Under version Qt5.2, I used QtWebView, it can call third-party extensions automatically to support video formats such as avi, mpeg, mov and flv. But when I upgraded to Qt5.10 and changed QtWebView to QtWebengineView, it worked differently and I couldn't call third-party extensions. If I want to modify chromium source with ffmpeg to support all video formats for QtWebengine, what should I do?
If you are building Chromium using the official build instruction, then you just need to add the following options to the args.gn file:
proprietary_codecs=true
ffmpeg_branding="Chrome"
You needn't to use ffmpeg to support all video formats.
Like Vladimir said, follow the official build instructions and the audio/video page.
@Vladimir: I don't think you can enable support of the video & audio formats that aren't supported by Google Chrome.
Yes, you can. We compile Chromium with all codecs (AVC/H.264, HEVC/H.265, MPEG-4...) and can open many other file types (MOV, AVI, MKV, M2TS...). Follow our instructions (GN flags) and you will be able to build Chromium with all codecs. HEVC/H.265 is more complex. Check Chromium binaries and file type checker. All is completely free and open-source. Do it yourself! ;)
For QtWebEngine all you need to do is configure Qt to enable proprietary codecs using -proprietary-codecs (< Qt 5.12) or -webengine-proprietary-codecs (Qt 5.12+)
If you additional configure with -system-webengine-ffmpeg you will also use the system FFmpeg with all the codecs it supports. It still won't support any container formats Chrome doesn't though.
来源：https://stackoverflow.com/questions/50971187/can-i-build-chromium-with-ffmpeg-to-support-all-video-formats