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• How to escape spaces in windows cmd ?

  21 novembre 2017, par puppon -su

  Solved, look at Edit2.

  I’d like to make a .bat file that will call this command :

  ffplay -f lavfi "movie=loud.mp4:s=dv+da[vid][aud];[aud]asplit[aud][out1];[aud]showcqt=1280x720:volume=30:volume2=30,format=argb,colorchannelmixer=aa=0.8[out_v];[vid][out_v]overlay[out0]"

  I’m too lazy to type this every time. I need to replace loud.mp4 from the line above to a new file.

  cqt "System Shock Soundtrack - 00 - Intro-6CalFsdE4tA.mp4"

  I don’t understand how single and double quotes work, and how to escape spaces in file paths.

  Edit1 : I’m trying this :

  set arg1=%1
  
  
  
  ffplay -f lavfi "movie='%arg1%':s=dv+da[vid][aud];[aud]asplit[aud][out1];[aud]showcqt=1280x720:volume=30:volume2=30,format=argb,colorchannelmixer=aa=0.8[out_v];[vid][out_v]overlay[out0]"

  and call it like that :

  cqt "System Shock Soundtrack - 00 - Intro-6CalFsdE4tA.mp4"

  but it results in :

  Argument 'Shock' provided as input filename, but 'movie='System' was already specified.

  The command that really got executed is this. Notice the movie='"the movie file name.mp4"'

  ffplay -f lavfi "movie='"System Shock Soundtrack - 00 - Intro-6CalFsdE4tA.mp4"':s=dv+da[vid][aud];[aud]asplit[aud][out1];[aud]showcqt=1280x720:volume=30:volume2=30,format=argb,colorchannelmixer=aa=0.8[out_v];[vid][out_v]overlay[out0]"

  Edit2 : This worked, the amovie='%~1'

  ffplay -f lavfi "amovie='%~1'[aud];[aud]asplit[aud][out1];[aud]showcqt=1280x720:volume=30:volume2=30[out0]"

  and calling as :

  cqta "System Shock Soundtrack - 00 - Intro-6CalFsdE4tA.webm"

• create mp4 video for play online by ffmpeg widthout preload

  14 mai 2014, par Hamid Tanhaei

  i using ffmpeg to create a streamable mp4 video file for play online. but converted video try to load 3 - 4 MB data of video at start. then video can be play and seekable.

  i try to remove start load data by different ffmpeg commands. but each commands had problems.

  my first command(load 3-4 MB data of video at start and seekable) :

  ffmpeg -i file.mkv -movflags faststart -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 1.mp4

  and other commands(removed 3-4 MB load data at start and NOT seekable) :

  ffmpeg -i CloudywithaChanceofMeatballs.mkv -movflags faststart -frag_size 1024 -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 1.mp4
  
  ffmpeg -i DespicableMe2MiniMovie.mkv -movflags faststart -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4
  
  ffmpeg -i DespicableMe2MiniMovie.mkv -movflags faststart -frag_size 10240 -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4
  
  ffmpeg -i DespicableMe2MiniMovie.mkv -movflags faststart -frag_duration 2000 -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4
  
  ffmpeg -i CloudywithaChanceofMeatballs.mkv -movflags faststart -frag_duration 2000 -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4
  
  ffmpeg -i CloudywithaChanceofMeatballs.mkv -movflags frag_keyframe+empty_moov -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4
  
  ffmpeg -i CloudywithaChanceofMeatballs.mkv -g 52 -movflags frag_keyframe+empty_moov -s 500x268 -vf "movie=watermark.png [watermark]; [in][watermark] overlay=10:main_h-overlay_h-10 [out]" -b:v 100k -b:a 45k 2.mp4

  i used this command too(it load 3-4 MB data of video at start and seekable like first code by ffmpeg) :

  MP4Box -add video.mp4 videos.mp4
  
  MP4Box -inter 500 video.mp4

  my video file duration is : 1h 34min and converted size is 100MB

• Server side video mixing

  16 mars 2014, par Nicolas Goy

  I have a serie of video files encoded in mpeg2 (I can change this encoding), and I have to produce a movie in flash flv (this is a requirement, I can't change that encoding).

  One destination movie is a compilation of different source video files.

  I have a playlist defining the destination movie. For example :

  Video file        Position        Offset       Length 
  
  little_gnomes     0               0            8.5
  
  fairies           5.23            0.12         12.234
  
  pixies            14              0            9.2

  Video file is the name of the file, position is when the file should be started (in the master timeline), offset is the offset within the video file, and length is the length of the video to play. The numbers are seconds (in double).

  This would result in something like that (final movie timeline) :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   **************
  
  fairies               *********************
  
  pixies                           *****************

  Where video overlaps, the last video to be added override the last one, the audio should be mixed.

  The resulting video track would be :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   *******
  
  fairies               ***********
  
  pixies                           *****************

  While the resulting audio would be :

                 0--5.23|--8.5|--14|--17.464|--23.2|
  
  little_nomes   11111112222222
  
  fairies               222222211112222222222
  
  pixies                           22222222221111111

  Where 1 or 2 is the number of mixed audio tracks.

  There can be a maximum of 3 audio tracks.

  I need to write a program which takes the playlist as input and produce the flv file. I'm open to any solution (must be free/open source).

  An existing tool that can do that would be the simplest, but I found none. As for making my own solution, I found only ffmpeg, I was able to do basic things with it, but the documentation is terribly lacking.

  It can be any language, it doesn't have to be super fast (if it takes 30 minutes to build a 1h movie it's fine).

  The solution will run on opensolaris based x64 servers. If I have to use linux, this would work too. But windows is out of the question.