DIVx 5.1.1 audio delay

[madhatter300871]

Hi all

Set up my PC as a PVR and Im pretty impressed.

Windows XP, Hauppaugge Win TV go (881 chip), a few DVD authoring/ripping progs, DIVx codec 5.1.1.

Video quality is exceptional, capturing 720x288 at 4000KB/s using DIVx 5.1.1 codec.

PROBLEM: There is an audio delay on playback....... sometimes. Im using Power DVD to play back.

If I capute using MPEG1 2Mb (standard WIN TV SoftPVR setting) there is no audio delay. I do think the problem is with DIVx

HELP PLEASE !!!!!

Many thanks.

Chris.

[UncasMS]

you could face this problem:

when capturing with a codec like divx capturing device might skip frames when it simply cannot cope with the speed it is supposed to capture

i.e. the capturing process is not as fast as the incoming stream

your hardware may be a little to weak to compress video AND (???) audio on the fly

are you compressing the audio to mp3 or do you have it saved uncompressed to pcm/wav?

try compressing to divx but NOT using an audio-compression like mp3 - go for wav instead

if this solves the async problem you should capture with an uncompressed audio stream and have this audio compressed after capturing via virtualdubmod or other routines

[madhatter300871]

DIVx doesn't skip any frames, I chose 720x288 4MB/s after much testing. Also, as far as I am aware dropped frames are not just missed out, they will appear as black frames (or some other form of padding out the video stream).

The hardware is happily encoding on the fly. Incidently, its only when i increase horizontal resolution to 576 (non interlaced) that frames are dropped (and alot of them). So, quite happy I am operating within the limits of my hardware.

I don't compress the audio, I save it as uncompressed PCM, 44KHz, 16bit.

If I save the file as an AVI, completely uncompressed, (gigantic file size !!!) then no audio delay is present.

What file system do people use on the storage drive ? NTFS or FAT32 ?
How often do you defragment ?
Do any tools exist for ensuring data is streamed to the disk sequentially all of the time?
Is the problem one of streaming as opposed to encoding ?

Machine spec is 1.3GHz AMD, 756MB PC133 DIMM, 2 x 40GB hard drives (one used for storage of recordings only), both on seperate IDE channels.

Cheers.

Chris.