Differences

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--- ffmpeg_notes [2021-02-07 10:00] – nik
+++ ffmpeg_notes [2023-08-27 12:27] – nik
@@ Line 1: / Line 1: @@
 ==== Ffmpeg - various notes ====
+==== general exploration ====
+[[FFmpeg Explorer][https://ffmpeg.lav.io/]] is a tool to help you explore FFmpeg filters.
+==== 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 27: @@
 ''for file in `/bin/ls -1`; do ffmpeg -i $file -filter "setpts=6.0*PTS" -r 30 -an $file.30fps.mp4 ; done''
-====video -> image sequence====
+====video → image sequence====
 ...timelapsed (1 frame every 4 seconds)
@@ Line 17: / Line 33: @@
 ''ffmpeg -i IMG_4566.MOV -r 0.25 IMG_4566_seq/output_%05d.png''
+====image sequence  → video====
+''ffmpeg -i %05d.jpg -c:v libx265 -r 25 out.mkv''
 ==== concat ====
-a list of files (e.g. named files.txt)\\
+create a list of files (e.g. named files.txt)\\
 ''file 'dust_and_shadow_28min.mp4' ''\\
 ''file 'dust_and_shadow_black.mp4' ''\\
@@ Line 26: / Line 45: @@
 ''ffmpeg -f concat -i files.txt -c copy dust_and_shadow_30min.mp4''
-also -> https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
+alternatively, partial automation...\\
+''ls *.mp4 | while read each; do echo "file '$each'" >> files.txt; done\\
+ffmpeg -f concat -i files.txt -c copy 000-qualia-RN101.mkv''
+also -> https://stackoverflow.com/questions/7333232/how-to-concatenate-two-mp4-files-using-ffmpeg
 ====ffmpeg filters  ====
@@ Line 144: / Line 166: @@
 ''ffmpeg -i clip.mov -i clip2.mov  -filter_complex vstack merged.mov''
-====extract audio from mp4====
-''ffmpeg -i input.mp4 -b:a 320K -vn output-audio.mp3''
-====avoid audio/video reencode====
-options '-c:a copy' and '-c:v copy'
 ====blending===