fmt yuv420p -c:a copy output.mp4
I understand the overlay=10:10 is the positioning but I can't seem to work out how to resize the overlay video (input.mp4).
I think I need to use scale but not sure how to.
Any help on scaling the overlay video would be appreciated!
With filter_complex you can combine commands and make named outputs
Try something like this:
ffmpeg -i image.png -i input.mp4 -filter_complex "[1:v]scale=320x240[scaled_v];[0:v][scaled_v] overlay=10:10:enable='between(t,0,38)'" -pix_fmt yuv420p -c:a copy output.mp4
Just change resolution to what you need instead of 320x240.
If you need image overlay on top of video, swap [1:v] and [0:v]
I am trying to create a video from still images using ffmpeg. The command I use to do this is
ffmpeg -y -r 3 -i input_images%03d.png -c:v libx264 -vf fps=24 -pix_fmt yuv420p output.mp4
However, I would like to overlay this video on still image, without creating a video of the still image first. So, for example, if I have the following images
[still, frame1, frame2, frame3]
I'd like a command to create a video of frame1, frame2, and frame3 overlayed on still.
all with one command. Is there a way to do this?
I've looked at several answers to related problems (e.g., Add image overlay on video FFmpeg) but they don't answer my question, exactly.
Use
ffmpeg -framerate 24 -i still.png -framerate 3 -i input_images%03d.png -c:v libx264 -filter_complex "overlay=x='(W-w)/2':y='(H-h)/2'" -pix_fmt yuv420p -y output.mp4
I'm trying to use FFmpeg to generate the following from a local mp4 file:
A copy of the original video with no audio
A copy of the original video with audio but without visuals (a black screen instead). This file also needs to be in mp4 format.
After reading through the documentation I am struggling to get the terminal commands right. To remove the audio I have tried this command without any success:
ffmpeg -i file.mp4 -map 0:0 -map 0:2 -acodec copy -vcodec copy
Could anyone guide me towards how to accomplish this?
Create black video and silent audio
Use the color and anullsrc filters. Example to make 10 second output, 1280x720, 25 frame rate, stereo audio, 44100 sample rate:
ffmpeg -f lavfi -i color=size=1280x720:rate=25:color=black -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -t 10 output.mp4
Remove audio
Only keep video:
ffmpeg -i input.mp4 -map 0:v -c copy output.mp4
Keep everything except audio:
ffmpeg -i input.mp4 -map 0 -map -0:a -c copy output.mp4
See FFmpeg Wiki: Map for more info on -map.
Make video black but keep the audio
Using the drawbox filter.
ffmpeg -i input.mp4 -vf drawbox=color=black:t=fill -c:a copy output.mp4
Generate silent audio
See How to add a new audio (not mixing) into a video using ffmpeg? and refer to the anullsrc example.
To remove the audio you can use this:
ffmpeg -i file.mp4 -c copy -an file-nosound.mp4
notice the -an option
-an (output)
Disable audio recording.
To keep audio but "replace" the video with a black screen, you could do this:
ffmpeg -i file.mp4 -i image.png -filter_complex overlay out.mp4
image.png is a black wallpaper that is placed on top of the video, but there should be better ways of full removing the frames, you could either extract the audio and later create a new video with the audio as a background
I want asymmetrical side by side video with resolution 1920x1080. The first video has bitrate 1mb/s and the second video has bitrate 500kb/s. Both videos have the same resolution 1920x1080 and encoded h.265, container mp4.
I used ffmpeg code:
ffmpeg -i leftvideo.mp4 -i rightvideo.mp4 -filter_complex "[0:v] scale=iw/2:ih, pad=2*iw:ih [left]; [1:v] scale=iw/2:ih [right]; [left][right] overlay=main_w/2:0 [out]" -map [out] -c:v libx265 output.mp4
It works well but I want the resulting video quality while keeping. I don't want re-encoded.
Is it possible the two videos change resolution (960x1080) and together packed into container mp4?
EDIT: or another method?
Using ffmpeg
You are required to re-encode if you want to use filters in ffmpeg, but if you want to "keep the quality" you can use a lossless output:
ffmpeg -i left.mp4 -i right.mp4 -filter_complex \
"[0:v]scale=iw/2:ih[l];[1:v]scale=iw/2:ih[r];[l][r]hstack" \
-c:v libx264 -qp 0 output.mp4
The resulting file size may be huge. If this is not acceptable you can try a "visually lossless" output by changing -qp 0 to -crf 18.
You did not provide full details about your inputs, and did not mention audio, so I assumed you are not concerned with the audio.
You did not provide the complete console output from your command so I assumed your ffmpeg is new enough to use the hstack filter.
Using ffplay
Another option is to just use your player to play side-by-side and not even deal with re-encoding. Example using ffplay.
ffplay -f lavfi "movie=left.mp4,scale=iw/2:ih[v0];movie=right.mp4,scale=iw/2:ih[v1];[v0][v1]hstack"