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Avidemux - easy method to slow 25fps footage back to 24, and vice versa |
Posted by: SpaceBlackKnight - 2018-09-07, 05:48 AM - Forum: Converting, encoding, authoring
- Replies (11)
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Found a easy way to speed down PAL/25fps footage (that is correctly sped up from a film source and definitely NOT field blended video, as that would still require some convoluted secret sauce of multiple scripts) without the use for Avisynth (as still cannot figure that out for the life of me )
Now the catches to this are:
This program renders with lossy codecs, but you can set the quality as high as you want in each codec's settings and get near transparent quality.
If your file has an audio track you want sped up to sync with the video, you can only get the "Film to PAL" box if you render with AAC or AC3 in the "Audio Filters" tab (copy stream with PCM, DTS, or DD Tru HD or Plus will not work and sound garbled). In this case, it is highly recommended to extract your multichannel/lossless audio and bring it into audacity/whatever other audio program you use and change speed/tempo to -4.096 (or the same number but without the - for speeding up 24fps to 25) to render separately and sync to the re timed video manually.
Download the latest version of Avidemux (freeware) http://avidemux.sourceforge.net/download.html
Load up your video, then in the video output column on the left. In order to access filters for what we're going to do, it requires a re-render. Click "Copy" and scroll down to the video codec you want to render in and hit "Configure" to set it's perimeters/bitrate to whatever you like.
Next, go to "Filters" underneath the configure tab and the video filter manager window pops up and should put you at the "Transform" selection of filters. Scroll down to the "Change FPS" filter, top source FPS should be set at "Custom" and the lower would denote the actual frame rate of the source. Since our source is "25fps", leave the top two as is and tick "Destination FPS" and select "23.98". Note: if your 25fps source has some odd interlace or top field/bottom issues, I would try the "Deinterlace" filters after you have the Change FPS filter on and find one that works best (if you do it before, you're gonna have field blended shit). Otherwise, I would deinterlace your 25/50i video in a different program that you're familiar with first. Now, if you want to speed up a 24fps source to 25fps, put 25 in the Destination FPS box and don't do anything else unless you need to have audio in sync which will require a lossy rendering in the next step.
Then press OK and it should show up in the "Active Filters" window and close the filter manager. Next, we're gonna have to render audio too if you do choose to keep the original track in sync. Hit "Copy" and choose the audio codec of your choice and whatever rate you like under "Configure". Next, go to "Filters" and in the audio filters window "Frame Rate" change is set to none. Click the drop down and select "PAL to Film" (or "Film to PAL" if converting 24fps to 25). Now, your files audio sample rate should be ether 48000hz or 44100 if the audio was from a CD or LD. If it's the latter, the you'd have to re-sample it in the tick box to 48000hz or the synced audio will have this weird garbled ghost effect. Note: you can hit the "Shift" check box to shift your track several ms to however you want and can set gain to your choosing. I would not recommend using the mixer tick box, as that's for folding down "untouched" multi channel audio and may cause problems with your sped down or up.
Now in the output format, choose the container you want to render in. I highly recommend "MKV" or "AVI", as all the others may not handle the audio correctly depending on the audio codec used. Click the save floppy icon to select your destination and render away. When your file finishes, you should notice a run time difference in your video compared to the original, in addition to a slight motion change (should be no blended fields) and a pitch change in audio.
I understand this method may not be ideal for those who use Avisynth and such, but this is a easier way to speed up or down footage without any blending/frame judder for those who aren't up to the steep learning curve of AS.
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Return |
Posted by: SpaceBlackKnight - 2018-09-06, 06:16 AM - Forum: Presentation
- Replies (2)
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Sorry' it's been a while. While have been somewhat active over at BD.com, I've made my return to Fanres... Until something else major comes up.
Had so much shit hitting the fan back in Jan ranging from not being able to work for a few months due to water damage from bursting pipes at where I work, discovering personal health issues, tending to family members, my old PC's mobo and HD going and losing bits from a project I was working on, a POS at a plastic model club meet who scammed me out of nearly $1000 (won't go into the rest), I was literally at my mental limit with all this.
Now I have some of these things under control, and I have joined Blu-ray.com to provide insight and such since I have a little bit more time and sanity. However, while my new PC (Referb Lenovo ThinkCentre M82 Win 7, I5-3470 3.6ghz, 2Tb hard drive, 16gbs of ram but integrated Intel graphics for only $250) is much more powerful than the crap Celeron Acer Aspire desktop I previously had, the ThinkCentre isn't that strong for intensive editing, and I'm on a rather tight budget so I can't really afford to upgrade much and do big projects and all. On the other hand, I can assist with editing short bits and logo stuff if one needs such assistance
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LD in depth collection videos |
Posted by: captainsolo - 2018-09-06, 02:32 AM - Forum: Movies, TV shows and other
- Replies (37)
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I finally started making videos of my LD collection because I got tired of the general lack of info on the format for most online videos and the fact that no one discusses transfers etc.
So if you’re interested or simply bored and have some spare time I’ve been doing uploads where I go through each title one at a time and discuss the transfer, sound, packaging and a little history.
https://www.youtube.com/user/duckyousuckr
I’m still not finished and I’m almost to part 15! Admittedly these videos are very low fi but I was tired of “LDs suck or were stupid” videos or mere pickup ones without detail.
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Carver prologic decoder and other sound processors |
Posted by: captainsolo - 2018-09-06, 02:23 AM - Forum: General technical discussions
- Replies (2)
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I found a Carver DPL-33 dolby prologic processor in a local listing and was curious how it might compare to the mighty Shure hts line. It seems like a similar unit down to the channel lights on the front and was a high end expensive model at the time in 1993.
It’s very cheap but my receiver lacks analog ins.
Has anyone used one of these for Dolby stereo/surround decoding?
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Sync problems during analog capture? |
Posted by: BusterD - 2018-09-01, 05:52 PM - Forum: Capture and rip
- Replies (13)
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Anyone ever had problems with sync drift when separately capturing analog audio and video?
Lately I've been backing up some VHS tapes using my Sony Blu-ray recorder. It records in h264 instead of MPEG-2, which is great for someone like me who has little experience with video encoding. But it only records audio in 256kbps AC3, so I've been using my M-audio 2496 sound card to record the audio to PCM at the same time. Only thing is, when I try to sync up the video from the recorder with the audio from the PC, even after I sync the start times, the PC recorded audio drifts forward out of sync at about a rate of 40 milliseconds every 10 minutes, which becomes pretty noticable after a while. Now that I think about it, Jonno had similar problems with a capture of an analog-only LD that I made for him a couple years ago using the same equipment.
Not sure why the sync drift occurs, or how I could prevent it... I also investigated an LD I recently recorded with digital audio, and there's also a slight sync drift, but it's only about 30ms for every hour of video.
Guess I'll just have to cut bits of silence here and there whenever I want to make a backup with lossless audio. I probably won't notice the difference, so I guess I'll only bother with titles I really care about.
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