VB.net + ActiveX problem: Length property NULL

[hueen]

Hey,

I am using the VLC activeX plugin in a vb.net project and it basically works just fine, except for: The Length property always returns 0 (NULL, zero). In contrast, Position works fine.

How can I get it to work?

I am trying to capture the current video frame as an image. I wanna use either ffmpeg or vlc command line for that. Neither of both can use percentage positions, which is the output of the activex Position property. If I now had the Length, I could calculate my position in (milli)seconds.

Maybe someone has another tip on how to achieve this?


My code that plays a video:

Code: Select all

Dim MRLstring As String = tab1_dirlistbox.Path + "\" + tab1_filelistbox.SelectedItem tab1_AxVLCPlugin.addTarget(MRLstring, Nothing, AXVLC.VLCPlaylistMode.VLCPlayListReplaceAndGo, 0) tab1_AxVLCPlugin.play()

tab1_AxVLCPlugin.Position always returns the position in percent
tab1_AxVLCPlugin.Length always returns NULL


Thanks alot for any help!

[Quovodis]

this is probably due to the type of media you are using

[Tappen]

Are you playing an Mpeg Transport Stream file (.ts or .tp) file? I'm afraid Vlc doesn't calculate the length for media types like this even when they're in file form.

[hueen]

The files are mpg encoded with ffmpeg from vob files.

I just tested with vob files directly and it actually works. I will test some more with different file types at some point, but for now I only need to have vob files working anyway. Thanks for the tips.

[Tappen]

Make sure they're mpeg PS (program stream) encapsulated, rather than mpeg TS (transport stream) encapsulate, if you want to see the Length in Vlc.

[hueen]

Make sure they're mpeg PS (program stream) encapsulated, rather than mpeg TS (transport stream) encapsulate, if you want to see the Length in Vlc.

Can a vob file ever be mpeg TS?

[Tappen]

A vob file is a vob file. When you transcode (Save/Stream) from vob to mpeg you get to set the encapsulation, TS or PS or whatever. I was just asking which you'd picked.

If you want to do a really good clean job of combining multiple vob files into a single mpeg PS file use VideoRedo. I know it's $50 but it's the only non-free video app I use or recommend, it's that good.