Sorry if this isn't the right place, but I have a question for those that are more experienced in using FFMPEG to compress works (I personally just use FFMPEG Batch AV Converter for single compressions because I can save prompts on it). I often come across artists who have videos that have insane bitrates, so in order to save space I usually compress those. I understand that some videos compress better than others (although I do not know why). For example I have found that Alessio as well as the genshin artists have videos that usually compress super well in that you can heavily compress the works and the loss in quality is extremely hard to notice (something like 40k-60k bitrate videos compressed to 10k-20k).
My question is directed towards 4k works. For my situation of using a 2k monitor (and a 1080p backup) is it better to compress only the bitrate or change the resolution as well? ex. a 4k 50k bitrate video to 4k 20k bitrate or 2k 20k bitrate.
I have tried with different videos, but I don't see a constant difference between the two outside the fact that I have to manipulate the Crf number placed into the prompt.
The prompt I use is below where I just remove the -vf scale if I don't want to change the resolution
-c:v libx265 -vtag hvc1 -vf scale=-1:1440 -map_metadata 0 -c:a copy -crf (number)
My process is that I usually try to shoot for 15k-20k bitrate for my compressions where I put in the video and start with a crf value of around 15, let it run for a few seconds for it to average the estimated bitrate then cancel it to modify the crf up or down accordingly to try to reach the goal. Is there another way to do this instead of just trial and erroring the first few seconds?
I welcome any further advice as I am very much a novice at this and I don't have a good understanding of the "why." The prompt above is pretty much a copy and past I got from a forum that was manipulated a little bit.
My question is directed towards 4k works. For my situation of using a 2k monitor (and a 1080p backup) is it better to compress only the bitrate or change the resolution as well? ex. a 4k 50k bitrate video to 4k 20k bitrate or 2k 20k bitrate.
I have tried with different videos, but I don't see a constant difference between the two outside the fact that I have to manipulate the Crf number placed into the prompt.
The prompt I use is below where I just remove the -vf scale if I don't want to change the resolution
-c:v libx265 -vtag hvc1 -vf scale=-1:1440 -map_metadata 0 -c:a copy -crf (number)
My process is that I usually try to shoot for 15k-20k bitrate for my compressions where I put in the video and start with a crf value of around 15, let it run for a few seconds for it to average the estimated bitrate then cancel it to modify the crf up or down accordingly to try to reach the goal. Is there another way to do this instead of just trial and erroring the first few seconds?
I welcome any further advice as I am very much a novice at this and I don't have a good understanding of the "why." The prompt above is pretty much a copy and past I got from a forum that was manipulated a little bit.