Delete Sound/Crop Video

[OG24]

is there any way to COMPLETELY delete the sound of off a AVI?

[redwudz]

Sure. Put it into VirtualDub, select the audio track and 'delete'. Then save out the audio and video with 'Direct stream copy'.

[OG24]

how do i select the audio track wut option is it under?

[redwudz]

That depends on the version of VD you are using. I use VirtualDub Mod most of the time as it seems to be better for handling audio, IMO. It also opens most MPEG and VOB files.

Anyway, with VDM, go to 'Streams>Stream list', just click 'Disable' on the audio file shown. Then 'OK'. It will be in 'Direct stream copy' mode as default unless you change it.

Under 'Video', select 'Direct stream copy', then under 'File', 'Save as...' Make up a new name if you don't want to overwrite the original. Then save the file.

[OG24]

thanx a lot! but also i would like to know y when i crop an AVI in VDM it always seems to be a bigger size isn't the size sopposed to be smaller i have a 680MB avi and when i crop it to make it smaller it goes over 3GB!!!!!! wut am i doing wrong?

[manono]

wut am i doing wrong?

You're reencoding it. Before saving select Video->Direct Stream Copy.

[redwudz]

If he's also cropping, he will have to re-encode. If so, you need to select a appropriate codec and settings. If you don't select a codec, VD will use uncompressed video by default, which will give you a huge file.

Check the original 'File information' in VD under 'File', or better, use Gspot 2.70 and it will give you somewhat easier to interpret info. Just use those settings with a somewhat higher bitrate to make up for conversion losses. Or with a codec like Xvid, use the 'Target quantizer' set at about 2. But the file will be bigger if you want to preserve the original quality.

[OG24]

y doesn't the XVID codec show on VDM i know its installed cause the video i have is an XVID and it plays fine

[manono]

Thanks, redwudz. I was reading it completely wrong, about still only removing the audio. Maybe I can redeem myself:

y doesn't the XVID codec show on VDM i know its installed cause the video i have is an XVID and it plays fine

Then something else is decoding it. You could play it without having the XviD codec installed. The solution, install XviD. Then look in the collection of codecs in VDubMod for XviD.

[OG24]

ok i found it! thanx u but after the cropping and re-encoding it looks really blocky? y is that?

[redwudz]

Yes, he added that in later in the thread.

BTW, OG24, I wouldn't expect the filesize to be much, if any smaller just by cropping, even if you use the original bitrate. And to preserve quality and make up for encoding losses, it will likely be a fair amount larger as you would want a higher bitrate. But give it a try and see how much loss you can tolerate, depending on the output size you want.

Another complication can arise from cropping, if you wanted to next convert it to MPEG as in a DVD. Then you would have to re-size the cropped frame back to a DVD compatible framesize or letterbox it.

EDIT:

y is that?

The re-encoding causes quality loss. Try increasing the bitrate. There is also a 'de-blocking filter that might help. http://www.compression.ru/video/deblocking/smartdeblocking_en.html

And you thought this would be easy. But it's a learning experience.

[OG24]

Thanx a lot Red ur a genius!