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--- videodigital:conversion:extraer_audio [2014/07/29 13:05] – jose
+++ videodigital:conversion:extraer_audio [2019/12/16 12:50] (current) – [Subir Volúmen a un vídeo] jose
@@ Line 1: / Line 1: @@
 ====== Extraer el audio de un video ======
+  avconv -i video.mp4 -vn -f mp3 audio.mp3
+Sistema antiguo mas lento que reproduce todo el vídeo:
 # mencoder video.avi -of rawaudio -oac mp3lame -ovc copy -o audio.mp3
@@ Line 30: / Line 34: @@
   avconv -i video.mp4 -vf transpose=1 out.mkv
+Vertical:
+  a="./Android/data/org.telegram.messenger/cache/4_49571627767169040.mp4"; ffmpeg -y -i $a -vf "hflip" out.mp4; mplayer out.mp4
+Otro:
+  a="./Android/data/org.telegram.messenger/cache/4_49571627767169052.mp4"; ffmpeg -y -i $a -vf "transpose=0" out.mp4; mplayer out.mp4
+Si ya está rotado, para dejarlo bien:
+  https://jgiere.de/how-to-rotate-a-video-with-avconv/
+  avconv -i rotated_video.mp4 -c:a copy video.mp4
+====== Concatenar Vídeo ======
+http://ffmpeg.org/faq.html#How-can-I-concatenate-video-files_003f
+<code>
+ffmpeg -i input1.avi -qscale:v 1 intermediate1.mpg
+ffmpeg -i input2.avi -qscale:v 1 intermediate2.mpg
+cat intermediate1.mpg intermediate2.mpg > intermediate_all.mpg
+ffmpeg -i intermediate_all.mpg -qscale:v 2 output.avi
+</code>
+====== Subir Volúmen a un vídeo ======
+Fuente: https://libav.org/avconv.html#volume
+  avconv -i video_volumen_flojo.mp4 -vcodec copy -af volume=2 outputfile.mp4