MediaConvert thumbnails colors

Question

Hello,
I have a strange issue with MediaConvert, where thumbnails that MediaConvert generates appear to be of different color than the actual video that MediaConvert creates.

On the left it's a frame of the video, on the right is the thumbnail generated. The behaviour is consistent for all videos, this is just an example

![Enter image description here](/media/postImages/original/IMp3yLTKvRTyKLkW5eVjwnLw)

I'm not doing any color corrections to the thumbnails, my config is simply
```{
                    Name: "File Group",
                    OutputGroupSettings: {
                        Type: "FILE_GROUP_SETTINGS",
                        FileGroupSettings: {
                            Destination: `${data.inputDirectory}/thumbnails/${data.name}`,
                        },
                    },
                    Outputs: [
                        {
                            ContainerSettings: {
                                Container: "RAW",
                            },
                            VideoDescription: {
                                CodecSettings: {
                                    Codec: "FRAME_CAPTURE",
                                    FrameCaptureSettings: {
                                        MaxCaptures: 1,
                                        Quality: 80,
                                    },
                                },
                            },
                            Extension: "jpg",
                            NameModifier: "-thumb",
                        },
                    ],
                },
```

Is this normal? Shouldn't the thumbs match the video at all times? Am I supposed to now do manual color correction with the settings?
We recently switched from AWS Elastic Transcoder and did not have the same issues there with videos that were generated in the same way

Our videos are prepared with ffmpeg & hevc_videotoolbox before being sent to MediaConvert

Answer

Two things to consider when doing frame captures, the rate of capture and the resolution. Viewing your capture config, it show a limit of 1 capture max. That one capture seems to be at a different time than your video screen capture. (See bee in flower in frame capture not present in the video.) So colors and shading may be different. You may want to set capture to once ever X secs and compare those times with the video. Also, validate that your video encoding profile does not have color parameters set, which may be different than the frame capture.

The resolution of the frame capture is typically lower than the video. This would provide a lower quality and averaging of luma/chroma over a large section. In this case, it seems that no resolution is set, so it would use the source resolution. Is that the same resolution as the video?

Please see the following link for Frame Captures with AWS Elemental MediaConvert.
https://docs.aws.amazon.com/mediaconvert/latest/ug/file-group-with-frame-capture-output.html

MediaConvert thumbnails colors

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