| Printable Version of Topic
Click here to view this topic in its original format |
| Unofficial VirtualDub Support Forums > Advanced Video Processing > Wrong Audio Speed |
| Posted by: GeoSv Oct 26 2010, 05:54 PM |
| You know what I mean by speed. Audio plays slower, and is longer than video. I get this when capturing and also when converting video, sometimes. Don't have exact study of all situations but often involves divx. Can this be caused by choosing a different frequency sampling rate like 32kh, and VD treats it as if it's 48 or something? I just spent 2 days converting a movie and the audio is a failure. Luckily I have TotalRecorder and can alter things. Are there rules that divx must only have certain audio specs? As for capturing, I know something else is needed to co-ordinate audio with video. |
| Posted by: -SPM-Mad Dec 25 2010, 03:46 PM |
| You can choose the audio-codec indipendently from the video-codec. So generally DivX should not care about your samplingrate, but your audiocodec might care! Infact, VD lays out the data as even and sorted as possible and very often such sync-problems fall back to buggy video/audio codecs or capture drivers. The videos that already run ahead of the sound you can fix by opening them, Video-Framerate -> 'Change so that audio and vidoe duration match'. And select 'Direct Stream Copy' for video. Ofcourse, you will get odd framerates which are not a problem on a PC, but could cause problems on mobile players or HTPC thingies. You could also instead of changing the framerate using Audio->Full Progressing *-> Advance filtering and add stretch filters, trying to manually match audio. Tho, then you have to recompress the audiostream by choosing a new codec which might result in loss of quality depending on the bitrate you choose. If the capture-device skrews up, you could try different resolutions while capturing. Sometimes these can cause it to drift off. Generally something that needs some experimenting. If you have found out something or have more specific question, feel free to post again. Greetings and merry xmas Michael |