Comments on Aaquagua!: How to Extract Video Still Frames with MPlayer

2011-10-21T23:52:14.015-04:00

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I just add dll to my project and copy tour code to...

2011-07-26T01:29:13.234-04:00

I just add dll to my project and copy tour code to the project.......but it produce nothing.........what should i do now please help me

I am having trouble finding the exact executables ...

2010-06-02T10:34:12.323-04:00

I am having trouble finding the exact executables and codacs from the mPlayer website, it's pretty confusing. Can you zip everything needed together into a .zip file and post a download link, that way I will be sure to have the right files you created this tutorial using :)

Thanks a million, happy coding!

Vladimir, thanks! The mplayer.exe only takes a rel...

2009-12-27T20:04:38.850-05:00

Vladimir, thanks! The mplayer.exe only takes a relative directory for the jpeg output. That's why (if you look at the source for the wrapper) if you want a different output directory, the images are first generated in a relative temp directory and then moved to the final destination.

Boyan - very helpful code. Thank you! It there a w...

2009-12-27T14:42:13.751-05:00

Boyan - very helpful code. Thank you! It there a way mplayer.exe can take direct output path as a parameter for jpeg:outdir?

Yup, the first one works. However for a 37 seconds...

2009-11-04T19:42:14.758-05:00

Yup, the first one works. However for a 37 seconds movie, I ended up with 949 images, a bit crazy.

Thanks for the information I am wondering if this ...

2009-11-04T19:31:24.200-05:00

Thanks for the information
I am wondering if this command would work
mplayer input.avi -vo jpeg:outdir=dirname

or would this be better
mplayer -ss 00:00:00:01 -vo jpeg input.avi

I will be working with an avi file

I found the first command on the mplayer wiki page

You can but with some modifications to the command...

2009-11-04T18:02:01.898-05:00

You can but with some modifications to the command line parameters for mplayer.

Hi all I just found this wrapper and am wondering ...

2009-11-04T16:55:36.129-05:00

Hi all
I just found this wrapper and am wondering can I use this to get all the frames from a video file.

Thanks for any information.

Contact me off here at boyank at google or the cha...

2009-07-31T12:36:21.537-04:00

Contact me off here at boyank at google or the chat, maybe I can help you if you haven't figured it out.

Can you give the time seek one multiple times, so ...

2009-07-30T11:15:09.562-04:00

Can you give the time seek one multiple times, so give it a comma separated list of all frames every 1' or something? I tried that method before but a problem I had was that it would seem to lock up and get super slow if I tried to call mplayer for each frame separately.
Thanks!

The only other suggestion I have is try the opposi...

2009-07-29T20:30:38.612-04:00

The only other suggestion I have is try the opposite method of capture. The wrapper has two methods: captureFramesWithInterval and captureFramesWithTimeSeek, so try the one you haven't used yet.

Yes it is actually quite consistent with all of th...

2009-07-29T19:59:09.446-04:00

Yes it is actually quite consistent with all of the files I have, it is almost always the same offset. Do you know a way around this so that the offset doesn't accumulate? It's strange that it's basically treating my "60" argument like "63" or so for the step size.
Thanks!

What you are experiencing is most likely due to th...

2009-07-29T19:51:08.856-04:00

What you are experiencing is most likely due to the key frames in the file. The way the stepping works: first skips to the position and then captures the frame. However, if there is no key frame at the position, it doesn't actually go directly to that frame but to the next key frame. That's the best way I can explain the behavior you are seeing. Have you tried a different file?

Hi I've been working with this and seem to run...

2009-07-29T18:47:40.160-04:00

Hi I've been working with this and seem to run into a strange bug - I'm trying to capture a frame every 60 seconds, but it seems to capture it every 62 seconds or so?? So by the end of a video, it loops around and for an hour video, the last two frames are from the start.
Have you run into this? Any known fix??

ex code:
mplayer "file.mp4" -nosound -really-quiet -vo "jpeg:outdir=directory" -vf "scale=320:240" -ss 0 -sstep 60 -frames 47

(For a 46:40 long video)
Thanks for the help

So I was curious to see if I could get mplayer to ...

2009-05-15T23:41:00.000-04:00

So I was curious to see if I could get mplayer to dump all frames from any segment.

With this wrapper it looks like its limited to int seconds. However, mplayer will accept something a little more granular:

mplayer -ss 00:00:00:01 -frames 72 -vo png input.mov

This will save the first 72 frames (at 24fps the first 3 seconds) as png from the begining.

It doesn't look like the wrapper supports this, but should be fairly trivial to add. Thought I'd pass on the info if anyone was interested.

I've updated the wrapper DLL and source code, that...

2009-04-17T12:13:00.000-04:00

I've updated the wrapper DLL and source code, that should fix the issues.

Okay... So I created a new project and made the re...

2009-04-17T11:14:00.000-04:00

Okay... So I created a new project and made the reference to the DLL file in the Bin\Debug folder of the mPlayerWrapper...

I use this code:

Imports System.IO

Public Class Form1

Private Sub Btn_Grab_Image_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_Grab_Image.Click

Dim mPlayerInstance As New mPlayerWrapper
mPlayerInstance.captureFrames("C:\ImageGrabber\Video\Lake.wmv", "C:\ImageGrabber\Image\")

End Sub
End Class

I get this error message when I click the button:

The path is not of a legal form.

Any ideas?

It could be your file or the lack of codecs. Email...

2009-04-03T15:26:00.000-04:00

It could be your file or the lack of codecs. Email me (boyank at gmail) or talk to me on the chat here if you want me to help you.

I did everything as you explained.
The getVideo...

2009-04-03T14:34:00.000-04:00

I did everything as you explained.
The getVideoProperties method works fine, but the captureFrames*** methods create no files on disk (and produce no errors at the same time). What can be the reason?

Thank you,
Alex.

Can you post the code that is trying to extract th...

2009-02-03T12:02:00.000-05:00

Can you post the code that is trying to extract the frames? Either here or contact me over the chat widget and maybe I can help you.

This is perfect for a project I am doing but no ma...

2009-01-30T05:39:00.000-05:00

This is perfect for a project I am doing but no matter what method I use I can't seem to capture faster than once every 30 seconds. I would like to capture every 5-10 seconds. Also I get an exception (Input string not in correct format) . . Any Thoughts?

You would need to use the time interval method but...

2008-12-11T01:03:00.000-05:00

You would need to use the time interval method but since you want 200 frames, first get the frames per second from the file info (getFileInfo function) and calculate the time interval for 200 frames.

What option could I use for capturing 1 frame ever...

2008-12-10T22:31:00.000-05:00

What option could I use for capturing 1 frame every 200 frames?