![]() ![]() N=1, so take the results with a grain of salt and perform your own tests. With -preset veryslow -crf 28, I get a file of 39M which took 5m47s (with no visual quality difference to me).With both -b 512k and -preset veryslow, the size becomes 77M (100K smaller than just -b 512k).For example, a 100Mb file would become 25Mb if you select 25. Select a target file size as a percentage of the original. Since bitrate file size / duration: (2. Choose 'Target a video quality' when quality is of importance. Your video is 10 minutes (600 seconds) long and an output of 200 MiB is desired. With only -preset veryslow (and no -b), it became 70M (encoding time: 6m14s) 1 Try the following which was only just watchable on my system: ffmpeg -i input.mp4 -c:v libx264 -tune zerolatency -preset ultrafast -crf 40 -c:a aac -b:a 32k output.mp4. Choose 'Target a file size' to get an exact output file size.With only -b 512k added, the size dropped to 77M (encoding time: 1m17s).With no special options: 95M (encoding time: 1m19s). ![]() The results, taking the same 1024x768 as base (and applying cropping, scaling and a filter): In order to reduce size, I lowered the resolution to 480x480. ago I know this is a little late, but VP9 doesnt play within discord on a iPhone. Changing the quality in the below steps may influence the bitrates, but still the data reduction should be significant. ![]() ago You should be using WebM with VP9 instead for better compression. Also, the data rate savings will be quite drastic if youre going from a 10 MBit/s DVD to around 12 MBit/s for H.264 video and 0.51 MBit/s for H.265 video. It has a duration of about 20 minutes with a resolution of 1024x768 (with half of the video being blank, so I cropped it to 768x768). 10 4 comments Best Add a Comment Zipdox 6 mo. The recorded video was originally 673M in size, taken on an iPad using RecordMyScreen. Try to aim below the bitrate that you want. Since bitrate file size / duration: (2. 1 Encoding to a specific size is hard, sometimes, data is just not more compressabale than it is already. I also found Video encoder comparison at KeyJ's blog ( archived version) an interesting read, it compares H.264 against Theora and others.įollowing is a comparison of various options I tried. Your video is 10 minutes (600 seconds) long and an output of 200 MiB is desired. Instead of chosing fixed bit rates, with the H.264 codec, you can also chose a different preset as described at. ![]()
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