easy video encoding question

mynameisflorian · 08-10-2005, 02:05 PM

i have a series of images (anim0000.png, anim0001.png, anim0002.png . . . ) that i want to create a video clip out of. What is the easist way to do this?

thank you very much;
Florian

kencaz · 08-10-2005, 02:22 PM

Using MEncoder:

mencoder "mf://*.png" -mf fps=25 -o output.avi -ovc lavc -lavcopts vcodec=mpeg4

This will create an avi movie file "output.avi" of all .png files in your current directory..

KC

mynameisflorian · 08-11-2005, 08:52 PM

after some tweaking for video quality, it works great. The only problem is, is that the software intentionally skips frames (making the video jerky) and generates a .par file with a list of the frames:
anim0000.png
anim0001.png
anim0001.png
anim0003.png
anim0003.png
anim0005.png
anim0005.png
anim0007.png
anim0007.png
anim0009.png
anim0010.png

and, creates a .pat file that looks like:
IPpPpPpPpPPpPpPpPpPPpPpPpPpPPp...

how can i pass this info to mencoder?

thankyou very much
- Florian

kencaz · 08-11-2005, 08:57 PM

Not sure what your refering too... I have never had that particular problem... How do you mean jerky? maybe adjust the speed on output...

KC

mynameisflorian · 08-11-2005, 11:17 PM

Jerky, meaning that it jumps, skipping a frame or two. the software that outputs these images does not render if 2 consecutive frames are the same. Given the list of files(the .par file), how could i write a script to copy the files to make a smooth animation?

(for each line in the .par file):
"cp" + (space) + (contents of line) + (space) + "out" + (line#) + ".png"

I'm not shure exactly how to translate this into a working script, but that's what i want to do.

thank you,
Florian

kencaz · 08-11-2005, 11:33 PM

Sorry Florian, You lost me... forgive my ignorance but I still don't know to what you are refering... you have cancatenated your .png files to a video format... are you saying that there are some .png images missing from the output video...?

I just have not run into your specific problem... perhaps someone else has but I am at a loss...

KC

mynameisflorian · 08-13-2005, 10:34 AM

No, the images are missing from the source. Since it takes quite a while to render each frame, it will not render a frame if the two consecutive frames are the same. My question is, how would i write a script to either copy or link the missing png frames so that the encoder makes a smooth video.

Thank you,
Florian

P.S. I want to know how to write a script that, for each line of the .par file, it executes the following:
"cp" + (space) + (contents of line) + (space) + "out" + (line#) + ".png"

keefaz · 08-13-2005, 11:11 AM

I think you use a wrong fps, could you try in the image directory :

Code:

mencoder mf://*.png  -mf w=$width:h=$height:fps=12 -ovc lavc -o film.avi

(where $width and $height are the width and height of your images)

mynameisflorian · 08-17-2005, 04:57 PM

The framerate is not the issue. Source frames are missing. I need to know how to copy them so that the output animation does not jerk around.

thank you,
Florian