stereo | Perform stereo matching algorithm using Direct 3D | GPU library

We're trying to use xdmp:document-filter function to extract metadata about PDF files, in particularly we want to know the number of pages in a PDF. It seems that currently MarkLogic is not able to retrieve this information for PDFs (nor for Word documents) but is able to get the number of slides for a PowerPoint. Maybe there is there a hidden option?

https://docs.marklogic.com/guide/search-dev/binary-document-metadata#id_98155 https://docs.marklogic.com/xdmp:document-filter

At some stage we may want to also extract metadata from audio files (MP3), such as duration in seconds and stereo/mono. Is this something that may be possible?

I am currently trying to make a .wav file that will play sos in morse.

The way I went about this is: I have a byte array that contains one wave of a beep. I then repeated that until I had the desired length. After that I inserted those bytes into a new array and put bytes containing 00 (in hexadecimal) to separate the beeps.

If I add 1 beep to a WAVE file, it creates the file correctly (i.e. I get a beep of the desired length). Here is a picture of the waves zoomed in (I opened the file in Audacity): And here is a picture of the entire wave part:

The problem now is that when I add a second beep, the second one becomes completely distorted: So this is what the entire file looks like now:

If I add another beep, it will be the correct beep again, If I add yet another beep it's going to be distorted again, etc. So basically, every other wave is distorted.

Does anyone know why this happens?

Here is a link to a .txt file I generated containing the the audio data of the wave file I created: byteTest19.txt

And here is a lint to a .txt file that I generated using file format.info that is a hexadecimal representation of the bytes in the .wav file I generated containing 5 beeps (with two of them, the even beeps being distorted): test3.txt

You can tell when a new beep starts because it is preceded by a lot of 00's.

As far as I can see, the bytes of the second beep does not differ from the first one, which is why I am asking this question.

If anyone knows why this happens, please help me. If you need more information, don't hesitate to ask. I hope I explained well what I'm doing, if not, that's my bad.

EDIT Here is my code:

2 FFMPEG process

(1) generating a ffmpeg x11grab to a .mp4 (2) take the .mp4 and restream it simultaneously to multiple rtmp endpoints

ISSUE the generated file in (1) have this error "moov atom not found"

This is the command that generate (1) :

I have ripped files from an audio CD I just bought. I ripped using the Music app on my Macbook Pro, Catalina 10.15.6 - output format was .wav as there was no option for FLAC. My plan was to change format using ffmpeg:

I am streaming audio using FFMPeg and need to mix two audio sources using FFMpeg and set the volume level dynamically. I.e. once the stream starts, I need to be able update the ratio of the two volumes.

Currently, I have the volume mixing and streaming working using the CLI version of FFMPeg but the volume mix ratio is static.

Is there a way to dynamically set the volume ratio using the CLI tool? Perhaps something with an FFMpeg expression?

Or is using the API the only option? If so, can anyone point me towards an example of dynamically mixing audio? I haven't been able to find one.

Edit: here are the params I currently pass to mix audio. Again, this works fine, so not including the log as there is no error to fix. The question is how can I adjust the ratio of the amix mix after the process has launched. Willing to use the API if need be.

I am trying to add xfade filter and the command is working but audio of second video is missing in output video.

command is -

I'm trying to convert a .ts file with this output to mkv:

I am able to stream with ffmpeg an mp4 file with h264 encoded video and aac encoded audio to flash flv output. The command I used is:

ffmpeg -re -i bigbuckbunny_HD_60fps.mp4 -c copy -f flv rtmp://192.168.3.64:1935/main/stream0

When I am trying to use the tee option to duplicate the output I am failing with an error. This is the command I use:

ffmpeg -re -i bigbuckbunny_HD_60fps.mp4 -map 0 -c copy -f tee "[f=flv]rtmp://192.168.3.64:1935/main/stream0|[f=flv]rtmp://192.168.3.64:1935/main/stream1"

However, it fails. What I am missing? The output I have from ffmpeg is:

I am able to stream with ffmpeg an mp4 file with h264 encoded video and aac encoded audio to flash flv output. The command I used is: