Extract image frames from an MJPG file - image

Question

I'm trying to extract image frames from a short clip of an IP cam. Specifically this clip.
http://db.tt/GQwu0nZ8
So, I'm trying to extract that frames with ffmpeg with this.
ffmpeg -i M00001.jpg -vcodec mjpeg -f image2 image%03d.jpg
I'm just getting only the first frame of the clip. How can I get the rest of frames? Can I use another tool to get that images?
Thank you

Answer 1

This may be too much but here's a short javascript program for Node.js https://nodejs.org/ that will strip all the readable frames out and save them as separate sequentially numbered jpg files in the current directory. Beware, even a short video clip can generate thousands of frames and the V8 javascript engine that Node uses is really fast so I recommend closing your file browser because it will hog resources trying to keep up.
If the video file is too large to create a buffer for, Node will issue an error and exit.
In that case the easiest thing to do would be to split the file into chunks with your shell utilities or a program like HexEdit. http://www.hexedit.com/
Rewriting this code to process the file asynchronously would fix that issue but writing asynchronous code still gives me anxiety.
var orgFile=process.cwd()+"/"+process.argv[2]; //Grab the video filename from the command line
var fs = require("fs"); //Load the filesystem module
var stats = fs.statSync(orgFile);//Get stats of video file
var fileSizeInBytes = stats["size"];//Get video file size from stats
var fdata=new Buffer(fileSizeInBytes);//Create a new buffer to hold the video data
var i=0;
var fStart=0;
var fStop=0;
var fCount=0;
fdata=fs.readFileSync(orgFile);//Read the video file into the buffer
//This section looks for the markers at the begining and end of each jpg image
//records their positions and then writes them as separate files.
while (i<fileSizeInBytes){
if (fdata[i]==0xFF){
//console.log("Found FF at "+i.toString);
if (fdata[i+1]==0xD8){
//console.log("Found D8 at "+(i+1).toString);
if (fdata[i+2]==0xFF){
//console.log("Found FF at "+(i+2).toString);
fStart=i;
}
}
}
if (fStart>0){
if (fdata[i]==0xFF){
if(fdata[i+1]==0xD9){
fStop=i+1;
}
}
if (fStart>0){
if (fStop>0){
fCount++;
fs.writeFileSync(orgFile+"."+fCount.toString()+".jpg",fdata.slice(fStart,fStop));
console.log (orgFile+"."+fCount.toString()+".jpg");
fStart=0;
fStop=0;
}
}
}
i++;
}
console.log ("Wrote "+fCount.toString()+" frames.");
If you save the above code as mjpeg_parse.js an invocation example would be:
Node mjepeg_parse.js videofile.avi

Answer 2

The command with ffmpeg works fine, but you need to specify mjpeg video as an input file. If M00001.jpg is a single jpg image, then you will get only one (the same) output image.