Linux: How to extract frames from a video? (lossless)

Question

I've read a few answers and articles on using programs like VLC, MPlayer, ffmpeg, etc., but none of the methods I've seen are "lossless." They don't capture every single frame. I want to extract each frame from a video as an image (100% quality, I don't want to lose any detail), so one could theoretically take those images and re-create the video file without being able to tell the difference from the original (excluding the lack of audio, of course).

Bonus points if I can specify a start and end time to grab frames from, so I don't have to crop the video file beforehand.

Solution 1

You can extract the frames as PNG, a lossless picture compression format. For example, to extract frames from the 5min mark to the 10min mark :

ffmpeg -ss 05:00 -i <input> -t 10:00 filename%05d.png

Solution 2

There are several tools that should be able to extract all frames from a movie file:

avconv
avconv -i file.avi -f image2 Out%00d.jpg

ffmpeg
ffmpeg -i input.file thumb%04d.png -hide_banner

This can also export BMP, which take much less processing time than PNG or JPG.

There is also a bash script called mov2frame.sh that tries to automate the FFMPEG extraction process.

Mplayer
mplayer -ao null -vo png input.file

or another option:

mplayer -nosound -vo png:z=9 my_file.mp4

VLC This media player apparently can export image sets using its filters, but seems troublesome unless it's your only usage or you have a portable version.

1. Create a folder to store your frames and copy the path to it. For Mac OSX/Linux users, this must be the full path (no ~).

2. Click Tools / Preferences in VLC.

3. Under “show settings”, click “all”.

4. Under “Video”, select “Filters”. Tick “Scene video filter”.

5. Expand “Filters” and select “Scene filter”,

6. Paste the path from earlier into “directory path prefix”.

7. Choose the fraction of frames to encode in the “recording ratio” box. 1/12 with output every 12, 1/1 will export them all

8. Click “save”.

9. Click Media / Open Video and find your video. Patiently let the whole thing play.

10. Click Tools / Preferences. Under “show settings”, click “all”. Under “video”, select “filters”. Uncheck “Scene video filter”. Click “save”. This is so that VLC won’t generate thumbnails the next time you play a video. link

There also appears to be some potential trouble with admin permissions on first program run:

sudo vlc [sudo] password for mint16: VLC is not supposed to be run as root. Sorry. If you need to use real-time priorities and/or privileged TCP ports you can use vlc-wrapper (make sure it is Set-UID root and cannot be run by non-trusted users first).

VLC also performs much better when extracting to BMP instead of PNG

Comments

[Elisa Cha Cha]

In order to possibly answer this some info about your ffmpeg version and the input file is required. Please show the complete console output of ffmpeg -i input.

[Ciro Santilli Путлер Капут 六四事]

Related: unix.stackexchange.com/questions/185877/…

[Caridorc]

I get the error Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

[Caridorc]

How can I reduce the framerate output using ffmpeg? Can I have for example only 2 images of frames per second?

[lapin]

ffmpeg outputs PNG8 files, which are not lossless, it's only 256 colors (same as GIF !! Only PNG24 are lossless. .bmp would be a lossless option for ffmpeg

[Matifou]

would you mind clarifying what %05d is? I see other use %00d ? Thanks!

[Rajib]

%05d is correct. It means number the files and use a 5 digit zero-padded naming convention.