25fps to 24fps software that fixes pitch shift

[Falcon]

I agree what I do is I recode to DTS half bitrate when working from a lossy track. DD+ 640kbps also can do the trick.

Thanks
I'm going to change DTS half-bitrate of DVD, to full DTS after slow-down + sync to be safe
But I think a DD track must remain in DD because the DTS probably has a compression method/filters too different.

I had read that the Dolby Digital plus decoder in HD-DVD players can convert the DD+ tracks in DD with the best quality possible by analyzing the common filters between the 2 formats, and do not redo this compression.
This method offers better quality than commun transcoding software.


Are there any software that also use this feature?
(without intermediate conversion to PCM)

[Stamper]

Yes I was wondering. All my Terminator mono mixes I exported to DTS, but I can always redo them in Audacity in DD+ if PDB think it saves space. As most rips are originaly DD.

[Falcon]

Unfortunately, the DD+ is not compatible with blu-ray I think, the DD + is only used for additional rear channels.
I did not find any evidence on the net that the DD+ "full" as on the HD-DVD (and not an extension of a DD track) is BR compatible.
Your solution is good for MKV, but maybe not for use on homemade BR

[Stamper]

DD+ is just DD 640 kpbs right? I thought old releases like Mad Max 2 early Blu-ray had DD+.

[Chewtobacca]

Unfortunately, the DD+ is not compatible with blu-ray I think,

It's compatible.  It's just that player support for it is optional.

DD+ is just DD 640 kpbs right?

No. It's a different codec.  It's just that 640kbps is a common bitrate for 5.1 for both AC-3 and E-AC-3.

[Falcon]

DD+ is just DD 640 kpbs right? I thought old releases like Mad Max 2 early Blu-ray had DD+.

I think it's an error for Mad Max 2. 
The cover indicate Dolby Digital + but caps-a-holic.com, and all review, indicate DD normal. 

There was a lot of error of this kind on the movies that appeared at the same time in HD-DVD + Blu-ray, Blu-ray indicate the same spec of the HD-DVD cover, but it's false.

Blood Diamond too, the Blu-ray cover shows DD + but it's DD (DD+ only on the HD-DVD version).

It's compatible.  It's just that player support for it is optional.

I had read a thread where a person was testing a DD+ track (without core DD) on a homemade BluRay disc. On some players, it could crash (but maybe it was due to an authoring problem?).



I maintain that the DD + (full, without core) is good for MKV (EAC3 is one of the best lossy format) but not for the BR / AVCHD for its lack of compatibility.

If the original track is DD + (from an HD-DVD or a Web-DL), leave it as it is, but if you convert a DD track, leave it DD, so you do not have a problem compatibility

[Falcon]

Using Audacity for correcting PAL sped up audio back to 23.97/24 fps rate is easy peasy lemon squeezy, its converting 25fps video (non ghosted, don't start me on field blended shit as I haven't figured that out yet) back to 23.97/24 that's much harder for a novice like me, until I found a secret sauce I came up with.

If the video is at 1080i 50hz (usually sped up and not a field blended shit fest), 1st thing to do would be to use an external converter program to convert it's audio to WAV then use the speed and pitch tab to decrease the rate by -4,096, which brings it back to 24fps then export. For the video content, I deinterlace (BOB) and detelecine using Vidcoder at 25fps to get clean, progressive frames, then take that file into Tsmuxer, tick the change frame rate box and select 24000/1001, then drop in the WAV file you corrected in Audacity and mux. This is what I did to correct the 25fps transfer for Umbrella's Razorback BD back to 24fps and it's perfect with no dropped frames plus the sound runs proper and in sync (despite being in wave 5.1 PCM instead of DTS-MA which has no free conversion alternative).

I think Blu Ray 1080i (50hz) are encoded in progressive, with a flag indication for the .M2TS to convert the AVI files progressive (25fps) to Interlaced 50fps, like for lot of DVD.
I've never see interlacing in a 50i Blu Ray movie, only on bonus (because bonus are captured and encoded on interlaced probably).


I have a question for the final export after slow down a pal audio track: Can I up the bitrate for keep the quality ? 
 if I have a track encoded on 192-224 (mono or stéréo) or /384/448 (5.1) kbps, after slow down, the musique are more grave, and I get a music a little différent, If I up the bitrate, maybe the encoder apply less filter for compressed the audio (and all encoder don't make the stricly same algorythm).

I think convert DD 384/448 to 640 after slow down, or DD 192-224 in DD 320

[deleted user]

When you re-encode in a lossy codec, you always lose quality, even at high bitrates. Higher bitrates minimize the loss. If you don't want any loss at all, save the retimed one as FLAC or PCM. But most people here will probably just reencode at the original bitrate typically, at least for the supplemental audio tracks.

[SpaceBlackKnight]

I think Blu Ray 1080i (50hz) are encoded in progressive, with a flag indication for the .M2TS to convert the AVI files progressive (25fps) to Interlaced 50fps, like for lot of DVD.
I've never see interlacing in a 50i Blu Ray movie, only on bonus (because bonus are captured and encoded on interlaced probably).

I have a question for the final export after slow down a pal audio track: Can I up the bit-rate for keep the quality ? 
if I have a track encoded on 192-224 (mono or stereo) or /384/448 (5.1) kbps, after slow down, the music are more grave, and I get a music a little different, If I up the bit-rate, maybe the encoder apply less filter for compressed the audio (and all encoder don't make the strictly same algorithm).

I think convert DD 384/448 to 640 after slow down, or DD 192-224 in DD 320

1080i 50hz comes in two flavors, the progressive-to interlaced flagging method you mentioned, and a 50fps hard interlaced stream. The first type is common on film based 25fps BD transfers and like you said, appears progressive and displays without any combing, but flags as interlaced for 50i displays. However, this type has both upper and lower scanline fields present (despite many software detecting it as lower field first, probably just throwing out half the information) and without proper deinterlacing before slowing it back down to 24fps, can result in jaggies or bobbing line twitter when converting it to progressive. TSmuxer can slow down 1080i 25fps film content back to 23.976, but the 24fps converted file still has it's PAL interlacing flags and can cause the above issues when converting it to progressive improperly or playing it back on some software and BD players.

The 50hz hard interlaced encoding type are more often found on material shot shot at 50fps like TV shows or certain bumpers/trailers and definitely show combing. However, I've seen this on sped up 25fps film material that also shows prominent combing, and will require a detelecine+deinterlacing method before converting back to 24fps.

What do you mean by the music sounding "more grave" after slowdown? Unless you're encoding in a basic profile at a low bitrate under 96kbs, there won't be much of a difference in pitch. It's very common for things like music and audio to sound different during slowdown, unless your source happened to be sped up to 25fps but kept it's 24fps pitch. Are you doing both pitch and tempo correction or just one of them during conversion? I've seen instances where a 24fps source will have it's audio converted from a 25fps master but erroneously retaining it's higher pitch and sounding all "distorted and scratchy" and vice versa with some 25fps material.

[Chris Knight]

Hi,

Interesting topic, but i wonder something...
I have some dvd pal, that i'd like to watch, but the pal speed up is really bothering me..
Here on this topic,we're talking about converting those videos, but i'd like to know if it is possible with a software (maybe madvr or others), to just watch directly the dvd, at the right speed, without ripping it and converting it..

I'd like to avoid converting entire seasons of tv shows that i still have on dvd, and just watch them at the right speed..
is it possible?