Unterschiede

Hier werden die Unterschiede zwischen zwei Versionen angezeigt.

--- public_v6:super8 [2021/11/06 08:49] – [Super 8 Filmscanner] admin
+++ public_v6:super8 [2025/01/18 21:58] (aktuell) – [ffmpeg -> swf] admin
@@ Zeile 34: / Zeile 34: @@
 <code bash>
-ffmpeg -i VID_20180208_142855.mp4 -vf vidstabdetect=stepsize=5:shakiness=8:accuracy=15:result=transform_vectors.trf -f null -
+ffmpeg -i VID_20180208_142855.mp4 -vf vidstabdetect=stepsize=5:shakiness=8:accuracy=15:result=transform_vectors.trf \
+-f null -
 </code>
@@ Zeile 40: / Zeile 41: @@
 <code bash>
-ffmpeg -i input.mp4 -vf vidstabtransform=input=transform_vectors.trf:zoom=2:smoothing=12,unsharp=5:5:0.8:3:3:0.4 -c:v libx265  -preset slow -crf 23 -acodec copy smooth_output.mp4
+ffmpeg -i input.mp4 -vf vidstabtransform=input=transform_vectors.trf:zoom=2:smoothing=12,unsharp=5:5:0.8:3:3:0.4 \
+-c:v libx265  -preset slow -crf 23 -acodec copy smooth_output.mp4
+#encodig for dumb H.264 players, audio-codec: aac
+ffmpeg -i input.mp4 -vf vidstabtransform=input=transform_vectors.trf:zoom=2:smoothing=12,unsharp=5:5:0.8:3:3:0.4,format=yuv420p \
+-c:v libx264 -crf 26 -preset slower -c:a aac -movflags +faststart output.mp4
 </code>
@@ Zeile 52: / Zeile 57: @@
 **Split-screen video (left side from first, right side from second video**
 <code bash>
-ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "[0:v]crop=iw/2:ih:0:0[left];  [1:v]crop=iw/2:ih:ow:0[right]; [left][right]hstack" merged.mp4
+ffmpeg -i input1.mp4 -i input2.mp4 -filter_complex "[0:v]crop=iw/2:ih:0:0[left];  [1:v]crop=iw/2:ih:ow:0[right]; \
+[left][right]hstack" merged.mp4
 </code>
@@ Zeile 77: / Zeile 83: @@
 <code bash>
-fmpeg -i input.mov -c:v libx264 -crf 26 -preset veryslow -c:a aac -vf format=yuv420p -movflags +faststart output.mp4
+ffmpeg -i input.mov -c:v libx264 -crf 26 -preset slower -c:a aac -vf format=yuv420p -movflags +faststart output.mp4
+</code>
+Resize to 1080: ''-vf scale=1920:1080'', tune for slideshow: ''-tune stillimage'' (it seems only one -vf filter can be applied).\\
+''-t 300'' encodes 5 minutes for quick quality control:
+<code bash>
+ffmpeg -i input.mov -t 300 -vf scale=1920:1080 -crf 26 -tune stillimage -c:a aac -movflags +faststart output1080.mp4
 </code>
@@ Zeile 91: / Zeile 104: @@
   * https://stackoverflow.com/questions/20194270/convert-compressed-swf-to-mp4
   * https://stackoverflow.com/questions/39301315/convert-swf-to-mp4/39304403#39304403
+==== MP4 video zu MP3 ====
+  ffmpeg -i video.mp4 -vn audio.mp3
+  * https://superuser.com/questions/332347/how-can-i-convert-mp4-video-to-mp3-audio-with-ffmpeg