[digikam] [Bug 487031] New: Unable to play h264 videos on apple silicon mac

[brancaleone]

https://bugs.kde.org/show_bug.cgi?id=487031

            Bug ID: 487031
           Summary: Unable to play h264 videos on apple silicon mac
    Classification: Applications
           Product: digikam
           Version: 8.3.0
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Preview-Video
          Assignee: digikam-bugs-null at kde.org
          Reporter: cedric.devillers at gmail.com
  Target Milestone: ---

SUMMARY

When trying to display h264 videos from my digital camera (lumix gx9) nothing
is shown in preview. Metadata are correctly reported. Same video where
displayed correctly on previous versions.

When enabling logging this message is displayed continuously on the console : 

FFmpeg: [h264 @ 0x7f8f05827000] hardware accelerator failed to decode picture

using null output device, none available
using null output device, none available

I've seen that a similar bug has been reported on ffmpeg track some time ago :
https://trac.ffmpeg.org/ticket/9713.
The patch fixing this is included on ffmpeg branches 6.0 and up.
I've noticed that the ffmpeg executable embeded in the macos package is version
4.4.4.

I've tried the 8.4.0 preview version and the bug is the same (but audio is ok
on that version).

Would it be possible to upgrade ffmpeg to avoid this bug on apple silicon macs
?

STEPS TO REPRODUCE
1. Try to preview a mp4 video using h264 codec from a panasonic camera (4k30p
100Mb/s)

OBSERVED RESULT
No video is show (also no sound but it's a different bug fixed in 8.4.0
already)


SOFTWARE/OS VERSIONS
macOS: Sonoma 14.4 on M2 max.

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