Quality loss when converting pro res to mp4

Hi
I have a problem with the workflow from After Effects to a final .mp4 video.
I have been editing time lapses in After Effects, and exporting them as Pro Res HQ- all good so far. However, I can´t seems to be able to convert the Pro Res file to a .mp4 (or quick time .mov for that matter) without significant quality loss. This happens if I convert using adobe media encoder, or if I import the Pro Res files to Premiere and export through Premiere.
However, if I import the original JPG/TIFs to Premiere, and export using the exact same setting- I get a better result. Also, when I have uploaded the original Pro Res HQ file to vimeo, they do a much better job of converting it than Media Encoder or Premiere do when I convert to .mp4 (I´m aware that it is not the same conversion, but still..).
So my conclusion must be that AME and PP does not convert from Pro Res to other codecs very well? I have to work on my files in AE, and I need .mp4 as the final product (requirement for uploading to a stock site). How do I do this without getting lower quality video than if my workflow and export was only in Premiere? After Effects does not render out .mp4 very well it seems...
A screenshot showing the setting I use when exporting from PP or AME. The settings produce a good result when exporting other files from PP, but not the Pro Res files I have exporter from AE.
Thanks for your input!

Figured it out after testing various settings. I read an article describing the keyframe interval setting at 1 as the best option- clearly that was wrong! After searching I found a better description of keyframe interval: "Having too many keyframes severely reduces quality, because the efficiency of reusing image areas from previous frames is completely lost at each keyframe – the encoder has to "start over" at every keyframe. Therefore, we want as few keyframes as possible to achieve the highest quality for the given target bitrate."
Tested with keyframe settings 25 and 75- both seem fine.
Thanks for the feedback

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    Hi
    I have a problem with the workflow from After Effects to a final .mp4 video.
    I have been editing time lapses in After Effects, and exporting them as Pro Res HQ- all good so far. However, I can´t seems to be able to convert the Pro Res file to a .mp4 (or quick time .mov for that matter) without significant quality loss. This happens if I convert using adobe media encoder, or if I import the Pro Res files to Premiere and export through Premiere.
    However, if I import the original JPG/TIFs to Premiere, and export using the exact same setting- I get a better result. Also, when I have uploaded the original Pro Res HQ file to vimeo, they do a much better job of converting it than Media Encoder or Premiere do when I convert to .mp4 (I´m aware that it is not the same conversion, but still..).
    So my conclusion must be that AME and PP does not convert from Pro Res to other codecs very well? I have to work on my files in AE, and I need .mp4 as the final product (requirement for uploading to a stock site). How do I do this without getting lower quality video than if my workflow and export was only in Premiere? After Effects does not render out .mp4 very well it seems...
    A screenshot showing the setting I use when exporting from PP or AME. The settings produce a good result when exporting other files from PP, but not the Pro Res files I have exporter from AE.
    Thanks for your input!

    You should ask in the forums of the programs you are using
    The Cloud forum is not about using individual programs
    The Cloud forum is about the Cloud as a delivery & install process
    If you will start at the Forums Index https://forums.adobe.com/welcome
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