Does Pioneer PX-7 also connect to a DVD player?

By Yellow-qing-geng-cai

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01-09-2021, 06:40

I will write to this forum for the first time.
Pioneer's PX-7 has two types of system control terminals (Din8 & mini plug), but when I looked closely at Pioneer products, I noticed that the mini plug terminals are installed from LD players to DVD players.
In materials such as manuals, it says "for connecting an amplifier", but is it possible to connect a DVD player and PX-7 to run DVD software?
(I am writing using Google Translate.)

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By sdsnatcher73

Prophet (2237)

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01-09-2021, 08:31

I don’t think anyone has tried this. Most likely Pioneer kept the control interface identical so in theory it should be possible. You won’t know if you don’t try Wink If you do try, please let us know.

BTW what DVD players sid you find that have the interface (if I can find one cheap I might try myself)

By Yellow-qing-geng-cai

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01-09-2021, 11:51

Thank You.
I have checked the international version (for the US) of DVD players now, but at least the DV-440, DV-414, and DV-344 seem to have a "Control IN" mini plug terminal. In addition, DV-563A has "Control IN" and "Control OUT".

By sdsnatcher73

Prophet (2237)

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01-09-2021, 16:50

One thing to do is convert the ogv files into DVD format whilst adding chapter markers. The frame numbers for the chapters are visible if you run the ogv through ffprobe. Not sure if ffmpeg can convert ogv to mpeg2.

By sdsnatcher73

Prophet (2237)

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01-09-2021, 17:34

Control IN should be sufficient BTW. I don't know if the format (NTSC/PAL) should match your MSX (probably a good idea though).

By sdsnatcher73

Prophet (2237)

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01-09-2021, 18:04

I found a nice document good document explaining conversion from ogv to DVD I tried it and basically it works. Now I have to figure out how to add the chapter markers (and get myself a Japanese Pioneer DVD player to set up next to my PX-V60).

By sdsnatcher73

Prophet (2237)

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01-09-2021, 19:52

Okay so here is what I did for Astron Belt LD->OGV->DVD conversion:

ffmpeg -i astron_belt.ogv -aspect 4:3 -target ntsc-dvd astron_belt.mpg
export VIDEO_FORMAT=NTSC
dvdauthor -o astron_belt/ -x astron_belt.xml

To create the XML you use the chapter markers in the OGV:

ffprobe astron_belt.ogg outputs (chapter 8 actually has a wrong start frame number):

      LOCATION        : total_frames: 48728
                      : chapter: 0,1-14400
                      : chapter: 1,14401-17312
                      : chapter: 2,17313-18573
                      : chapter: 3,18574-19888
                      : chapter: 4,19889-21217
                      : chapter: 5,21218-22539
                      : chapter: 6,22540-24939
                      : chapter: 7,24940-27489
                      : chapter: 8,24490-30058
                      : chapter: 9,30059-33017
                      : chapter: 10,33018-35739
                      : chapter: 11,35740-37167
                      : chapter: 12,37168-38803
                      : chapter: 13,38804-40384
                      : chapter: 14,40385-41882
                      : chapter: 15,41833-48728

The frame rate of the OGV is 30000/1001 or 29.97fps. To calculate the start of chapter 1 you take the start frame of chapter 1, divide it by 29.97 and turn it into HH:MM:SS.mmm (mmm is milliseconds).

The result is astron_belt.xml.

You now have a astron_belt folder that can be written to DVD (and hopefully played on a Pioneer MSX :))

By Pentarou

Champion (394)

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01-09-2021, 20:45

The Control In/out jacks in Pioneer devices are meant to share the IR signals, so you can have one device acting as the receiver while the other devices can be tucked away or in another room.
You just point your remote(s) to one device and you can control all the devices of the chain, obviously you still need EACH separate remote, although some remotes could control different device types.

This means that the devices can also be software controlled IF you build a PC interface and write the software to do it. Basically you need a software controlled IR remote emulator.
This was used in the early 90's by the German software house Software Corner, who sold a kit to play the original Dragon's Lair LD using a common (home) LD player with an Amiga controlling it via proprietary parallel cable.
Similar software was also ported to PC DOS machines.
Nowadays you can skip the LD/DVD altogether and use a Raspberry Pi as a player
https://www.msx.org/forum/msx-talk/software/software-msx-driven-laserdisc-player?page=0

By Yellow-qing-geng-cai

Supporter (3)

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02-09-2021, 06:27

The DVD version of Astron Belt was helpful. Unfortunately, I don't own any LD games, but if I feel like it, I can make it into a DVD, so I think it is necessary when leaving LD games that are at risk of corrosion to posterity.
There is also a method of using a raspberry Pi instead of a DVD player. It was written that unlike uncompressed laser discs, DVDs that take a long time to load because they are compressed may behave unexpectedly, and I was surprised that this happened.
I still think that the operation of the laser disc is only one-sided transmission of the remote control signal, but I am very curious about how MSX acquires the frame number and chapter number with "CALL FRAME" and "CALL CHAPTER" of P-BASIC. Will be. This is because if it is bidirectional communication, it may not be possible to perform operations around it with a mini plug connection.
If that can be resolved, I wonder if I can create my own software exclusively for Palcom.

By sdsnatcher73

Prophet (2237)

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02-09-2021, 07:39

I did not know about the PiLD (great name) and it seems LD had some advantages over DVD in direct seek. I would love to try out PiLD but it has not been released. Guess we have to get in touch with Louthrax.