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• FFmpeg filtergraph for concatenate and amix doesn't work. Out of memory error

  16 janvier 2017, par Nadir

  I’m trying to concatenate two mp3 files, one after few seconds from the other with FFmpeg in an android application. I’m using this library

  To achieve this I’m creating an audio silence with aevalsrc and concatenate to this one the second input. After, with amix, I’m merging the result with the first input. This is the command :

  String[] cmd = {"-i", "/storage/emulated/0/input1.mp3", "-i", "/storage/emulated/0/input2.mp3", "-filter_complex", "aevalsrc=0:d=8[s1]; [s1][1:a]concat=n=2:a=1:v=0[a2]; [0:a][a2]amix=inputs=2:duration=longest", "-c:a", "libmp3lame",  "/storage/emulated/0/finito.mp3"};

  The output mp3 is created but it only contains the first input, like if it was just making a copy. The FFMpeg version is 3.0.1. The output shown is :

   I/ffmpeg(27265): [mp3 @ 0xb5bdf000] Skipping 0 bytes of junk at 4513.
  
   I/ffmpeg(27265): Input #0, mp3, from '/storage/emulated/0/input1.mp3':
  
   I/ffmpeg(27265):   Metadata:
  
   I/ffmpeg(27265):     track           : 0
  
   I/ffmpeg(27265):     TYER            : 0
  
   I/ffmpeg(27265):   Duration: 00:00:01.75, start: 0.000000, bitrate: 148 kb/s
  
   I/ffmpeg(27265):     Stream #0:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
   I/ffmpeg(27265): [mp3 @ 0xb5bdf600] Skipping 0 bytes of junk at 4513.
  
   I/ffmpeg(27265): Input #1, mp3, from '/storage/emulated/0/input2.mp3':
  
   I/ffmpeg(27265):   Metadata:
  
   I/ffmpeg(27265):     track           : 0
  
   I/ffmpeg(27265):     TYER            : 0
  
   I/ffmpeg(27265):   Duration: 00:00:00.37, start: 0.000000, bitrate: 226 kb/s
  
   I/ffmpeg(27265):     Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
  
   I/ffmpeg(27265): Output #0, mp3, to '/storage/emulated/0/finito.mp3':
  
   I/ffmpeg(27265):   Metadata:
  
   I/ffmpeg(27265):     TRCK            : 0
  
   I/ffmpeg(27265):     TYER            : 0
  
   I/ffmpeg(27265):     TSSE            : Lavf57.25.100
  
   I/ffmpeg(27265):     Stream #0:0: Audio: mp3 (libmp3lame), 44100 Hz, stereo, fltp (default)
  
   I/ffmpeg(27265):     Metadata:
  
   I/ffmpeg(27265):       encoder         : Lavc57.24.102 libmp3lame
  
   I/ffmpeg(27265): Stream mapping:
  
   I/ffmpeg(27265):   Stream #0:0 (mp3) -> amix:input0
  
   I/ffmpeg(27265):   Stream #1:0 (mp3) -> concat:in1:a0
  
   I/ffmpeg(27265):   amix -> Stream #0:0 (libmp3lame)
  
   I/ffmpeg(27265): Press [q] to stop, [?] for help
  
   I/ffmpeg(27265): size=      18kB time=00:00:01.09 bitrate= 133.0kbits/s speed=2.18x    
  
   I/ffmpeg(27265): Error while filtering: Out of memory
  
   I/ffmpeg(27265): size=      28kB time=00:00:01.75 bitrate= 131.1kbits/s speed=2.43x    
  
   I/ffmpeg(27265): video:0kB audio:28kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.999261%

• how to loop audio track ffmpeg when my audio duration is less than video video duration

  24 mars 2016, par dircco

  I’m using the follow command to generate a video from images :

  "ffmpeg - framerate 1/2 -i storage/emulated/0/myapp/temp/picutre%0d.png" +
  " -i /storage/emulated/0/myapp/music.mp3 -strict experimental -s " + getScreenResolution() + " -r 30 -vcodec mpeg4 -b
  150k -ab 48000 -ac 2 -ar 22050 -shortest " +
  filename ;

  My audio duration time is 30s and my total video duration time is 1min. There’s a way to loop my audio to complete my video duration ? I’m using a lib ffmpeg for android to generate a vídeo on my application.

• Unknown Decoder in ffmpeg

  17 mars 2020, par user6782547

  I have a script, that is called from Plex after the recording of a movie. This script just crops the black borders of the movie.

  When I call it directly from the command line, it works flawlessly. But when Plex calls it, it says : "Unknown decoder", even if I call it with the key word "auto" for the decoder.

  There’s another problem, that might give a hint to solve my problem. It also says : "WARNING: library configuration mismatch". (Only when being called from Plex.) This is probably, because I compile ffmpeg from the Debian source package (so that I can add the whole CUDA functionality).
  I had a look at the dynamic linker path, but it is empty on the command line.

  What is so different, when this command is called from Plex, than when I call it manually from the command line ?

  Thanks for any help