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1 | JPEGTOAVI | ||
2 | by Phillip Bruce | ||
3 | |||
4 | |||
5 | I. Introduction | ||
6 | |||
7 | In the tradition of the Unix computing philosophy, here is | ||
8 | yet another operator that does one simple task, namely the | ||
9 | creation of an AVI MJPEG file given a list of JPEG/JFIF files. | ||
10 | |||
11 | I had some difficulty in performing this extremely simple task | ||
12 | in Linux, mostly because it is so simple and all of the existing | ||
13 | code to do it lie at the bottom of complicated and more ambitious | ||
14 | projects--e.g. xawtv, avifile, etc. I then had to waste | ||
15 | time reading M$ docs and xawtv source to find out how to do it. | ||
16 | |||
17 | |||
18 | II. Installation | ||
19 | |||
20 | The code is pretty basic, and so it should be pretty easy to | ||
21 | install: "make all" compiles the program, "make install" | ||
22 | installs it. If you want the files to reside in some directory | ||
23 | besides /usr/local/bin and /usr/local/man, edit "Makefile". | ||
24 | |||
25 | |||
26 | II. Usage | ||
27 | |||
28 | There are three basic modes of operation: | ||
29 | |||
30 | 1. jpegtoavi per_usec width height img1 [img2 ... imgN] | ||
31 | 2. jpegtoavi -f fps width height img1 [img2 ... imgN] | ||
32 | 3. jpegtoavi -fsz img1 [img2 .. imgN] | ||
33 | |||
34 | The first two print an AVI to STDOUT using the width and height | ||
35 | parameters and the images named in chronological order. (No | ||
36 | checks are made on the validity of the JPEG/JFIFs or their | ||
37 | dimensions.) The first mode specifies the frame rate in | ||
38 | terms of the period in microseconds for each frame, whereas | ||
39 | the second specifies frames per second. | ||
40 | |||
41 | The third mode was added to give size hints during the transfer | ||
42 | of AVIs without the use of a temporary file. Instead of | ||
43 | generating the AVI it outputs the size in bytes that of the AVI | ||
44 | that could have been generated. | ||
45 | |||
46 | |||
47 | III. Contact, Bug Reports, and Suggestions | ||
48 | |||
49 | Send them to me at dI77IHd@yahoo.com \ No newline at end of file | ||