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• Convert flv to mp4 using ffmpeg

  24 janvier 2014, par Ram

  I'd like to convert flv file to mp4 file which is sent through RTMP protocol to Wowza server. The flv file details are..

  video codec - Sorenson Spark
  
  Audio codec - Nellymoser 16khz

  I'm currently using the following code is as follows...

  ProcessBuilder processBuilder = new ProcessBuilder(ffmpegApp, "-i", filenameIn,
  
                  "-ar", "22050", filenameOut);

  When I start process buider I'm getting following error info...

  FFmpeg version SVN-r23607, Copyright (c) 2000-2010 the FFmpeg developers
  
  built on Jun 15 2010 04:09:35 with gcc 4.4.2
  
  configuration: --target-os=mingw32 --enable-runtime-cpudetect --enable-avisynth --enable-gpl --enable-version3 --enable-bzlib --enable-libgsm --enable-libfaad --enable-pthreads --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libmp3lame --enable-libopenjpeg --enable-libxvid --enable-libschroedinger --enable-libx264 --extra-libs='-lx264 -lpthread' --enable-libopencore_amrwb --enable-libopencore_amrnb --enable-librtmp --extra-libs='-lrtmp -lpolarssl -lws2_32 -lwinmm' --arch=x86 --cross-prefix=i686-mingw32- --cc='ccache i686-mingw32-gcc' --enable-memalign-hack
  
  
  
  
  
  libavutil     50.19. 0 / 50.19. 0
  
  libavcodec    52.76. 0 / 52.76. 0
  
  libavformat   52.68. 0 / 52.68. 0
  
  libavdevice   52. 2. 0 / 52. 2. 0
  
  libavfilter    1.20. 0 /  1.20. 0
  
  libswscale     0.11. 0 /  0.11. 0
  
  [flv @ 01a0d0a0]Unsupported audio codec (4)
  
  Last message repeated 54 times
  
  [flv @ 01a0d0a0]Could not find codec parameters (Audio: [4][0][0][0] / 0x0004, 5512Hz,   1 channels)
  
  [flv @ 01a0d0a0]Estimating duration from bitrate, this may be inaccurate
  
  Input #0, flv, from 'C:\Program Files (x86)\Wowza Media Systems\Wowza Media Server         3.6.2\content\iStream.flv':
  
   Metadata:
  
   duration        : 11
  
   creationdate    : Tue Aug 13 13:21:15
  
   Duration: 00:00:11.19, start: 0.000000, bitrate: N/A
  
  Stream #0.0: Video: flv, yuv420p, 192x144, 1k tbr, 1k tbn, 1k tbc
  
  Stream #0.1: Audio: [4][0][0][0] / 0x0004, 5512 Hz, 1 channels

• ffmpeg : videos before and after conversion aren't the same length

  16 juillet 2012, par Koyot

  I have a set of .mov videos which require conversion to .mp4 format. I'm using ffmpeg and running this command :

  ffmpeg -i Banking.mov -vsync -async -sameq -ac 1 -ab 64k -ar 44100 Banking.mp4

  There is a slight difference between input and output video in time length (00:03:35.407 and 00:03:35.582). And here's the catch - I'm storing time cue set at precise times in a file which is used by a program to point at specific scenes. The 0.1 second difference causes it to point at wrong scenes, therefore making the cue set useless. Is there any possibility to preserve exactly the same time in different format ?

     FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice BellardMac OSX universal build for ffmpegX
  
    configuration:  --enable-memalign-hack --enable-mp3lame --enable-gpl --disable-vhook --disable-ffplay --disable-ffserver --enable-a52 --enable-xvid --enable-faac --enable-faad --enable-amr_nb --enable-amr_wb --enable-pthreads --enable-x264 
  
    libavutil version: 49.0.0
  
    libavcodec version: 51.9.0
  
    libavformat version: 50.4.0
  
    built on Apr 15 2006 04:58:19, gcc: 4.0.1 (Apple Computer, Inc. build 5250)
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x5597b8]negative ctts, ignoring
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Banking.mov':
  
    Duration: 00:03:35.6, start: 0.000000, bitrate: 1400 kb/s
  
    Stream #0.0(eng): Audio: pcm_s16be, 24000 Hz, stereo, 768 kb/s
  
    Stream #0.1(eng), 29.97 fps(r): Video: h264, yuv420p, 720x480
  
  Output #0, mp4, to 'Banking.mp4':
  
    Stream #0.0, 29.97 fps(c): Video: mpeg4, yuv420p, 720x480, q=2-31, 200 kb/s
  
    Stream #0.1: Audio: aac, 44100 Hz, mono, 64 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop encoding
  
  frame= 6461 q=0.0 Lsize=   53181kB time=215.3 bitrate=2023.3kbits/s    
  
  video:51437kB audio:1618kB global headers:0kB muxing overhead 0.237816%

• FFmpeg .jpg images to .mp4 incompatible with Windows Media Player

  8 janvier 2020, par willspill

  I have a series of 10 images with which I am trying to form an animation. I have used the following code below in the command line :

  ffmpeg -f image2 -i plot-%03d.jpg -r 5 -pix_fmt yuv420p -vcodec mpeg4 output.mp4

  This creates a .mp4 file with a seemingly valid file size, however, when trying to open with Windows Media Player gives the following error :

  Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.

  I have tried many solutions from previous threads but have found no solution. I have checked that my version of windows media player is compatible with mp4, avi, wmv etc. and have tried all of these outputs also. Any ideas of the issue ?

  The full code :

  M:Example\Frames_plot-001_jpg>ffmpeg -f image2 -i plot-%03
  
  ix_fmt yuv420p -vcodec mpeg4 output.mp4
  
  FFmpeg version SVN-r11200, Copyright (c) 2000-2007 Fabrice Bellard,
  
    configuration: --enable-memalign-hack
  
    libavutil version: 49.5.0
  
    libavcodec version: 51.48.0
  
    libavformat version: 52.1.0
  
    built on Dec 11 2007 14:33:27, gcc: 3.4.5 (mingw special)
  
  Input #0, image2, from 'plot-%03d.jpg':
  
    Duration: 00:00:00.4, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 4167x4167 [PAR 120:120 DAR
  
  tb(r)
  
  Output #0, mp4, to 'output.mp4':
  
      Stream #0.0: Video: mpeg4, yuv420p, 4167x4167 [PAR 1:1 DAR 1:1]
  
   kb/s,  5.00 tb(c)
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press [q] to stop encoding
  
  Compiler did not align stack variables. Libavcodec has been miscomp
  
  and may be very slow or crash. This is not a bug in libavcodec,
  
  but in the compiler. You may try recompiling using gcc >= 4.2.
  
  Do not report crashes to FFmpeg developers.
  
  frame=    3 fps=  3 q=4.0 Lsize=     917kB time=0.6 bitrate=12522.6
  
  video:916kB audio:0kB global headers:0kB muxing overhead 0.072455%