FFmpeg's nearly unlimited output causes ffmpeg-sidecar to hang without a timeout

[wikke]

I'm converting a video(with some strange .ts extension) to a 3-seconds gif using ffmpeg-sidecar. Command like

ffmpeg -loglevel level+warning -hide_banner -i "/path/to/bipbop-gear1-all.ts" -t 3 -an -vf "fps=10,scale=-1:200:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=164:stats_mode=diff[p];[s1][p]paletteuse=dither=floyd_steinberg:diff_mode=rectangle" -compression_level 9 -quality 85 -c:v gif -y "/path/to/thumbnail.gif"

However, ffmpeg cli output nearly unlimited lines of warning, like

[Parsed_palettegen_4 @ 0x600001574bb0] [warning] The input frame is not in sRGB, colors may be off
[Parsed_palettegen_4 @ 0x600001574bb0] [warning] The input frame is not in sRGB, colors may be off
...(tons of lines...)
[Parsed_palettegen_4 @ 0x600001574bb0] [warning] The input frame is not in sRGB, colors may be off
[Parsed_palettegen_4 @ 0x600001574bb0] [warning] The input frame is not in sRGB, colors may be off

but, ffmpeg cli just exits(not sure exit 0 or not 0) after about ~7 seconds, which I think reasonable.

When it comes to ffmpeg-sidecar in Rust

    let exit_status = FfmpegCommand::new()
        .args([
            "-loglevel", "level+warning",
            "-hide_banner",
            "-i", filepath,
            "-t", "3",
            "-an",
            "-vf", "fps=10,scale=-1:200:flags=lanczos,split[s0][s1];[s0]palettegen=max_colors=164:stats_mode=diff[p];[s1][p]paletteuse=dither=floyd_steinberg:diff_mode=rectangle",
            "-compression_level", "9",
            "-quality", "85",
            "-c:v", "gif",
            "-y",
            &thumbnail_path_buf.to_string_lossy()
        ])
        .spawn()?
        .wait()?;

    if exit_status.success() {
        Ok(...)
    } else {
        Err(...)
    }

FfmpegCommand(FfmpegChild maybe) thread just hangs at .wait()?

Maybe adding timeout parameter would be better? like the ffmpeg cli do internally? Or, I have to set a timer, and invoke handle FfmpegChild.quit/kill(maybe) when timeout, not very convenient.

You can download the test video at http://www.live555.com/liveMedia/public/h264-in-mp2t/bipbop-gear1-all.ts

[nathanbabcock]

Thanks for providing a test video, I will take a look.