I just read Recommended upload encoding settings article from official google support. I think this is the best settings for encoding my youtube videos.
Can you help me find out how to encode that settings in ffmpeg for 720p or 1080p videos?
Here's the settings
Thanks in advance.
Use
ffmpeg -i in.mp4 -vf yadif,format=yuv420p -force_key_frames "expr:gte(t,n_forced/2)" -c:v libx264 -crf 18 -bf 2 -c:a aac -q:a 1 -ac 2 -ar 48000 -use_editlist 0 -movflags +faststart out.mp4
-vf specifies video filters
yadif will deinterlace videos if they're interlaced.
format=yuv420p will produce pixel format with 4:2:0 chroma subsampling.
-force_key_frames "expr:gte(t,n_forced/2)" will place keyframes every half-second, so that will be the GOP size.
-c:v libx264 will use the x264 encoder to produce a H264 video stream.
-crf 18 will produce a visually lossless file. Better than setting a bitrate manually.
-bf 2 will limit consecutive B-frames to 2
-c:a aac will use the native encoder to produce an AAC audio stream.
-q:a 1 sets the highest quality for the audio. Better than setting a bitrate manually.
-ac 2 rematrixes audio to stereo.
-ar 48000 resamples audio to 48000 Hz.
-use_editlist 0 avoids writing edit lists.
-movflags +faststart places moov atom/box at front of the output file.
ffmpeg -i in.mp4 -vf yadif,format=yuv422p -force_key_frames expr:gte(t\,n_forced/2) -c:v libx264 -b:v <60M for 1080, 50M for 720, 15M for SD> -bf 2 -c:a flac -ac 2 -ar 44100 -use_editlist 0 -movflags +faststart out.mp4.
(t\,n_forced/2) are interpreted as a command?
Commented
Nov 15, 2019 at 6:36
expr:gte(t\,n_forced/2) in single or double quotes, I guess