OSX issue: Green lines on the left side of FFLive [Apple SIlicon]

[Akascape]

Hello @ramiropolla
I would like to express my sincere gratitude for creating this tool. I am currently working with FFLive arm64 version on Mac OS Sequoia 15.4.1 (Apple Silicon)
I noticed that the FFlive window is showing some random green colored lines on the left side of the live window. (not a part of the glitch)

I also tried the x86_64 version of FFLive, and it is not showing those lines.

These are the parameters I used:

        ffgac_command = [
            ffgac,
            "-accurate_seek",
            "-ss", "0",
            "-stats",
            "-hide_banner",
            "-i", video_path, # add your video path
            "-s", f"{width_box.get()}x{height_box.get()}",
            "-an",
            "-mpv_flags", "+nopimb+forcemv", 
            "-qscale:v", "0", 
            "-g", "max",
            "-sc_threshold", "max", 
            "-vcodec", "mpeg4",
            "-f", "rawvideo", 
            "-"
        ]

        fflive_command = [
            fflive,
            '-i', '-',
             "-s", script_path, # add your js script path
            '-vf', "setpts=(1.0)*PTS",
            '-af', "setpts=(1.0)*PTS",
            '-stats',
            '-hide_banner',
            '-flush_packets', '0',
            '-sync', 'audio',
        ]
...

[ramiropolla]

Hi @Akascape, and thank you for the bug report (and for Datamosher Pro!)

I did receive a similar report from elsewhere, but I don't have an arm mac to test.

Could you try to reduce it to a minimal testcase? For example:

• Whether it still happens with fflive -i input.mpeg4
• Whether it's ffgac or fflive that introduce the problem
• Whether it happens with any input file

Try resizing the input to different dimensions (aligned to 64, 32, 16, 8, 4, 2 pixels, both vertically and horizontally) and check whether it happens with all dimensions.

I suspect it is caused by some aarch64 optimization, since it doesn't happen on x86_64.

[Akascape]

@ramiropolla
Yes, the issue appears to be related to the resolution. When the resolution was “888x500,” the lines were visible in FFlive, but when the resolution was “800x500,” they were not.

I believe that the issue is not with ffgac, as I tested both arch and ffgac did not produce any green lines in the MPEG4 video.

[ramiropolla]

Thanks! Can you upload a sample test file?
I suppose I would then have to run fflive -i input and the bug would then be visible in aarch64, but not on x86_64.

[Akascape]

Sure, here is a mpeg4 file with resolution 888x500: input.mpeg4.zip

[Akascape]

I suppose distributing x86_64 version of fflive will not create any issue for mac users using arm64 (having rosetta installed). What's your opinion @ramiropolla ?

[ramiropolla]

The x86_64 version runs slower on apple silicon.

I found the bug and found a fix from FFmpeg upstream. I cherry-picked the fix 4b71d60 but I haven't made a new build yet.