Yaron

From what you're writing, it seems that I'm in more of a mess than I initially considered. Most of the strings I use are WideString in order to support Unicode text in Delphi 7, not only that, all of my base visual components are based on the TNT Unicode library (e.g. TTNTForm, TTNTListBox, TTNTStringList, etc), so I can't even load the project without getting lots of error messages and I'm not even sure if the TNT Unicode library is compatible with Delphi 10.3, which means I have to revert 1000's of work-arounds for unicode text that I've implemented over the years. My code also uses quite a bit of ASM optimized code for Audio DSP, graphic processing, etc.

Is there a way for me to continue developing/fixing the current Delphi 7 version while slowly fixing the code (maintaining Delphi 7 compatibility) based on compiler errors in the Delphi 10.3 environment without breaking everything? Or is my only option to maintain two separate code-bases until I successfully complete the transition?

Everyone replying about strings, my code deals with a lot of UTF8 encoded strings, wouldn't leaving "string" as is has the potential of breaking UTF8 encoding in places?

Thank you everyone for your kind advance. Zoom Player is already fully unicode, I bypassed this Delphi 7 limitations by using the TNT Unicode Controls, so at least part of the process wouldn't be as painful. Since whatever string that needed to support unicode is already defined as "WideString", I thought of doing a blind search and replace from "String" to "AnsiString".

I hope this is the right spot & apologize if it isn't. I am the developer of Zoom Player, a windows media playback software developed in Delphi and initially released early 2000. Since then, Zoom Player has grown to over 500,000 lines of code and code-base wise, Zoom Player is stuck at Delphi 7. Over the years I got around most of Delphi 7's shortcoming using custom code, but now I've reached a point where converting Zoom Player to 64bit is becoming a greater necessity. I own a license to Delphi 10.3 so that is the 64bit target code-base I'm aiming for. Do you have any advice for me on ways to automate the jump from Delphi 7 32bit to Delphi 10.3 64bit without breaking the code in 1000's of places? Is there an AI agent or some other tool that could help me in this context? Right now this feels like a pain-staking months long project, am I wrong?

ImageEn is overkill and I can't pay for it. I couldn't find the actual compiled DLL for the GitHub project, otherwise I'd do the headers myself. I simply can't compile the DLLs as I don't have the infrastructure for this. I am aware that there is a section in the readme file that points to a windows library, but it doesn't link to a DLL (the only file there is "avif_x64_Release.lib"), so I'm not sure how I can use that in Delphi. Nope, nothing came up (and I did search both Google and Github before posting here). Thank you, but that's a video component, which interestingly enough is not an issue as there are AV1 video decoders out there that can be used in Delphi through DirectShow.

It's a relatively new image format, part of the AV1 specification. I haven't found any Delphi compatible sample code or a dll with Delphi headers for this format, any hints?

I think this issue has to do with the integrated debugger an some form of optimization microsoft changed in Windows 10. More info from Marco. If I disable the integrated debugger then running from inside Delphi works at the same speed as if I run it externally, so I don't think that having D7 installed under the program files folder is the cause of this issue. I tried setting "delphi32.exe" in Win7 compatibility mode, but it didn't help. I even tried running externally and then connecting the debugger, but as soon as new DLLs are loaded (playing a media file using directshow), everything is the same slowness. My problem running in a VM is that I'm developing a media player and as such, it uses a lot of hardware acceleration features and running under a VM will be a headache. And a media player needs internet access for streaming and opening a Win7 machine to the internet is a bit dangerous nowadays when security patches are no longer released. Any other ideas?

@FPiette My application has over 100 keyboard macros, many dynamically created UI elements (skinned buttons) and even a TCP/IP control API (used for remote control) that can trigger events that should not be activated while a new media is in the process of loading, I can't simply disable one button, I have to disable 100's of elements and several event triggers that may execute unwanted functionality while waiting for the javascript callback event to trigger. Sure, I can do that, but it would take a lot more work than just having WebView2 return a result synchronously like TWebBrowser is able to do. @Edwin Yip I considered CEF4Delphi, but from my initial investigation, there were several show-stoppers, including the possible illegality of including audio/video codecs required by YouTube in the compiled binary, something I'm not willing to do. With regards to the 120+ MB WebView2 download, it won't be a thing in Windows 11 as WebView2 comes pre-installed on Win11. For Win10, I offer my users a quick setup option to download and install the evergreen version of WebView2 without much hassle.

I'm not sure how event driven would help me here, I have to wait until specific data is returned from a javascript function before allowing the code to proceed. Here's a real life example: 1. A user presses "play" in my app to play content. 2. I execute a javascript function to return data on the content (e.g. duration in seconds). 3. I now need to display the a position bar on a timeline to the user, which uses a combination of duration and the current position (which isn't always "0" when starting playback of live feeds). As soon as the user presses "play", I want to block all UI interaction until I get my data back from the javascript function. Sure, I can artificially block UI interaction by disabling every UI entry point, but that would be a messy workaround when all I need is the javascript function to return the result synchronously.

I am using the microsoft's WebView2 API to embed the chromium based edge browser inside my Delphi 7 application (using Winsoft's WebView2 wrapper component). My problem is that WebView2's ExecuteScript function returns results asynchronously through a call-back function, which is a problem because my app needs to setup a few things based on the javascript function's result and can't proceed until the data is available. I couldn't find any way in Delphi to process the results synchronously without calling "Application.ProcessMessages" in a loop until the result function is triggered (I can't use "Sleep" because then the result function will never be triggered). Of course calling "Application.ProcessMessages" in a loop is not very desirable, so I'm wondering if there's a better approach?

Sorry if I wasn't clear, I was referring to DirectShow which does not use a browser component. It does use http transport and you can specify the user-agent, but it makes no difference, somehow YouTube identifies it and limits the bandwidth to unusable levels.

From what I can tell, the problem is that YouTube is now detecting non-valid clients and then putting a bandwidth limiter on the connection, making playback unpractical. At least that's I experience when trying to use the D3YD YouTube Directshow filter. I am experimenting with it now, I can get it to load the video, but I'm still not sure how to capture javascript event and send the event's data back to Delphi.

If you mean using DirectShow, there was a filter for that, but it's no longer functioning correctly after youtube changed something server-side and the developer is no longer responsive.

@Fr0sT.Brutal It's the H.264 codec and AAC audio, it's sort of gray legally, but I'd rather avoid any such hassle. @FPiette Probably around $200. It's basically a wrap-up job with minimal logic (I'm doing the YouTube/javascript code, I just need access to the component/events and bridge to javascript commands/events.