|
|
|
|
|
|
by cm2187
1901 days ago
|
|
|
mine: h264:
-c:v libx264 -preset medium -crf 22
h265:
-c:v libx265 -preset medium -crf 26
no recompress:
-c copy
presets:
ultrafast,superfast, faster, fast, medium, slow, slower, veryslow
desinterlace:
-vf yadif
target size:
-s 1920x1080
aspect ratio without recompressing:
-aspect 16:9
rotate video:
-vf "transpose=1"
0 = 90CounterCLockwise and Vertical Flip (default)
1 = 90Clockwise
2 = 90CounterClockwise
3 = 90Clockwise and Vertical Flip
rotate without recompressing:
-metadata:s:v rotate="90"
audio aac two channels:
-c:a aac -b:a 160k -ac 2
web fast start:
-movflags +faststart
autoscale to WxH with black bands:
-vf "scale=W:H:force_original_aspect_ratio=decrease,pad=W:H:(ow-iw)/2:(oh-ih)/2"
get jpeg snapshot:
-vframes 1 -q:v 2 dest.jpg
concatenate mp4 without recompressing:
-f concat -safe 0 -i "files.txt" -c copy -movflags +faststart
files.txt format:
file 'filepath'
ffprobe get videoinfo:
ffprobe -v quiet -print_format xml -show_format -show_streams "filepath" > file.xml
if override which sub track is default, use "-default_mode infer_no_subs"
clear disposition (default sub):
-disposition:s 0
default or forced disposition:
-disposition:s forced
track metadata (audio):
-metadata:s:a title="xx"
track metadata (video):
-metadata:s:v title="xx"
global metadata:
-metadata title="xx"
-metadata description="xx"
-metadata comment="xx"
extract sound from video to mp4
ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 sound.mp3
skip time (place after input file):
-ss 00:05:00
stop after:
-t 00:05:00
Approx fast seek (place before input file):
-ss 00:05:00 -noaccurate_seek -i ....
|
|
|