25p to 24p

[daWsOn_s]

Hello,
I have a PAL DVD-Video Disc (that is not mine), considering I hate 4% speed-up I would like to compress it in h.264/aac recreating the 24p speed and audio tone. I use Megui, is there any chance that I can do that? If so, will I get a true 24p or it's a "slowing matter"?

[Atak_Snajpera]

My app will do this quite easy. Select AssumeFPS -> 23.976 and under A/V Same Lenght select Stretch

[daWsOn_s]

Hi :)

2 problems:
- the audio stretching maintains the 25p audio tone, I don't want it to do that, I want it to change according to speed = original 24p tone
- as I said in the other topic, when it finishes the encoding the status remains "muxing" and it won't start the other job in the list even if it's actually ready.

[Sharktooth]

if you play a bit with avisynt scripting you can do what you want. in megui you can save an avisynth preset to re-use it whenever you want.

[staul62]

Hi daWsOn_s,

I share your feelings about the 4% speedup!

Not knowing MeGui very well, the following may or may not be of help to you. I use it to trick PAL DVDs to play as NTSC DVDs on a PC only. I leave the video alone and slow down the audio. Then I patch the frame rate to 23.976 and remux.

I am not sure whether PARs will be affected by this approach and I am very doubtful that my fudge would play on a standalone player but it works for my purpose and may work as part of your process chain.

http://forum.doom9.org/showthread.php?p=1072758#post1072758

Hope this helps. Errors in my logic politely pointed out are always welcome!

[daWsOn_s]

hi staul62 :)

I tried your instructions , the video is ok but I can't get the audio speed/tone down with BeSweet. I tried chancing framerate, pitch and tempo but I always get the same speed.

Though I'd like to do the audio encoding directly with megui, that's because I sometimes use avs cutter and I don't like to do double encoding. if Megui had the option to slow down the audio according to video duration without maintaining the pitch this would be done!

[daWsOn_s]

if you play a bit with avisynt scripting you can do what you want. in megui you can save an avisynth preset to re-use it whenever you want.


How can i use avysynth for audio in megui?

[poisondeathray]

How can i use avysynth for audio in megui?

MeGUI's audio component is based on BeHappy and it accepts .avs scripts

e.g. NicAC3Source(), WavSource(), DirectShowSource()...etc..

[tebasuna51]

You can use Megui to transcode to aac an .avs like:

NicAc3Source("x:\y\z DELAY 123ms.ac3")
DelayAudio(0.123)
TimeStretch(pitch=96.0/1.001) #100 x (24000/1001) / 25

[daWsOn_s]

YES it works! Thanks everyone :)

[staul62]

hi staul62 :)

I tried your instructions , the video is ok but I can't get the audio speed/tone down with BeSweet. I tried chancing framerate, pitch and tempo but I always get the same speed.


Hi,

I agree - I couldn't use BeSweet either. I had to use BeLight. However, it sounds like you have a solution which I may even try myself.

[daWsOn_s]

I meant BeLight.

I did this:

- copy VOB files
- 25 to 23,976 with DVDpatcher
- create avisynth with BeHappy changing time to 23,976 without keeping the tone
- encode and mux video and video with any Gui that supports avisynth :)

[staul62]

Sounds good to me! I'll add it to my toolbox.

[daWsOn_s]

I have a 448kbit ac3 5.1 track.
Is there anyway to mux this track and slow it down but WITHOUT re-enconding ?

[Honeyko]

AutoMKV also has an "assume FPS" setting in Advanced Settings. (Don't forget to also alter the audio.)

To change an already ripped XviD AVI, do the following:

1. Demux audio with VirtualDubMod's "Streams" list. (Leave vdub upen.)
2. Open file as audio in AutoMKV and change FPS from 25 to 23.976. UNCLICK normalize if volume is adequate.
3. Back in vdub, gray out old audio and add in the new audio.
4. Under Video, change frame-rate to 23.976.
5. Fast stream-copy save.
6. (optional) correct aspect-ratio using MPEG4modifier.
7. (optional) open and resave the AVI in AVImuxGUI (shaves 1-5mb off filesize).

The same trick works in reverse for improperly timed NTSC releases of European films (such as "Diva", in which an opera tenor croaks like a baritone bullfrog after she's slowed from 25fps to 23.976).