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• ffmpeg - when merging an image and audio, audio gets shortened

  25 août 2014, par Gary

  I am trying to merge a png image with 11 seconds of audio and create an mp4 file. When I execute ffmpeg I end up with a total duration of 10 seconds for the mp4 file. The command I’m using is...

  ffmpeg -r 6 -loop 1 -i "image1.png" -i "audio1.wav" out.mp4

  UPDATE : Here is the log that is produced...

  FFmpeg version SVN-r15986, Copyright (c) 2000-2008 Fabrice Bellard, et al.
  
    configuration: --extra-cflags=-fno-common --enable-memalign-hack --enable-pthr
  
    eads --enable-libmp3lame --enable-libxvid --enable-libvorbis --enable-libtheora
  
    --enable-libspeex --enable-libfaac --enable-libgsm --enable-libx264 --enable-lib
  
  schroedinger --enable-avisynth --enable-swscale --enable-gpl
  
        libavutil     49.12. 0 / 49.12. 0
  
        libavcodec    52. 6. 0 / 52. 6. 0
  
        libavformat   52.23. 1 / 52.23. 1
  
        libavdevice   52. 1. 0 / 52. 1. 0
  
        libswscale     0. 6. 1 /  0. 6. 1
  
        built on Dec  3 2008 01:59:37, gcc: 4.2.4
  
  Input #0, image2, from 'image1.png':
  
  Duration: 00:00:00.16, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: png, rgb32, 400x300,  6.00 tb(r)
  
  Input #1, wav, from 'audio1.wav':
  
    Duration: 00:00:11.07, bitrate: 88 kb/s
  
      Stream #1.0: Audio: pcm_u8, 11025 Hz, mono, s16, 88 kb/s
  
  File 'out.mp4' already exists. Overwrite ? [y/N] y
  
  Output #0, mp4, to 'out.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 400x300, q=2-31, 200 kb/s,  6.00 tb(c)
  
      Stream #0.1: Audio: libfaac, 11025 Hz, mono, s16, 64 kb/s
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
    Stream #1.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame=    1 fps=  0 q=4.1 Lsize=      42kB time=0.17 bitrate=2063.7kbits/s
  
  video:14kB audio:26kB global headers:0.kB muxing overhead 4.894235%

  I have also tried using

  ffmpeg -loop 1 -i "image1.png" -i "audio1.wav" -t 11 out.mp4

  This command does create an mp4 of 11 seconds but the audio is still cut off at 10 seconds.

  Why is the audio being cutoff at 10 seconds ?

  Thanks,
  Gary

• getting video file duration from adb shell

  2 août 2014, par Ganesh Sonthi

  I am writing some code using Ui Automator in Android which needs to play video files until END. For most of the files i am able to get the duration in Right bottom of the player and able to give Sleep duration as same of that.

  But for some of the files [mpg] the playback and total duration displaying as 0.00. VLC-Android and PC will be able to display the duration properly like 23seconds .. etc.. I already tried MediaMetaDataRetriever method as mentioned in How to get length in milliseconds of video from URL without video view in Android ? but here also i got ’0’ as duration.

  So, in this case i need some sort of solution which will be able to provide me some solution to get the duration of the file - Either by using adb shell or by passing some commands or some APK which can display duration and can be invoked by command line along with file URI.

  Can anyone please suggest some method.

• how to specify a seqence of image file to ffmpeg

  5 juillet 2014, par steveh

  i’m trying to encode a sequence of raw rgb image files in ffmpeg

  i have created a list of test files named lmfd001.rgb to lmfd299.rgb (300 total)

  i/m attempting to compress like this

  ffmpeg.exe -s 450x450 -pix_fmt rgb8 -c h264 -i lmfd%03d.rgb out.mp4

  it says

  lmfd%03d.rgb: No such file or directory

  i’m in a cygwin shell. i’m in the .rgb files directory.

  i also tried -i lmfd%03.rgb. i- lmfd001.rgb works but 1 file isn’t much use.

  i’ve googled around and that seems to be the right format. any ideas anyone ?

  i read this
  Warning : ffmpeg command line arguments are position sensitive – make sure you don’t mix up the order. Good rule of thumb to prevent mistakes is to keep the order of

  ffmpeg [input options] -i [input filename] -codec:v [video options] -codec:a [audio options] [output file options] [output filename]

  so i tried that too but didn ;t help