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• Loop a song for a certain amount of time using FFMPEG

  10 avril 2017, par Eduardo Perez

  So, I am trying to loop a song from a video game for one hour, using FFMPEG on Linux or in Windows 10 Bash. I have 3 versions of the song, they are as follows :

  1.Full song in OGG format with LOOPSTART and LOOPLENGTH metadata.
  
  2.Same song in OGG format, except only the segment before LOOPSTART.
  
  3.Same song in OGG format, except only the segment from LOOPSTART to LOOPSTART+LOOPLENGTH.

  So, what I want to do is use either the full song file for the loop, which I don’t think FFMPEG supports, or use the files for the beginning and looping portions of the song. Basically, I want to have FFMPEG create a song which starts off with the beginning segment of the song and loops the looping segment indefinitely until an hour has been played. If possible, I also want a second command so I can add an image or an MP4 video to be shown in a loop while the song is being played, but in the case of a video being used to be shown while the song is played, the music from that video won’t be merged with the music from the song. What command should I use for this ?

• Electron ffmpeg integration

  27 avril 2017, par Raider Dave

  I am in way over my head here. I am normally a coldfusion/javascript/jquery developer but now have taken on a task that assumes I know more than I do.

  I am trying to write an application in electron that will allow me to select a group of video files and convert them to mp4 files while also compressing them. The files are football plays and a normal game consists of about 160 plays and 18gb. We need to compress these down to about 4gb. I have used programs like Prism to do this, but the intended users are not technically savvy nor do they all have windows - some have Macs.

  I have an electron project that I have started and got the first part to work. I can start the app and select the input files. But I have tried all kinds of different solutions found online to call ffmpeg and pass it the parms to convert a file. Is there an easy way to call ffmpeg with parms and then wait for it to finish before continuing ?

  I am on Windows 10 but will also need to run on Apple OS. Please, if you have a simple example of how to do this, I would appreciate it.

  Thanks !
  Dave

• How to create a blank mp3 using ffmpeg ?

  11 mai 2017, par Vrushank Upadhyay

  I have built ffmpeg for android by using android NDK. I am using cocos game-engine to compile and run the project. I want to create a blank mp3 of lets say 20 seconds when a button is pressed. I have tried almost everything. The following command generates an output file but it is of 0 bytes.

  ffmpeg -f lavfi -i anullsrc=r=48000 -t 20 -codec copy /sdcard/output.mp3 

  My ffmpeg configuration is :

  > ./configure \
  
  >     --prefix=$PREFIX \
  
  >     --disable-network \
  
  >     --disable-doc \
  
  >     --disable-ffplay \
  
  >     --disable-ffprobe \
  
  >     --disable-ffserver \
  
  >     --disable-symver \
  
  >     --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  >     --target-os=linux \
  
  >     --arch=arm \
  
  >     --enable-cross-compile \
  
  >     --sysroot=$SYSROOT \
  
  >     --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
  >     --extra-ldflags="$ADDI_LDFLAGS" \

  Any help would be appreciated. I am testing this on an android phone. I have built static libraries for ffmpeg and they are linked to the project.