x264 and virtualdub

[Jalavera]

If you have an AVI file with the x264 codec, why the RESULTING FILE in virtualdub (if you set a start point and a end point and make a 'direct stream copy') IS unusuable or if it is, it's not cut on the edges I have selected?

[eb]

Starting point must I-frame

[Sharktooth]

No... starting point must be an IDR frame (that's also an I frame).
Remember AVC in AVI is a bit problematic... so you cant pretend too much from it.

[Jalavera]

No... starting point must be an IDR frame (that's also an I frame).
Remember AVC in AVI is a bit problematic... so you cant pretend too much from it.

Ok. But, how can I identify and IDR frame? :confused:

[bond]

Ok. But, how can I identify and IDR frame? :confused:
i think you cant in virtualdub(mod)!?

[Jalavera]

and with other software different of Vdub(Mod)?

[bond]

and with other software different of Vdub(Mod)?
the only way i know to find out where the idr frames are is to extract the stream to raw and than run the h264_parse tool from mpeg4ip on it

[Sharktooth]

Another way is to mux the video stream in a mp4 file, split it with mp4box, extract the splitted video stream and remux it in avi.
In that way you dont need to know whrere the IDR frames are.

[bond]

are you sure that raw -> avi muxing works with all streams?

[Sharktooth]

avc2avi was made for that reason. you can find it in the x264 thread :)

[Sirber]

Using avs2avi, I've got no problem so far.

[bond]

avc2avi was made for that reason. you can find it in the x264 thread :)
sure, but my question was if it works with all streams for sure?
eg multislice or b-pyramid ones

[akupenguin]

avc2avi will work with all main profile streams. It will not work with high or some of the extended profile features.

[bond]

thanks!

[stephanV]

uhm... IDR frames are just marked as key-frames... no need to do all sorts of crazy extraction. just use SHIFT + arrow keys