Fantastic, thank you. I'm going to take time to get my head around that example and see what I can come out with

This will be fixed in the upcoming Qt 6.8 release, and is back-ported to 6.7.2. See https://bugreports.qt.io/browse/QTBUG-125006, which adds a check for the QT_FFMPEG_PROTOCOL_WHITELIST environment variable, which the user can set to override the whitelist with their own.

@eramne Is it working for you now? I've got a problem linking FFmpeg with static Qt, which I've logged at https://bugreports.qt.io/browse/QTBUG-115052 but if it's working for you, feel free to mark this as Solved

@SGaist Yes in case of Qt 6.5.0, but this also happens with Qt 6.3.1, although the error I can read from QMediaPlayer is different:

Qt 6.5.0: QMediaPlayer::ResourceError Qt 6.3.1: QMediaPlayer::FormatError

Edit:
The root cause of this issue was connected to file types and the way my url was constructed. I opted to use the native darwin backend with Qt 6.5 instead of the new ffmpeg, at least until 6.5.1 is out and I can do further testing. Thank you for the valuable input (as always!).

@sethsource same with HLS

@Saviz
For the questions about what command line arguments you might want to pass to it you might be better asking in a forum for ffmpeg.

When running a command whose output you are interested in you should always read both standard output and standard error.

If you do not need to process them separately you might use QProcess::MergedChannels. But not if you need to parse them distinctly.

If you want the output you show, and ffmpeg does not offer this, parse the output to produce what you want.

@DungeonLords
What is your question? Your code runs a bash -c "....", which is fine. Your linked output shows libGL errors. What happens if you run

ffmpeg -y -f lavfi -i testsrc=size=1280x720:rate=1:duration=10 -vcodec mjpeg -pix_fmt yuvj422p -f mjpeg input.yuvj422p

from a shell? If that errors what is the relevance of Qt or QProcess?

Ok, just to finalize this. Instead of the cmake code I attached above to link FFmpeg libraries, I used the same FindFFmpeg.cmake file that used by OBS Studio project on GitHub, and it worked as expected!

I don't know what is the difference yet, I need to read through it carefully and find the differences.

@SGaist Yes that was what I was trying. But I found the error. SampleFormat was set to Unknown instead of Int16. Now I only need to syncronize and write audio in the right rate

Hi and welcome to devnet,

Not related to Qt bug depending on what you want to use from ffmpeg you should rather install it using e.g. macports or brew.

@Chris-Kawa thanks for the hint. Works now :)

Hi and welcome to devnet,

You can implement a QtMultimedia backend that will use ffmpeg to read your video source or maybe the QtAV project might be of interest.

Hope it helps

@Wieland

These didn't help either:

sudo apt-get install gstreamer1.0-* sudo apt-get install libav-tools ffmpeg vlc

I submitted a question on Qt pipelining. The thing that bothers me is I cannot get QtMultimedia work on a clean installation.

Nevertheless, I might abandon QtMultimedia and use some other library to embed the video in my Qt application (e.g. VLC-Qt).