I have a video, recorded at 7 fps. It's 17 seconds long and has 122 frames.
I want to keep all frames but show them 1 per second, I want the same video to last 122 seconds. I don't want to lose information, but I also don't want the file size to increase.
How can I do that? All the ffmpeg options I see change the frame rate but keep the duration or create/drop frames.
You want to slow down your video without reincoding your video to (possibly) keep the file size. You must strip the timestamps by exporting the video to a raw bitstream format:
ffmpeg -i input.mp4 -map 0:v -c:v copy -bsf:v h264_mp4toannexb raw.h264
and than remux it with:
ffmpeg -fflags +genpts -r 1 -i raw.h264 -c:v copy output.mp4
-r 1 sets the framerate to 1.
Related
I have more than a thousand images that I want to transform into a 3 minutes video. I tried using this line ffmpeg -r 30 -i "E:/White-box-Cartoonization/test_code/cartoonized_images/$flower%03d.bmp" -c:v libx264 -pix_fmt yuv420p out.mp4 it worked but creates only a 5 seconds video. What do I need to do to turn it into a full length 3 minutes video?
If you have 1250 images and want an output duration of 180 seconds:
ffmpeg -framerate 1250/180 -i input%03d.bmp -c:v libx264 -vf format=yuv420p output.mp4
This example results in a frame rate of 6.94. Some players can't handle such low frame rates. If your player does not like it then add the -r output option to make a normal output frame rate. ffmpeg will duplicate the frames but the output will look the same.
ffmpeg -framerate 1250/180 -i input%03d.bmp -c:v libx264 -vf format=yuv420p -r 25 output.mp4
For 3 minutes of video at 30 frames per second (-r parameter) you'd need 30*60*3 images: 5400 images.
Your source parameter specifies there would be only 3 digits, so you have a maximum of 1000 source images:
$flower%03d.bmp => $flower000.bmp .. $flower999.bmp
1000 images at 30 frames per second should give about 30 seconds of video ... if you actually have $flowerxxx.bmp files.
You might need a 4th digit in there somewhere.
$flower%04d.bmp
Using avconv (or even ffmpeg, so I can use as a reference), how can I create a time lapse video by taking only anchor/reference frames from another video? Most information I find is on how to create a time lapse video by combining images, and I'd like to do it by extracting frames from a video. Say, if a video is 30 seconds long at 30 FPS, I'd like to take 60 out of those 900 frames (900/60 = every 15 seconds) to produce a 2 second video.
To take every 15th frame, use
ffmpeg -i in.mp4 -vf select='not(mod(n,15))',setpts=N/FRAME_RATE/TB out.mp4
Another method is to use the framestep filter
ffmpeg -i in.mp4 -vf framestep=15,setpts=N/FRAME_RATE/TB out.mp4
I had a H264 video from a camera and after lots of attempts found following command that produce 16x faster video with good result and 60 FPS (option -r) that is good for the YouTube timelapse
ffmpeg -i video.avi -r 60 -filter:v "setpts=0.0625*PTS" -vcodec libx264 -an timelapse.avi
You can check the result here https://www.youtube.com/watch?v=azhRqKQ7kCU
Since you are asking for 1/15 frame it will be 1/15 ~= 0.06667 with 30 FPS result video you will need command
ffmpeg -i video.avi -r 30 -filter:v "setpts=0.06667*PTS" -vcodec libx264 -an timelapse.avi
I have 10 jpg files (image0.jpg, image1.jpg, image2.jpg ... image9.jpg) and one .mp3 and I'm trying to create a video but I can't get it to show more than the first 3 images in the output.
I played with the output -r option and for example if I change it to 30 it shows all of them but very fast so the whole video plays for under a second.
This is my code:
ffmpeg -i image%d.jpg -i audio.mp3 -r 1 -c:v libx264 -tune stillimage -c:a aac -strict experimental -b:a 192k -r 1/5 -pix_fmt yuv420p -shortest out.mp4
What am I doing wrong ?
The image file demuxer by default uses a frame rate of 25 fps if you do not tell it otherwise. Since you used -r 1/5 as an output option the frame rate will be converted resulting in duplicated or, as in your case, dropped frames to compensate. To change this use -framerate as an input option (this is a private option of the image file demuxer):
ffmpeg -framerate 1/5 -i image%d.jpg output
Some crappy players may not like a "non-standard" frame rate, so you can add an output frame rate to change it while keeping the "timing" of the input:
ffmpeg -framerate 1/5 -i image%d.jpg -r 25 output
trying to get my head around ffmpeg to create a slideshow where each image is displayed for ~5 seconds with some audio. created a bat file to run the following so far:
ffmpeg -f image2 -i image-%%03d.jpg -i music.mp3 output.mpg
It gets the images and displayes them all very fast in the first second of the video, it then plays out the rest of the audio while showing the last image.
I want to make the images stay up longer (about 5 seconds), and stop the video after the last frame (not playing the rest of the song), are either of these things possible? i could hack the frame rate thing i guess by having hundreds of the same image in order to keep it up longer, but this is far from ideal!
Thanks
The default encoder for mpg output, mpeg1video, is strict about the allowed frame rates, so an input and an output -r are required:
ffmpeg -r 1/5 -i image-%03d.jpg -i music.mp3 -r 25 -qscale:v 2 -shortest -codec:a copy output.mpg
The input images will have a frame rate of 1 frame every 5 seconds and the output will duplicate frames to reach 25 frames per second.
-f image2 is generally not required.
-qscale:v can control output quality. A sane range is 2-5.
-shortest will make the output duration the same as the shortest input duration.
-codec:a copy copy your MP3 audio instead of re-encoding.
MPEG-1 video has more modern alternatives. See the FFmpeg and x264 Encoding Guide for more info.
Also see:
* FFmpeg FAQ: How do I encode single pictures into movies?
* FFmpeg Wiki: Create a video slideshow from images
You could use the filter fps instead of output framerate
ffmpeg -r 1/5 -i img%03d.png -i musicfile -c:v libx264 -vf fps=25 -pix_fmt yuv420p out.mp4
This however skips the last image for me strangely.
I have a GIF image. I am trying to convert it to MP4.
ffmpeg -f image2 -r {delay_time_of_gif_between_each_frame}/1 -i temp/%05d.png -vcodec libx264 video.mp4
This MP4 is not running at the same speed when compared to the original GIF. How do I make it to run with the same speed?
It seems I am making mistakes with the -r property. I played with it but don't get anything useful. I even removed it. Still it isn't working.
If you already know the time of delay between subsequent frames, then you need to take the inverse of it to convert it to a frame rate. For example, if the time between each frame is 40ms (or 0.04s), then the inverse would be 1 divided by 0.04, thus 25 fps.
You can not simply divide the time between frames by 1, since division by 1 will give you the same result as before.
So, try either of these again:
ffmpeg -f image2 -r 1/0.04 -i temp/%05d.png -c:v libx264 out.mp4
ffmpeg -f image2 -r 25 -i temp/%05d.png -c:v libx264 out.mp4
Note that the default input frame rate for image2 is 25 anyway, but this was just for illustration.
Also, you can change the frame rate of the output video as well, by putting -r after the input file, which should make a difference.
ffmpeg -f images -i temp/%05d.png -c:v libx264 -r 25 out.mp4
Although this question is somewhat older:
Current versions of ffmpeg automatically determine the delays between the frames according to the information in the gif images, so no need to set the frame rate in the command.