Placebo is producing a larger output from the same input file and settings than Veryslow job! Heck if ffmpeg had a Ludicrous preset that took a similar job 24-48hours for a 4% gain I'd be using it.īut just to see how much better Placebo has been doing, I ran a duplicate Veryslow job. Zeranoe Static Win32 build (linked from this site)įfmpeg-20151013-git-d59bfcd-win32-static.7zĪ slower preset will provide better compressionĪs time for me isn't a factor compared to quality and file size, I'll take that ~1% better Placebo should do over Veryslow. % ffmpeg -i input -preset placebo -crf 18 -c:v libx264 output Shell scripts to build FFmpeg for iOS and tvOS. % ffmpeg -i input -preset veryslow -crf 18 -c:v libx264 output-Vs kewlbear / FFmpeg-iOS-build-script Goto Github PK View Code Open in 1sVSCode Editor NEW 2.9K 158.0 838.0 55 KB. Expected behavior After applying custom build with iOS.sh script, conversion speed should be the same as mobile-ffmpeg-full > 4.2.1 pod. Everything has worked fine but conversion speed becomes much slower than the mobile-ffmpeg-full > 4.2.1 one. % ffmpeg -i input -preset slower -crf 18 -c:v libx264 output-Sr After successfully completing the custom build I imported all frameworks and run it on an iOS device. # where we will keep our sources and build from.% ffmpeg -i input -preset slow -crf 18 -c:v libx264 output-S It takes about 22 seconds (speed6x) and with 20 MB file size. Use preset, you can easily speed up FFmpeg with larger file size, which is acceptable when you have enough space left in your hard disk. # Where we'll end up storing things in the end With -preset to speedup with larger file size. # necessary bits from the libraries we create As to your second question, hardware encoding is only available via avfoundation, you can use avassetwriter to. There are a number of factors that contribute to av/sync issues, usually some type of pre-buffering of the video is required, also network plays a big part in it. # No need to change this since xcode build will only compile in the We use ffmpeg to do rtsp/rtmp and we get good performance with h264/aac. # Choose your ffmpeg version and your currently-installed iOS SDK version:
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