Cut part of High Definition Video

[Bruno AUgusto]

Continuing my quest to create a home-made DVD with Anime / Cartoon, I need to cut part of the High Definition video I have.

This is to have in a separate video file the Cartoon's vignette, to use it as animated menu in AVS2DVD, as suggested here.

One point to be considered, is I THINK it is a High Definition video. FLV Extract returned me a .264 file, which I could only open and perform some conversion with DGAVCDec, AVISynth and VirtualDub (together).

The resulting file was impressive 15 GB. It was a hard task to me and it was not good anyways, since the FLV file has less than 200 MB.

OK?

In past, I tried to make this same task using VirtualDub and a normal AVI file. But even I marking very precisely the start point, the final result did not respected my choices, keeping a few unwanted seconds before the point I marked.

So, some clarification about this would be great too.

[Baldrick]

You might be able to edit the flv lossless with avidemux, under video and audio choose copy. Save as mp4.

Or if you want to use virtualdub you must choose a compression for smaller file size, under video->compression. But if you are going to convert to a dvd later it's better to use a lossless format like uncompressed or huffyuv.

[Bruno AUgusto]

Alright.

I t took some time to understand the basics of the program (AVIDemux), and after a few crops I extracted the video.

But the resulting MP4 has some sort of lag. It's not running "softly" like the original movie.

What is the problem?

[poisondeathray]

You might as well your edits in the script. You have to resize to SD for DVD anyways, so you re-encoding is necessary

Divide it up using Trim() . Trim(200,500) would return frames 200-500 . You can use vdub or avspmod to preview (push f5), or play the avs in a mediaplayer to check sync

Depending on the source FLV, you might have to make other changes , like framerate for DVD, incl. audio e.g. resample to 48KHz , you might have to make it CFR for sync . If you post the mediainfo (view=>text) of the source , people might give you more specific help

e.g.

FFMpegSource2("video.flv", atrack=-1)
Trim(a,b) #a is the start point, b is the end point
Spline36Resize(720,480) #for NTSC DVD

[Bruno AUgusto]

Sorry, poisondeathray, I didn't understood your message. Remember, I'm very new in this world.

Well, I tried to do with AVIDemux and I was succeed in my task, but the output file has a little lag in the video.

As example, the initial seconds have a far away ice mountain view. In FLV it runs smoothly, in the MP4 (or AVI, MKV...) several little "gagging" are visible.

My hardware configuration is not very good, I know, but I can do several tasks perfectly. Is there any known issue about this or I would REALLY need a more powerful CPU to achieve my goal?

Maybe there is another software I can try. Another one different from this huffyuv, because it seems to run as VirtualDub Compression Mode and, even with FLVImporter plugin, still remaining my position about not-so-precisely marking points I experienced with VirtualDub,

Question: If I extract FLV contents I have a .264 Video and .AAC Audio. Is there a way to load them both together and do the same task? Maybe this lag vanishes, who knows...

I'm asking that because when loading FLV with AVIDemux I received an alert about H.264 using B-frames reference. I don't really know what is that, but there is a warning in this same box about loose frame accuracy. Maybe it is, at least, indirectly tied to the problem...

However, setting 'No' in this box, I had no problems, like crashes or something.