fix ffmpeg

sound/ffmpeg.md

@@ -1,139 +0,0 @@
----
-title: "ffmpeg"
-tags: [ "Documentation", "Sound" ]
----
-# Basics 
-
-ffmpeg -i [input file] output_file.mkv
-
-The input file might be a device, such as a camera.
-
-Play video:
-
-> ffplay file.mp4
-
-#Record screen
-Take the format as 'grab the x11 screen'.
-
-> ffmpeg -f x11grab -s [screensize] -i :0.0 out.mkv
-
-Get screensize with
-
-> xrandr -q
-
-or maybe just...
-
-> ffmpeg -f x11grab -s "$(xdpyinfo | grep dimensions | awk '{print $2}')" -i :1.0 out.mkv
-
-#Add default pulse audio
-> ffmpeg -f x11grab -s [screensize] -i :0.0 -f alsa -i default out.mkv
-
-For problems, see pavucontrol.
-
-# Random online suggestion
- ffmpeg -video_size "$(xdpyinfo | grep dimensions | awk '{print $2}')" -f x11grab -i :0.0 -f pulse -ac 2 -i default ~/out.mkv
-
-# Rotate
-
-> ffmpeg -i in.mov -vf "transpose=1" out.mov
-
-0 = 90 Counterclockwise and verfical flip (default)
-1 = 90 Clockwise
-2 = 90 CounterClockwise
-3 = 90Clockwise and vertical flip
-
-# Lower Video Quality
-A crf quality of 18 is high, while 24 is low quality.
-
-ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4
-
-# convert 
-
-Check for supported formats:
-
-> ffmpeg -formats
-
-To convert from mkv to mp4 we can use a codec rather than proper conversion.  Both are wrappers around other formats, so this conversion loses less quality than other conversion types.
-
-> ffmpeg -i LostInTranslation.mkv -codec copy LostInTranslation.mp4
-
-Opus to mp3
-
-> ffmpeg -i song.opus song.mp3
-
-> ffmpeg -i video.flv video.mpeg
-
-> ffmpeg -i input.webm -qscale 0 output.mp4
-
-# Video to Audio
-
-> ffmpeg -i input.mp4 -vn output.mp3
-
-
-# Convert all mkv files to mp4
-
-> for i in *.mkv; do
-
-    > ffmpeg -i "$i" -codec copy "${i%.*}.mp4"
-
-> done
-
-
-# Change resolution
-
-> ffmpeg -i input.mp4 -filter:v scale=1280:720 -c:a copy output.mp4
-
-Or just crop:
-
-> ffmpeg -i input.mp4 -filter:v "crop=w:h:x:y" output.mp4
-
-Or aspect ratio:
-
-> ffmpeg -i input.mp4 -aspect 16:9 output.mp4
-
-Or trim to start and stop times:
-
-> ffmpeg -i input.mp4 -ss 00:00:50 -codec copy -t 50 output.mp4
-
-Indicate start times with -ss and time with -t in seconds.
-
-Or split a video into parts:
-
-> ffmpeg -i input.mp4 -t 00:00:30 -c copy part1.mp4 -ss 00:00:30 -codec copy part2.mp4
-
-
-# Compress Video
-
-> ffmpeg -i input.mp4 -vf scale=1280:-1 -c:v libx264 -preset veryslow -crf 24 output.mp4
-
-# Extract Images from Video
-
--r sets the frame rate, and -f selects the format.
-
-> ffmpeg -i input.mp4 -r 1 -f image2 image-%2d.png
-
-# Add Images to Audio
-
-> $ ffmpeg -loop 1 -i inputimage.jpg -i inputaudio.mp3 -c:v libx264 -c:a aac -strict experimental -b:a 192k -shortest output.mp4
-
-# Create a Video from Multiple Parts
-
-First make a text file indicating all the parts, e.g.
-
-```
-
-file /home/sk/myvideos/part1.mp4
-file /home/sk/myvideos/part2.mp4
-file /home/sk/myvideos/part3.mp4
-file /home/sk/myvideos/part4.mp4
-
-```
-
-Then join with:
-
-> ffmpeg -f concat -i join.txt -c copy output.mp4
-
-# Add Subtitles
-
-> fmpeg -i input.mp4 -i subtitle.srt -map 0 -map 1 -c copy -c:v libx264 -crf 23 -preset veryfast output.mp4
-

vision/ffmpeg.md

@@ -1,14 +1,17 @@
+---
+title: "ffmpeg"
+tags: [ "Documentation", "Sound", "Vision" ]
+---
 # Basics 
 
+Translate a media file to a new type.
+
 ffmpeg -i [input file] output_file.mkv
 
 The input file might be a device, such as a camera.
 
-Play video:
-
-> ffplay file.mp4
-
 #Record screen
+
 Take the format as 'grab the x11 screen'.
 
 > ffmpeg -f x11grab -s [screensize] -i :0.0 out.mkv
@@ -39,6 +42,7 @@ For problems, see pavucontrol.
 3 = 90Clockwise and vertical flip
 
 # Lower Video Quality
+
 A crf quality of 18 is high, while 24 is low quality.
 
 ffmpeg -i input.mp4 -vcodec libx264 -crf 20 output.mp4