Differences

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--- ffmpeg_notes [2019-08-02 14:06] – nik
+++ ffmpeg_notes [2021-06-19 07:31] – [image sequence → video] nik
@@ Line 1: / Line 1: @@
 ==== Ffmpeg - various notes ====
+==== add audio track to a video ====
+''ffmpeg -i input.mkv -i audio.mp3 -c copy output.mkv''
+====extract audio from mp4 as mp3====
+''ffmpeg -i input.mp4 -b:a 320K -vn output-audio.mp3''
+====avoid audio/video reencode====
+options '-c:a copy' and '-c:v copy'
 ====slo-mo video transcode (e.g. iphone)====
@@ Line 11: / Line 23: @@
 ''for file in `/bin/ls -1`; do ffmpeg -i $file -filter "setpts=6.0*PTS" -r 30 -an $file.30fps.mp4 ; done''
-====video -> image sequence====
+====video → image sequence====
 ...timelapsed (1 frame every 4 seconds)
 ''ffmpeg -i IMG_4566.MOV -r 0.25 IMG_4566_seq/output_%05d.png''
+====image sequence  → video====
+''ffmpeg -i %05d.jpg -c:v libx265 -r 25 out.mkv''
+==== concat ====
+a list of files (e.g. named files.txt)\\
+''file 'dust_and_shadow_28min.mp4' ''\\
+''file 'dust_and_shadow_black.mp4' ''\\
+then...\\
+''ffmpeg -f concat -i files.txt -c copy dust_and_shadow_30min.mp4''
+also -> https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
 ====ffmpeg filters  ====
@@ Line 133: / Line 159: @@
 ''ffmpeg -i clip.mov -i clip2.mov  -filter_complex vstack merged.mov''
-====avoid audio/video reencode====
-options '-c:a copy' and '-c:v copy'
 ====blending===
@@ Line 144: / Line 166: @@
 ====etc====
+  * tuning x265 output -> http://forum.doom9.org/showthread.php?t=172458
   * further examples -> https://hhsprings.bitbucket.io/docs/programming/examples/ffmpeg/index.html
   * An ffmpeg and SDL Tutorial or How to Write a Video Player in Less Than 1000 Lines (2015) http://dranger.com/ffmpeg/
   * various examples -> https://oioiiooixiii.blogspot.com/