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| Unofficial VirtualDub Support Forums > Newbie Questions > Help! Playback And Export Problems |
| Posted by: spiralsupward Jul 2 2012, 04:10 AM |
| Hi guys! Hope you can help me. I was able to recover a damaged .avi file from a CamStudio crash (which happens whenever creating a file larger than 2 GB). The video and audio wound up as two separate temp files - the video seems to be fully recovered, but when it plays back in virtualdub, it appears slow and choppy. When I added the audio file, it was similarly choppy on playback. (It sounds fine when played on its own, before importing into virtualdub, so the issue is not with the audio itself - assuming the same for the video.) To compound the problem, when I try to save / export the file, it ends up UNGODLY huge - over 400 GB for a 2.3 GB file! I literally dont have space on my computer to save it! Is there any solution to these problems? Its a very important file to recover, any help would be appreciated! :-) Thanks! Chris |
| Posted by: Abrazo Jul 2 2012, 08:10 AM |
| Chris, you do not tell us: - what is the length of your video and - what is the resolution of it, but regarding the size of your output file it seems to be "uncompressed" and too heavy to play it fluently in VirtualDub. Normally in an AVI file, the audio as well as the video are in a "compressed" or also called "encoded" format. Depending on the resolution of the images (for example 720x404 or 1600x900 pixels) you will need less or more Megabytes of data per minute of video. What you should do in VirtualDub is choose a "codec" for - Video > Compression... (Xvid, DivX, x264, ... +/- > 2500kbps) and for - Audio > Compression... (MPEG Layer-3, ... +/- 128Kbit). With these settings do File > Save as AVI... to create a new "compressed" and "encoded" videofile. Normally when you will play this encoded resulting file with VirtualDub it should run smoothly. Let us know if that helps. Some "feedback" is always appreciated (so we know that we are not talking for the clouds). |
| Posted by: spiralsupward Jul 2 2012, 04:43 PM |
| Thank you, Abrazo! I dont appear to have those codec options. Under video / compression, I see uncompressed RGB, Cinepak codec by Radius (FOURCC code cvid), Intel IYUV codec (FOURCC code i420), Intel IYUV codec (FOURCC code iyuv), Microsoft RLE code (FOURCC code mrle) and Microsoft video 1 ((FOURCC code msvc). Those are my options, and none of them see to make a difference in playback. As for audio, I added the temp audio track using audio > audio from another file (the video got saved as two files for some reason when camstudio crashed - one is audio and one is video) and the footage plays with audio now - however the audio is equally choppy. Its not giving me the option for compression for audio. I am not overly concerned about the audio, because it plays OK outside of Virtualdub and I can always add it later. - The length of the video is 2.36GB and its 6 minutes long. - I dont know the resolution, how do I check? I agree the issue seems to be the file is just to heavy to play or export, but I cant find a way to effectively change any settings to alter the compression or export quality. Very frustrated! Thank you in advance for your help! Chris |
| Posted by: Abrazo Jul 2 2012, 07:07 PM |
| EDITED: Chris, When you open your videofile in VirtualDub it uses just the codecs that are needed to 'read' or 'decode' the audio and the video part of the file. Given the fact that your video is (probably) not compressed at all, no codecs are needed. But as long as you do not make a new and encoded file of it, it will not play as you would like it. What I propose is that - when your original videofile is open in VirtualDub - you should do a File > Save as AVI... to make a new compressed/encoded file of it. (Take care to choose "Full processing mode" in both the Video- and the Audio-menu.) That file will be far less in size (+/- 150 MB) than what it actually is (> 2 GB), and will normally play smoothly. For what concerns the resolution of the images, you can controle these via File > File Information... and look at Video Stream / Frame size. And for what concerns the "video for windows"-codec that you should use to encode the file, you will first have to install one of the available ones: - DivX : http://www.divx.com/en/software/divx-plus/codec-pack - Xvid : http://www.xvid.org/Downloads.15.0.html - x264 : http://sourceforge.net/projects/x264vfw/ After installation, the installed codec(s) will be available in VirtualDub via Video > Compression... and you will be able to set the bitrate (+/- 2500 kbps or higher). Also try to compress the audio (from other file...). Normally "MPEG Layer-3" should be available via Audio > Compression... So, give it a try. |