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• Extracting subclip from a .webm file with ffmpeg [migrated]

  19 juin 2013, par user815423426

  I am trying to extract a subclip from a webm file and write to an mp4 fil. I have the following command line :

  ffmpeg -ss 560 -i input.webm -ss 20 -t 46 -acodec copy -vcodec copy output.mp4

  but I get the following error :

  ffmpeg version 1.2 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Mar 22 2013 10:42:11 with gcc 4.7.2 (GCC)
  
    configuration: --prefix=/path/to/installations --enable-shared --enable-gpl --en
  
  able-nonfree --enable-version3 --enable-libx264                           
  
    libavutil      52. 18.100 / 52. 18.100
  
    libavcodec     54. 92.100 / 54. 92.100
  
    libavformat    54. 63.104 / 54. 63.104
  
    libavdevice    54.  3.103 / 54.  3.103
  
    libavfilter     3. 42.103 /  3. 42.103
  
    libswscale      2.  2.100 /  2.  2.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  2.100 / 52.  2.100
  
  Input #0, matroska,webm, from '/path/to/input.webm':                                          
  
    Duration: 01:13:20.32, start: 0.000000, bitrate: 2006 kb/s
  
      Stream #0:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 30 fp,
  
   30 tbr, 1k tbn, 1k tbc (default)                                         
  
      Stream #0:1(eng): Audio: vorbis, 44100 Hz, stereo, fltp (default)
  
  [mp4 @ 0x1493c340] track 0: could not find tag, codec not currently support
  
  ed in container                                                           
  
  Output #0, mp4, to '/path/to/output.mp4':                         
  
    Metadata:
  
      encoder         : Lavf54.63.104
  
      Stream #0:0(eng): Video: vp8, yuv420p, 640x480 [SAR 1:1 DAR 4:3], q=2-3
  
  1, 30 fps, 90k tbn, 1k tbc (default)                                      
  
      Stream #0:1(eng): Audio: vorbis ([221][0][0][0] / 0x00DD), 44100 Hz, st
  
  ereo (default)                                                            
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): O
  
  peration not permitted                                                    

  The strange thing is that the following works well for extracting files from mp4 to mp4

  ffmpeg -ss 560 -i input.mp4 -ss 20 -t 46 -acodec copy -vcodec copy output.mp4

• How should I add a transparent watermark.png over my RTMP h264 stream with ffmpeg ?

  16 juin 2013, par RoelandP

  I have a Raspberry Pi with the new camera module hooked up to (in this case) Bambuser. You can see the stream here, it's from a windmill in The Netherlands (camera position will be better within a few weeks).

  I succesfully have the stream running, but now I want to add an image (alpha transparent png) on top of the input-stream which is piped to ffmpeg to be streamed to Bambuser.

  I currently use the following command (user specific details wiped out) to succesfully stream the input from the Raspberry Camera module (it's great, HD & all, hardware rendering) to Bambuser, following the great tutorial by Slickstreamer :

  raspivid -t 999999999 -w 960 -h 540 -fps 25 -b 500000 -o - | ffmpeg  -i - -vcodec copy -an -metadata title="STREAM NAME" -f flv rtmp://USER_X.fme.bambuser.com/b-fme/USER_STREAM_KEY_X

  I followed the docs about ffmpeg and it seems to me I should use the '-vf'-command to apply the 'movies :' filter, like so :

  raspivid -t 999999999 -w 960 -h 540 -fps 25 -b 500000 -o - | ffmpeg  -i - -vf "movie='/home/USER/watermark.png' [logo]; [in][logo] overlay=main_w-overlay_w-10:10 [out]" -vcodec copy -an -metadata title="STREAM NAME" -f flv rtmp://USER_X.fme.bambuser.com/b-fme/USER_STREAM_KEY_X

  and various other -vf commands, like '-vf vflip' or '-vf mandelbrot'. But it doesn't seem to work, as the stream just shows the direct input from the Raspberry Camera.

  This is the output when started with the following -vf command :

  raspivid -t 999999999 -w 960 -h 540 -fps 25 -b 500000 -o - | ffmpeg -i - -vcodec copy -vf 'movie=0:png:/home/USER/watermark.png [watermark];[in] [watermark]overlay=0:0:1[out]' -an -metadata title="STREAM NAME" -f flv rtmp://USER_X.fme.bambuser.com/b-fme/USER_STREAM_KEY_X

  ffmpeg version N-54036-g6c4516d Copyright (c) 2000-2013 the FFmpeg developers
    built on Jun 15 2013 XX:XX with gcc 4.6 (Debian 4.6.3-14+rpi1)
    configuration : 
    libavutil      52. 35.101 / 52. 35.101
    libavcodec     55. 16.100 / 55. 16.100
    libavformat    55.  8.102 / 55.  8.102
    libavdevice    55.  2.100 / 55.  2.100
    libavfilter     3. 77.101 /  3. 77.101
    libswscale      2.  3.100 /  2.  3.100
    libswresample   0. 17.102 /  0. 17.102
  [h264 @ 0x1917cc0] max_analyze_duration 5000000 reached at 5000000 microseconds
  Input #0, h264, from 'pipe :' :
    Duration : N/A, bitrate : N/A
      Stream #0:0 : Video : h264 (High), yuv420p, 960x540, 25 fps, 25 tbr, 1200k tbn, 50 tbc
  Output #0, flv, to 'rtmp ://USER_X.fme.bambuser.com/b-fme/USER_STREAM_KEY_X' :
    Metadata :
      title : STREAM NAME
      encoder : Lavf55.8.102
      Stream #0:0 : Video : h264 ([7][0][0][0] / 0x0007), yuv420p, 960x540, q=2-31, 25 fps, 1k tbn, 1200k tbc
  Stream mapping :
    Stream #0:0 -> #0:0 (copy)
  frame= 2344 fps= 27 q=-1.0 size=    4827kB time=00:01:33.72 bitrate= 421.9kbits/s 
  

  As mentioned above, other -vf filters also don't seem to apply on the output stream on Bambuser, I think I fundamentally do something wrong here.

  1. Should I map the Raspivid-stream and map the image 'watermark.png' on top of that ? Would that be the solution ? Anyone experience with this ?

  Thank you very much for your thoughts in advance.

• ffmpeg php - shell_exec returns Permission Denied

  21 juin 2013, par Sotiris Akis Mitracos

  i'm integrating ffmpeg into my php webapp (on a windows server). Calling the library through shell_exec like this

  $out_shell = shell_exec("$ffmpeg myfile.avi 2>&1");

  i receive the following output :

    ffmpeg version N-54117-gf9739a3 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jun 19 2013 23:42:15 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --   enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 37.101 / 52. 37.101
  
    libavcodec     55. 16.100 / 55. 16.100
  
    libavformat    55.  9.100 / 55.  9.100
  
    libavdevice    55.  2.100 / 55.  2.100
  
    libavfilter     3. 77.101 /  3. 77.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  C:\ffmpeg: Permission denied

  what's wrong with the code ? if i run ffmpeg myfile.avi 2>&1 in cmd, I can also read video's meta-data.

  Could anybody help me ?
  thank you