Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[mattkhan]

https://github.com/3ll3d00d/mwcapture

latest release can be found here -> https://github.com/3ll3d00d/mwcapture/releases

this is a directshow filter that enables use of a magewell pro card (https://www.magewell.com/products/pro-capture-hdmi-4k-plus) in MC (and other directshow apps)

you can use such cards in MC without this filter so the differentiation comes from

* will automatically try to handle signal changes, mainly this means from SDR to HDR and back (NB: actual support depends on the renderer, JRVR does support this so all good for MC)
* can handle multichannel audio

limitations noted on the linked github inc

* only tested on my system
* multichannel audio channel layout is a ? atm (I need to test more)
* I think changing audio format is technically supported by my filter but MC (as far as I know) does not this on the fly so it's probably a moot point

code is publicly available as is the build recipe, if feeling paranoid then feel free to build it yourself

note that this is a 1st release, it does seem functional (ignore the multichannel audio bit) to me but I think anyone using it should go in expecting problems & be prepared to provide logs to explain what they see (using one of the non release builds)

[Lep334]

So does this work like videoprocessor works for Madvr?

[mattkhan]

So does this work like videoprocessor works for Madvr?

Yes you could use it that way (though this is driven by the metadata in the stream rather than user choice)

[mattkhan]

NB: the key difference being you're not pinned to a renderer with an unknown future (madvr)

[mattkhan]

Now that video seems done, continuing to work on multichannel pcm, and audio format negotiation. I eventually realised that the channel mapping in cea-861 is different to usual output formats so I need to add some logic to handle whatever is in the audio hdmi infoframe.

[Lep334]

NB: the key difference being you're not pinned to a renderer with an unknown future (madvr)

That is definitely exciting.  Will keep an eye on this for sure

[mattkhan]

It basically works now as far as I can see so you just need a card to test it out

[mattkhan]

for audio, I found https://learn.microsoft.com/en-us/windows/win32/coreaudio/representing-formats-for-iec-61937-transmissions which looks like it corresponds to the info in 6.6.1 of https://ia903006.us.archive.org/11/items/CEA-861-E/CEA-861-E.pdf (HDMI audioframe) so I guess I should be able to try to send such encoded content from my filter in the right format, whether it works or not is probably something that's going to take a bit of time to test out

[mattkhan]

Looks like https://ffmpeg.org/doxygen/trunk/spdifdec_8c_source.html#l00189 is what is needed to determine the contents of the bitstream

[mattkhan]

Managed to successfully receive ac3, now to work out how to push that through mc

[mattkhan]

as far as I can tell, https://github.com/3ll3d00d/mwcapture/releases/tag/0.3.0-beta.5 works from a software point of view and is compatible with LAV & can handle multi channel PCM as well as a bitstream correctly and switch between HDR and SDR (as much as I've been able to test).

For video, this seems fairly straightforward and seems to work ok.
For audio, PCM seems fine, AC3 seems fine, anything beyond AC3 (EAC3, truehd, dtshd) seems much much more brittle and whether it works or not seems entirely source dependent. i.e. I've tested a few different source devices, each one has behaved differently and, as far as I can tell, these are not software problems at my end.

[eve]

This is chill. Also a nice confirmation that those Magewell cards do handle multichannel properly

Thanks.

Say you were to be splitting out your video *before* the magewell using it only for audio, any clue about the latency coming out of the directshow filter? If I was utilizing the direct show filter in GStreamer or something.

https://www.magewell.com/developer/14/detail is interesting. Will need to investigate this more.

[mattkhan]

there's some more detail in https://www.magewell.com/developer/26/detail inc some measurements they provide, I am using the low latency with partial notification mode (min 64 lines chunks) because why not

might be stating the obvious but.... the actual latency will be heavily dependent on the host hardware, what you capture & what you do with it so not sure measurements from elsewhere will be terribly useful and I'd guess the latency is commonly going to be dominated by what you do with the frame.

In this case, the entire frame has to be received before it can pass downstream and latency is going to be dictated by what the renderer does with it (and timestamps on the audio stream).

I'm not a directshow expert but I don't see how that (frame/sample based) api could fully benefit from partial notification, i.e. you'd need to be able to feed the lines into some buffer that a renderer can operate as and when it arrives in order to reduce latency further but since that's going to be done on the gpu then I imagine you want to be writing fewer times in smaller chunks (assuming a usual windows setup with a discrete gpu that has its own ram which is relatively costly to write to)

[mattkhan]

fwiw https://github.com/3ll3d00d/mwcapture/releases/tag/0.3.1 seems to be fully functional to me, supports switching between HDR and SDR and between different codecs (PCM to AC3 to EAC3 etc)....

... however the card, in my setup at least, cannot handle 192kHz audio without loss which prohibits use with anything beyond AC3 (or non HD DTS but I don't think that is used basically anywhere these days) for encoded audio

also depends on https://yabb.jriver.com/interact/index.php/topic,140304.0.html to be used with MC

[mattkhan]

https://github.com/3ll3d00d/mwcapture/releases/tag/0.4.5 fixes some remaining glitches in PCM audio handling, seems stable to me at least

video has been fine/untouched for ages so still switches between hdr and sdr automatically without issues

I added support for magewell usb devices as well so they should work ok (my own testing is a bit lighter but seems ok)

[robin49]

Bonsoir Matthieu Khan.

j' ai installé une carte Magewell LT Plus depuis 3 ans maintenant.
je lis vos travaux ...super.
j'ai essayé d'installer votre programme , mais je bute sur : Exécuter regsvr32 mwcapture.ax... je ne vois que mwcapture.ax dans le répertoire
j'ai installé le dernier SDK Magewell...
Merci de m'indiquer des précisions.
Par avance merci
Fabrice

[mattkhan]

Bonsoir! I don't speak French so will write in English and let you translate as best you can

Did it register successfully?
Are you using 0.4.5 (the latest)?

[robin49]

Bonsoir à vous.

je ne suis pas bon en informatique, à l'installation des erreurs de dll voir pièces jointes.
même sur le Magewell SDK, je ne comprend pas.
exécuter regsvr32 mwcapture .ax
je ne vois pas de regsvr32 exécutable.
j'ai mis le pc à jours.

à plus Matthieu.

[mattkhan]

did you mean to attach something?

ok so you need to

1) run a command prompt as adminstrator
2) cd to the directory containing the ax file
3) enter the command and press enter

regsvr32 mwcapture.ax

you should get a dialog message saying it was registered

now you should be able to see the capture device in MC

[robin49]

Bonjour à toi.

à l'installation de Magewell SDK j'ai une erreur ...
Unable to register the DLL/OCX : RegSvr32 Failed with ext code 0x3
Là je tourne en rond....

Par avance merci.

Fabrice

[mattkhan]

you mean https://www.magewell.com/sdk doesn't install successfully?

[robin49]

you mean https://www.magewell.com/sdk doesn't install successfully?

Bonjour Matthieu.

Oui c'est çà, impossible de faire une installation complète, pourtant le pc est à jour.
Une idée.

[mattkhan]

and what version of windows are you using?

[mattkhan]

I can't say why you can't install the sdk

ultimately you need https://aka.ms/vs/17/release/vc_redist.x64.exe + mwcapture.ax + one dll from their sdk (which I could send you separately) but if you can't even install an exe then not sure how well doing it manually will work

[robin49]

Bonjour Matthieu.

Windows 10 Pro.
je peux formater le disque dur.
ce PC me sers uniquement au vidéoprocessing avec lecteur Blu-ray magnétar 800 et Shield tv pro.
je vais installer alors le tiens.

à plus tard.

[robin49]

Bonjour à vous.


C'est fou ,j'ai formater le disque dur et installé Windows 10 pro, impossible d'installer le Magewell SDK, toujours la même erreur....
c'est dingo.
Dommage.

Fabrice

[mattkhan]

Frustrating!

I will look at packaging in a way that doesn't need the SDK and is self-contained zip file. Pls give me a few days to do it.

[mattkhan]

just to check, have you tried running MWCaptureRT.exe that's in my zip file?

[robin49]

Bonjour Matthieu.

Merci pour le pack.
j'ai pu installer le SDK sur un pc portable avec un os Windows 11. d'ailleurs votre système os, c'est quoi Mac, Linux...? Mais je veux bien votre Pack pour mon Pc de Vidéoprocessing.
hier soir, j'ai pu observer que pour être en full RGB, sur toute la chaine , Projecteur, lecteur Blu-ray, pc nvidia, Madvr, Magewell dans propriétés, et enfin soft avec par exemple MPC-HC
sur affichage vers capture le régler sur RGB 32...
sinon j'étais obligé de régler Magewell dans propriétés à 16/235, si le réglage de la capture dans le soft de MPC-HC est réglé sur YUV2.
par rapport à avant, l'image à plus de dynamique, et sur un 4k malgré l'absence des métadonnées HDR , les noirs sont moins bouchés...
D'ailleurs Machi de madvr conseille de régler le projecteur en 16/235 avec un envy ... en dehors du full RGB en format d'acquisition c'est logique, on est en 16/235...

A vous lire Matthieu.

Bien à vous.

Fabrice

[robin49]

Re Bonjour Matthieu.

je vais le faire, lancer votre exécutable RT Magewell.
et si je formaté le disque dur et installer Windows 11 Pro....

[robin49]

Alors, je viens juste de vérifier, et c'est les mêmes codes erreurs.
je vais voir à le passer en Windows 11.

à plus tard.

Fabrice

[robin49]

je suis passé à Windows 11 pro pour voir...
toujours la même erreur...

[mattkhan]

j'ai pu installer le SDK sur un pc portable avec un os Windows 11. d'ailleurs votre système os, c'est quoi Mac, Linux...? Mais je veux bien votre Pack pour mon Pc de Vidéoprocessing.
hier soir, j'ai pu observer que pour être en full RGB, sur toute la chaine , Projecteur, lecteur Blu-ray, pc nvidia, Madvr, Magewell dans propriétés, et enfin soft avec par exemple MPC-HC
sur affichage vers capture le régler sur RGB 32...
sinon j'étais obligé de régler Magewell dans propriétés à 16/235, si le réglage de la capture dans le soft de MPC-HC est réglé sur YUV2.
par rapport à avant, l'image à plus de dynamique, et sur un 4k malgré l'absence des métadonnées HDR , les noirs sont moins bouchés...
D'ailleurs Machi de madvr conseille de régler le projecteur en 16/235 avec un envy ... en dehors du full RGB en format d'acquisition c'est logique, on est en 16/235...

I have tested on both Win10 and Win11 feeding hdmi from a STB or another PC which means I've tested with both RGB (really BGR) and other formats (my STB seems to generally produce 10bit 422 output). The software will adapt the capture format to match what's coming in on the stream if possible.

je suis passé à Windows 11 pro pour voir...
toujours la même erreur...

can you post a picture of this error pls

MWCaptureRT.exe is the redistributable runtime that Magewell provide so if you run that then you should find it produces C:\Program Files\MWCaptureRT 3.3.1.1513 which just contains the uninstaller as it's put LibMWCapture.dll into C:\Windows\System32

you may need to manually bypass the smartscreen warning that windows produces to let it install

if you don't want to trust that then it's also part of the SDK as described in https://www.magewell.com/developer/20/detail (installing the SDK gives you both debug and release dlls)

[robin49]

Bonsoir Matthieu.

j' ai essayé à plusieurs reprises de t'envoyer des captures d'écran, mais le forum me l'interdit pour l'instant, il faut que je demande à l'administrateur de l'autoriser...
je ne sais pourquoi.
j'ai aussi la même erreur en passant par MWCaptureRT.exe...

à plus.

Fabrice

[robin49]

J'ai demandé à Magewell un ticket en soutien...
à partir du 06 février, nouvel an chinois...

[robin49]

Bonjour Matthieu.

Pouvez vous me contacter par mail.?
Par avance Merci.

Fabrice

[mattkhan]

It's better to post your problems in public, either here or on GitHub

[robin49]

Bonsoir à vous.

peut-on envoyer des capture d'écran...?
et comment fait-on...?

Par avance merci.

[robin49]

Bonjour Matthieu

je viens d'avoir le retour de Magewell concernant l'installation du SDK, " Cliquer sur ignorer " c'est tout.

Par contre à l'installation de votre application, j'ai un erreur... j'ai créé un dossier hdr, dans c: pour mettre votre dernier dossier mwcapture-0.4.5-debug-trace-logging.zip

sur cmd  c:\Windows\System32>cd c:\hdr
ensuite c:\hdr>regsvr32 mwcapture.ax
plantage ensuite   en titre RegSvr32   échec du chargement du module " mwcapture.ax "

je me trompe ou...?

Par avance merci.

[mattkhan]

Bonsoir à vous.

peut-on envoyer des capture d'écran...?
et comment fait-on...?

Par avance merci.

when you click reply, you should see an option below this text box "Attachments and other options", expand this and add files that way

Bonjour Matthieu

je viens d'avoir le retour de Magewell concernant l'installation du SDK, " Cliquer sur ignorer " c'est tout.

Par contre à l'installation de votre application, j'ai un erreur... j'ai créé un dossier hdr, dans c: pour mettre votre dernier dossier mwcapture-0.4.5-debug-trace-logging.zip

sur cmd  c:\Windows\System32>cd c:\hdr
ensuite c:\hdr>regsvr32 mwcapture.ax
plantage ensuite   en titre RegSvr32   échec du chargement du module " mwcapture.ax "

je me trompe ou...?

Par avance merci.

don't use a debug build, use a release build  i.e. mwcapture-0.4.5-release-trace-logging.zip

I recommend renaming the file to mwcapture-trace.ax before registering it

[robin49]

Bonjour Matthieu

Un grand Merci à vous, pour votre patience...
j'ai demandé à magewell pourquoi les métadonnées HDR ne passait pas en acquisition...

on verra leur retour.

j'essaie les indications et je reviens vers vous.
j'ai essayé jriver 33 en acquisition.. la carte est reconnu en appareil photo...faudrait plutôt la mettre en "Périphérique ", la qualité n'est pas bonne, un réglage mal fait
en effet l'image est en trés basse résolution, quel réglage à effectuer..?

Par avance merci
Fabrice

[mattkhan]

How MC presents it in the television options is out of my control,. similarly how MC renders it is outside of my control as these are options you set. Generally this filter takes what goes in and passes it down to whatever renderer you have configured, that's all.
If you have Q's about MC then probably best to start a thread on a MC board to ask those but minimally you need to show the jrvr debug and associated config otherwise no one will have any idea what you are referring to.

[robin49]

Bonsoir à vous Matthieu


l'installation est un succès, filtre indiqué Magewell pro capture trace    je vois sur madvr rgb 24, mais sur du 4k pas de hdr...

dans madvr tone using pixel shaders , les métadonnées hdr ne fonctionne pas, je veux dire quand on bouge les valeurs du dtn ou le display peak luminance, il se passe rien du tout.
la carte pour l'instant n'est pas transparente pour laisser passer les métadonnées en HDR.
faut-il désinstaller Madvr..et le réinstaller...?
fonctionne t-il avec une application spéciale...?
Merci encore pour votre travail acharné et votre patience...
je n'ai plus accès aux réglages de la carte Magewell .

Merci.

Fabrice


 

[mattkhan]

je n'ai plus accès aux réglages de la carte Magewell .

what settings? I don't recall there being any settings apart from editing the edid. There are no filter property pages showing info about the card if that's what you mean as that's provided by their filter & I haven't implemented anything like it.

I haven't tested at all with MC/madvr combination as I don't use it, part of the reason to write this was to be able to use jrvr so I can use a supported renderer that works reliably (for me, madvr is now quite unreliable and, since it's unsupported, seems time to move on). I have tested madvr in mpc-hc though and could see it happily playing and tonemapping BT2020 content. Either way, same point can be made, if you don't show detailed info on what you're playing, impossible to comment.

[mattkhan]

small fix in https://github.com/3ll3d00d/mwcapture/releases/tag/0.4.6 (you'd get no picture if the input signal had 12 bit colour depth)

[robin49]

Bonjour à vous Matthieu.

oui ,je passe en 10 bits.
quel version de MPC-HC utilisez-vous...?
et utilisez vous le tone map HDR using pixel shaders de madvr..?
çà veut dire transformer le hdr en sdr et de pouvoir l'appliquer sur un écran courant même en 1080 p.

je vais installer votre dernière version...

à plus tard et merci encore, c'est passionnant...

[mattkhan]

I have no idea what those settings are or what they affect, to repeat my filter takes the input and presents it to the downstream filter (typically the renderer) in the same format so there should not be any settings that affect this, only settings for the renderer and your display.

If you cannot or will not post detailed information (e.g. debug OSD, source, what output format it sends) then I cannot attempt to help you. I've said the same thing a few times, pls do it or I have to ignore.

[robin49]

Justement Matthieu, j'aimerais pouvoir vous joindre des capture d'écran mais cela ne fonctionne pas ,le site indique "erreur".
j'ai essayé de joindre l'administrateur mais la messagerie me dit quel est pleine.

j'essaie encore

[robin49]

  çà marche...

bon je vais vous joindre des captures d'écran...

à bientôt.

Fabrice

[mattkhan]

mw_venc is their library for hardware encoding, my filter doesn't use it and doesn't depend on it so i do not know what you are doing