![Superior drummer 2.0 midi grooves](https://cdn1.cdnme.se/5447227/9-3/screenshot_5_64e62947ddf2b306ca76f796.jpg)
Does this make sense? Or do I have just to copy the bitrate of the original file knowing that the quality haven't changed even if it was compressed? Last question.
![ffmpeg h264 codec testing ffmpeg h264 codec testing](http://4.bp.blogspot.com/-9-bVvzGpDtk/TblI5GHAkxI/AAAAAAAAABs/IpaGDWPWiqQ/s320/decode.png)
![ffmpeg h264 codec testing ffmpeg h264 codec testing](https://cdn.write.corbpie.com/wp-content/uploads/2020/08/ffmpeg-vp9-webm-seconds-h264-deadline-realtime-all-cpu-chart-1536x768.png)
I can also do 50% just by dividing the original file to 0.5. This means I am allotting 35% more data to compensate for the missing data compressed by vp9. First I compute for supposed-to-be missing percentage of the h264 codec by getting the file size of the original file and dividing it by 0.65 (this means 35%) and applying the formula used in 2-pass option in ffmpeg documentation (I am using 2-pass option to accurately achieve computed file size).
![ffmpeg h264 codec testing ffmpeg h264 codec testing](https://cdn.write.corbpie.com/wp-content/uploads/2020/08/ffmpeg-vp9-webm-size-h264-deadline-good-all-cpu-chart.png)
In my case, I use CBR by using " -x264-params "nal-hrd=cbr" ". So if I were to re-encode a vp9 clip, do I need to compensate the missing bitrate compressed by vp9 codec? I did try to use -qp option and it was unreasonable for me because if I use constant qp the bitrate goes so much higher and I think it's just a waste of storage without getting any more quality out of it and I also have no plan on using crf because I saw some articles that sometimes it ruins some part of the video. I know that every time you re-encode something the quality degrades but my question is do I have to compensate for the compressed data made by the vp9 codec to retain most quality? As far as I know vp9 codec is good for compressing video without loosing quality (about 20% to 50% efficiency).
![ffmpeg h264 codec testing ffmpeg h264 codec testing](https://www.drupal.org/files/images/ffmpeg_converter-presets_0.jpg)
I am re-encoding my 2K videos from YouTube to H264 codec (YouTube only have vp9 codec for high resolutions) and I have a question to ask.
![Superior drummer 2.0 midi grooves](https://cdn1.cdnme.se/5447227/9-3/screenshot_5_64e62947ddf2b306ca76f796.jpg)