If the JPEG encoding step is too performance intensive, you could always store the frames uncompressed as BMP images:
ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp
This also has the advantage of not incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to encode.)
Answer from Multimedia Mike on Stack OverflowIf the JPEG encoding step is too performance intensive, you could always store the frames uncompressed as BMP images:
ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp
This also has the advantage of not incurring more quality loss through quantization by transcoding to JPEG. (PNG is also lossless but tends to take much longer than JPEG to encode.)
Came across this question, so here's a quick comparison. Compare these two different ways to extract one frame per minute from a video 38m07s long:
time ffmpeg -i input.mp4 -filter:v fps=fps=1/60 ffmpeg_%0d.bmp
1m36.029s
This takes long because ffmpeg parses the entire video file to get the desired frames.
time for i in {0..39} ; do ffmpeg -accurate_seek -ss `echo $i*60.0 | bc` -i input.mp4 -frames:v 1 period_down_$i.bmp ; done
0m4.689s
This is about 20 times faster. We use fast seeking to go to the desired time index and extract a frame, then call ffmpeg several times for every time index. Note that -accurate_seek is the default
, and make sure you add -ss before the input video -i option.
Note that it's better to use -filter:v -fps=fps=... instead of -r as the latter may be inaccurate. Although the ticket is marked as fixed, I still did experience some issues, so better play it safe.
How to extract frames from a video using ffmpeg? - Video Production Stack Exchange
How can i extract all frames from a video on a specific folder?
Extract specific video frames - Video Production Stack Exchange
batch file - Extract all video frames as images with FFMPEG - Stack Overflow
Use the select filter:
ffmpeg -i <input> -vf "select=eq(n\,34)" -vframes 1 out.png
counting starts at 0, so 35th = n value of 34.
It should be noted that the select filter will decode the video up to the selected frame, so this can be quite slow if you are trying to fetch a frame one hour into a video.
Two quick-and-dirty ways:
Use the FFmpeg executable with the seek option. You'll need to convert to a time first, e.g. if I want frame 150 and my video is 29.97 FPS the command will be ffmpeg -ss 00:00:05.01 -i myvideo.avi -frames:v 1 myimage.jpg. This might be slightly inaccurate. To seek by exact frame you'd need to use the FFmpeg library with C++.
Another 'hacky' way is using VLC media player. Check menu View -> Advanced controls. Pause video and click the Frame-by-frame button 34 times.
» npm install ffmpeg-extract-frames
I want to extract all the frames of a video in it's original quality in a folder.
After google i see you can make FFMPEG to extract frames "every x amount of seconds" or extract 60 frames per second even if the video plays at 30 frames per second.
But what i want is to extract all the frames that originally exist in a video (no extra frames like 60 per second when the video originally has 30), without lose quality, in a determined output folder (not in the ffmpeg folder).
I will re-join them all later into a video so i don't want to lose quality.
What kind of syntax should i use?
To extract frame # x through y, use
ffmpeg -i in.mp4 -vf select='between(n\,x\,y)' -vsync 0 frames%d.png
You can also use:
ffmpeg -ss XXX -i input.mp4 -vframes 1 output.png
where XXX is the time in seconds. If you know which exactly frame you want to extract you can calculate the XXX by multiplying the number of the wanted frame * frame duration which is 1/fps.
Please also note that since H.264 is using I, P and B frames it would be best if you first decode your video to some intra-frame codec or raw. You can easily do that by:
ffmpeg -i input.mp4 -vsync 0 output.y4m
And then you can extract the desired frame. But y4m is a format with no compression which means that the output file will be huge. You can also use ffv1 to do that since it is lossless codec, but make sure you use -g 1 option, since you need only I-frames at the output.
Use
ffmpeg -i "%1" frames/out-%03d.jpg
A sequence of image files don't have a framerate. If you want to undersample the video file, use -r before the input.
Edit:
ffmpeg -i "C:\Applications\FFMPEG\aa.mp4" "frames/out-%03d.jpg"
Try:
ffmpeg -i file.mpg -r 1/1 $filename%03d.bmp
or
ffmpeg\ffmpeg -i file.mpg test\thumb%04d.jpg -hide_banner
Note:
- to change framerate before
-i, enter-framerate. To specify framerate for output after-ienter-r -filter:v -fps=fps=...or-vf fps=...is more accurate than-r
eg.
ffmpeg -i myvideo.avi -vf fps=<NO. of images>/<per no. of seconds> img%0<padding No. of digits>d.jpg
