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you have the wrong build of FFMPEG.EXE in the portable zip distribution... not checked the installer yet... You have a 64bit edition of FFMPEG.EXE included which will NEVER RUN under a 32bit edition of windows. The main executable runs happily under 32bit Vista SP2+ and will likely operate under 32bit XP SP3 or even Windows 2000 just need a compatible 32bit build FFMPEG.EXE to do all the grunt work for you. In addition you need one more profile to extract the audio stream AS IS no re-encoding that will produce the best possible quality at the smallest possible file size. ANY re-encoding will either reduce audio detail (quality) or increase audio track size e.g. lossy codec can be made to reduce file size but will in every circumstance lose quality and FLAC might maintain detail level but it will produce a larger file with probably less features like no 5.1 DTS... ALso as usual save location should NOT be the users desktop but should be a subfolder of the users MUSIC folder where all audio files should be. I have replaced your 64bit FFMPEG.EXE with your version 4.3 32bit FFMPEG.EXE and not it works under 32 bit windows Vista like it should apart from the omissions and bugs mentioned above. Spotted another programming choice error, when selecting the output destination FOLDER you have chosen to use a FILE selection dialog and cut it down so it sort of produces the desired effect rather than use the official folder selection dialog with the added create new folder button. Also with the audio presets settings you should add bit width for at least 16bit, 24bit, 32bit, and I think a floating point option of either 32 or 64bit I could use always free XMedia re-code to do what this does and add some basic trimming features too.

none of the items offered in that minitool giveaway disclose giveaway license duration prior to installation and activation of supplied license code... It is well known you don't impose expiring licenses in your giveaways but many of the others could and probably do. I'll probably activate a portable zip from here with the license from the minitool giveaway but I won't waste my systems resources and time on all the unknown items in the giveaway... I don't enjoy gambling! Yes I know you are not responsible for all the other items appearing in the giveaway but they don't have a comments section on the giveaway page :-(

default image folder for both loading and exporting images should be Pictures and not Documents and exporting videos should go to users Videos folder in my humble opinion... oh and it seems to be running under 32bit vista so windows 7 does not appear to be the cut off point, The portable is using a 2019 build of FFMPEG.EXE which is fine under XP and Vista in it's ffmpeg.org project format.

seems it's "system audio" capture method that was causing the audio/video sync issue, capturing via the hardware realtek stereo mixer input using another instance of FFMPEG.EXE to capture it remained in sync but using the alternate audio capture of "system audio" which I presume captures the audio using the main executable does not appear to retain sync with FFMPEG.EXE captured video. I await future versions to see what improves.

Trying to debug this... I'm using the portable build under Win10 latest feature set and properly patched. The program fails to record Audio from the microphone Array in the laptop, no idea if it's the API or the sample depth and rate it's balking at as there are no settings for Audio capture for each device within the program so one assumes it uses the record settings from Sounds applet. It also drops mp4 video files into the programs folder and keeps them there if the entire creation reconstruction of the video track and sound track does not succeed which creates a mess the end user has to clean up.. Also on every launch it goes through a lengthy initialization process of bench marking the various h264 and h265 hardware acceleration options available before handing the user interface back to the end user... If such a process IS really required the results should be stored in Settings.ini and it never repeated again unless the settings.ini is deleted OR it is moved to different hardware, since it is sort of portable even if the license is not. had a bit more success with capturing to MKV but the sound track was seconds delayed from the video on screen activity and had to give it permission to write to the Videos folder due to controlled folder access controls which is not an issue. But the not tidying up on audio capture failure or merge capture failure and the retesting of hardware acceleration on every launch and audio being seconds out of sync with the video are issues that need to be addressed, other FFMPEG capture GUI's don't seem to have these issues and also offer simultaneous webcam picture in picture and simultaneous system sounds and microphone capture. good try but really needs more work before it's a release candidate let alone a stable commercial release IMHO.

Any reason you built this as a 64bit main executable and 32bit FFMPEG.EXE where it's FFMPEG.EXE screen capture routines you use? Have you tried building it 32bit and it consumed greater than 32bit user process limit of 2GB? Or was the decision an arbitrary one for no particular reason? Also Why oh Why default to dumping captured VIDEO files onto the users Desktop instead of defaulting to somewhere normal like the Users Videos folder? would not force the end user to have to alter the default settings to avoid polluting their desktop with data files!

the system requirements on page https://vovsoft.com/software/speech-to-text-converter/ specifically state "(32-bit and 64-bit)" versions of windows but the portable build has a 64bit LGPLv3 licensed FFMPEG.EXE that cannot possibly execute under 32bit windows 7 to 10. The supplied Setup.exe has exactly the same problem a 64bit FFMPEG.EXE I presume that is used to convert varied input file formats to one standardized format for processing. Either way unless you replace that 64bit executable with a 32bit build of similar generation the program will not work as described under 32bit editions of windows, it will crash on importing sound files or just fail to import them if the error is trapped in the software. Note the software requires signing up to external platforms to use their speech to text engines and AI engines not many options exist without the use of external platforms Vosk and which requires .NET 4.8 to run and Microsofts Speech platform and it defaulted to dumping recorded wav files on my DESKTOP! Can't they use the %TEMP% variable and drop a subfolder in there Desktop is not a dumping ground for temporary recording files!

I have tried others, but this is the best.

A question how does one set the Custom output dimensions for the video? I see nothing in settings.ini or the user interface to dial in the required dimensions? Is it just the size of the largest combination of image dimensions like if one is portrait it takes the height of the biggest portrait and the width of the largest landscape image? That's as far as my imagination goes into working out how custom dimension could work if there is no GUI to specify the dimensions.

it's just a simple slideshow maker why only 64bit? 32bit windows has far more complex slideshow/non-linear video editing software for multiple decades why bother with a wasteful 64bit executable. ALL video files are 8 bit encoded datastreams meaning the handling of 8bit data in 64bits doublelong per 8bit byte allocation is many times less efficient as 32bit which was bad enough. Ahhhh the executable for the program IS 32bit but you are using your latest LGPLv3 build of FFMPEG.EXE compiled as a 64bit build for some obscure reason... so all we need to do is swap out the 64bit FFMPEG.EXE for one of your 32bit builds of your FFMPEG.EXE and it won't make the slightest bit of difference that the last 32bit build is slightly older version as you are just making a video optionally with audio file which is more than doable even with ancient builds of FFMPEG.EXE
Can I make another suggestion? Allow the frame duration to vary on a per frame basis so one can have one photo displayed for say 10.25 seconds and another for 5.12 and another for 7 seconds rather than all frames set to one single duration rate?