Differences

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--- software:video [2011/11/01 20:51]
cyril [Audio]
+++ software:video [2024/05/12 22:48] (current)
cyril [ffmpeg]
@@ Line 1: / Line 1: @@
 ====== Multimedia encoding ======
-===== Windows =====
-VirtualDub
+===== Images =====
-===== Linux =====
+==== convert ====
+=== size operations ===
-==== Images ====
-=== convert ===
-== size operations ==
   * resize: scale image<code>
@@ Line 22: / Line 17: @@
 </code>
-== Annotate an image with text==
+=== Annotate an image with text ===
 Simple text:
 <code>
@@ Line 39: / Line 34: @@
 </code>
-== Append images ==
+=== Append images ===
 <code>
@@ Line 53: / Line 48: @@
 </code>
-== Formats ==
+=== Create animated GIF ===
+<code>convert -delay 50 -loop 0 *.jpg out.gif</code>
+=== Formats ===
   * EPS to RGB:<code>
 convert -density 600x600 -flatten -depth 8 -colorspace RGB file.eps ppm:- | convert - file.png
 </code>
-=== Exif ===
+==== Exif ====
-== exiftool ==
+=== exiftool ===
   * restore exif Orientation tag: if you have photos captured with a device that sets the orientation tag, but you used a viewer that doesn't use this tag, and rotated the image with a software that doesn't update this tag, then the image is inconsistent and is not well displayed in exif-aware viewers. To reset the orientation tag, you can use the following command:<code>
 exiftool -overwrite_original -Orientation="Horizontal (normal)" <file>
@@ Line 65: / Line 64: @@
-==== Video ====
+===== Video =====
-=== mencoder ===
+==== mencoder ====
 (comes with mplayer).
@@ Line 80: / Line 79: @@
 </code>
-== Input data and options ==
+=== Input data and options ===
   * Video files<code>
 mencoder \
@@ Line 108: / Line 107: @@
     * ''-vf yadif=0'' : deinterlace
     * ''-vf scale=640:480'' : scale video
+    * ''-vf crop=w:h:x:y'' : crop video
+    * ''-vf "crop=640:360:0:60,scale=1280:720"'' : multiple video filters
     * ''-vf pp=?'' : post processing subfilters
-== Output data and options ==
+=== Output data and options ===
 Specify the video codec with ''-ovc'' option, and audio codec with ''-oac'' option. ''copy'' is possible with both.
@@ Line 153: / Line 154: @@
 </code>
-== Other operations ==
+=== Other operations ===
   * cut the file (here from 10'00" to 10'30"):<code>
@@ Line 159: / Line 160: @@
 </code>
-=== AviDemux ===
+==== ffmpeg ====
+  * video codec: ''-c:v libx264'' or ''-c:v libxvid''
+  * audio codec: ''-c:a pcm_s16le'' or ''libmp3lame'' for video codec
+  * codec bitrate: video ''-b:v 800k'', audio ''-b:a 128k''
+  * codec quality: video ''-q:v 20'', audio ''-q:a 90'', x264 ''-crf 20''
+  * crop: ''-vf "crop=640:360:0:60"''
+  * resize: ''-vf "scale=1280:720"''
+  * pad: ''-vf "pad=1280:720:370:0"''
+  * rotate: ''-vf "transpose=2"'' (0=CCW+VF, 1=CW, 2=CCW, 3=CW+VF)
+  * blur: ''-vf boxblur=10:1''
+  * overlay two videos:<code>
+ffmpeg -i in1.avi -vf "movie=in2.avi [b]; [in][b] overlay=320:0"
+</code><code>
+ffmpeg -i in1.avi -i in2.avi -filter_complex "[0:v][1:v] overlay=320:0"
+</code>
+  * append side by side two videos:<code>
+ffmpeg -i in_left.avi -vf "pad=1280:480 [left]; movie=in_right.avi [right]; [left][right] overlay=640:0" -c:v libx264 -b:v 800k out.avi
+</code>
+  * encode video from images sequence (eg for timelapse):<code>
+ffmpeg -r 50 -i 01/all/image_1_%07d.pgm -c:v libx264 -b:v 800k video_01.avi
+ffmpeg -r 10 -pattern_type glob -i "*.JPG" -c:v libsvtav1 -qp 20 video.mp4
+</code>
+  * cut clip (ss is start time, t is duration):<code>
+ffmpeg -i in.avi -ss 00:00:23 -t 00:00:19 -vcodec copy -acodec copy out.avi
+</code>
+  * render subtitles (requires to be compiled with libass): ''-vf "subtitles=in.srt"''
+  * transform portrait video 640x480 to landscape 1280x720 with blurry repeated sides:<code>
+ffmpeg -i in.avi -filter_complex "[0:v] transpose=2,scale=1280:720,boxblur=10:1 [bg]; [0:v] transpose=2,scale=540:720 [fg]; [bg][fg] overlay=370:0 [out]" -map
+'[out]' -map 0:a -c:v libx264 -b:v 2000k -c:a copy out.avi
+</code>
+==== AviDemux ====
 A GUI easier to use, like VirtualDub for Windows.
-==== Audio ====
-=== mp3 ===
+==== PhotoFilmStrip ====
+==== Kdenlive ====
+Tried Openshot and Cinelerra but seem crappy, Kdenlive seems to have better design.
+  * Transitions : works between two video tracks that overlap (eg dissolve).
+  * Audio track volume : add effect "Audio Correction / Volume (keyframable)", then double click to add modification points.
+===== Audio =====
+==== mp3 ====
 => ''lame''
@@ Line 174: / Line 224: @@
 </code>
-=== ogg ===
+=> ''mp3cut''
+To cut an mp3 file (warning: ID3 tags are not copied):
+<code bash>
+mp3cut -o output.mp3 -t 00:00:05+700-00:00:07+800 input.mp3
+</code>
+To concatenate mp3 files:
+<code bash>
+mp3cut -o output.mp3 input1.mp3 input2.mp3 input3.mp3
+</code>
+=> ''id3cp''
+To copy ID3 tags from a file to another one.
+=> ''id3v2''
+To view and edit ID3 tags in command line.
+=> ''kid3''
+To view and edit ID3 tags in GUI.
+==== ogg ====
 (using vorbis-tools package)
@@ Line 189: / Line 264: @@
 </code>
-=== sox ===
+==== sox ====
-play,record,process
+play, record, process
+  * Cut: (start position / length)<code>
+sox in_file.wav out_file.wav trim 2:37:32 4:00
+</code>
+  * Reencode:<code>
+sox in_file.type1 out_file.type2
+sox in_file.type1 -t type2 - | oggenc ...
+</code>
-=== ffmpeg ===
+==== ffmpeg ====
   * extract sound track from video: <code>
 ffmpeg -i video.avi sound.mp3
 </code>