converting 23.976fps DivX to 25fps VCD in TMPGENC

[drewid]

having trouble converting a divx which is 23.976fps to a PAL VCD .. the vcd is always jerking.. what can i do to smooth the stream?

[BlackAdder]

The best way is to speed up the audio and video. In virtual dub load the avi, then go to VIDEO/FRAME RATE. on CHANGE TO enter 25. Also, make sure DIRECT STREAM is checked under video. THen resave the avi. You'll also need to extract out the audio and speed it up using Cool Edit, or other prog. Somepeople have used AVISynth to do it in one step, but the audio always comes out desyched when I use that method.

[drewid]

thanks blackadder..
are there many steps in speeding up the audio with cooledit?
and would it be possible for you to list them



<font size=-1>[ This Message was edited by: drewid on 2001-08-13 20:27:44 ]</font>

[wildcatfan]

Ya know I always wondered why they sped up the audio/video instead of just doing a repeat of one of the fields in frame 12 and 24. Oh well, speeding them up is how actual pal dvd's are made as well I believe though.

[drewid]

well i think that your way of encodeding would still result in 25fps which would still make the audio go out of sync?

<font size=-1>[ This Message was edited by: drewid on 2001-08-13 20:26:09 ]</font>

[wildcatfan]

if your talking to me I don't encode that way I live in ntsc land. As far as I know there is NO way of doing what I said just throwing a what if out there.....the way I think the conversion from film to pal should be done, not the way it is. It would stay in sync however as that is how film is converted to 29.97 fps just more fields are repeated.

Michael

[willem]

I've posted a fix here once:

http://www.vcdhelp.com/phpBB/viewtopic.php?topic=49346&forum=3

It's lengthy, but you'll lose the annoying jerky movement. Somehow there are some DivX's that won't convert this way. Fortunately most will.

[drewid]

hey buddy.. thanks heaps thats the best answer i seen
now where in the convert section did you find it??

<font size=-1>[ This Message was edited by: drewid on 2001-08-14 01:19:51 ]</font>

[drone43]

Hi all,

I've been having exactly the same problems. I've found a much easier solution though.

1. extract the audio from the DivX using Virtualdub. Load the Divx, save the wav-file. Don't do any conversions in the process.

2. Load the resulting wav-file in Cool-edit or whatever audio-soft you're using, and convert the file to 44.1 KHz (if you skip this step, TMPG will convert the audio for you, which indeed is a lot faster, but it will give annoying anomalities in the sound). Save the wav without compression to an ordinary -uncompressed PCM- wav-file.

3. In TMPG, load the DivX-avi as video source. Load the wav-file you just made in the audio-source. Load NTSC-movie-VCD in the settings. And go.

4. Burn the resulting MPEG with Nero (best to select NTSC in the settings - this is not manadatory though)

And that's it. You will have a perfect NTSC-VCD (or SVCD). Don't worry about it being NTSC or PAL. All new TV's are multi-standard, so they'll play an NTSC-VCD as well as a PAL-one. No frame-skipping, no jerky movements, no audio-desync. (Oh and BTW: if you're going to play the VCD on your PC, you needn't worry about it being PAL or NTSC. Computers don't care about that. It's just older TV's that cause problems.

Peter

[HotSpot]

Drone: I agree with u.
All my divx with 23.976fps i convert it to NTSC. I live in a PAL zone, but my DVD and TV are compatible with NTSC, so no problem. It's thw easy way.

[drewid]

willem,

I have tried your method and i can say that the async is better but it is still out in some places and it comes back in others.. have you ever had this problem?

[willem]

The succes rate differs. Most DivX's can be converted properly this way. Some won't. I've never seen that when it was out of sync somewhere that it came back in sync later.

Since the 25fps video stream is as long as the audio stream after compressing it using CoolEdit you would expect that it would remain in sync after TMPGEnc put them together. Maybe <wild guess> something goes wrong when TMPGEnc converts the 48000 Hz .wav file to 44100 Hz mpeg2 audio </wild guess>. I'll try let tooLame do this conversion and then have TMPGEnc do the video conversion and putting it all together. Maybe this works.

When I find a solution I'll post it in this forum. If you find something please let me know or post it here.

[Blacklotus]

i've had the most success when matching framerate of the output file to the source. I live in ntsc land but my dvd player loves (hugs) [heheh] PAL encoded stuff so when i get my hands on a 25 fps source i encode to pal without issue. perhaps u in PAL land may try matching your source (ntsc) and see if it works

[Patjen]

I personally use virtual dub to recode to 25fps (video filter+direct stream +NO SOUND under audio) and then "save WAV file" but rename it later as *.MP3...

Then use winamp or whatever to reconvert the mp3 to WAV.
I do this because lotsa DIVX use VBR MP3 and cooledit often chokes on them...giving asynchs later after multiplexing.

When you have the 25fps avi and the wav file, check the length of this avi with virtual dub and use CoolEdit to stretch the wav to this exact length (in seconds), use fastest setting(do not forget to use a DOT as decimal character hehe instead of a comma in Cooledit--yup been there done that). Save stretched wav as windows PCM wav file.
Now you convert the 25fps avi with Tmpeg (no audio source)
Then also use Tmpeg to convert the stretched WAV to mp2 (no video source)...
Mux them together and 99.9% of all times it is a perfect match. Should it not be synch, check the coversion in VDUB to 25fps. I've noticed VDUB sometimes Loves up ( verify by checking the original avi and the 25fps avi durations with vdub)