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  • How to add text to a video with ffmpeg and python

    25 janvier 2013, par Jared Glass

    I've been trying to add text to an avi with ffmpeg and I can't seem to get it right.

    Please help :

    import subprocess
    

    
ffmpeg = "C:\\ffmpeg_10_6_11.exe"
    
inVid = "C:\\test_in.avi"
    
outVid = "C:\\test_out.avi"
    

    
proc = subprocess.Popen(ffmpeg + " -i " + inVid + " -vf drawtext=fontfile='arial.ttf'|text='test' -y " + outVid , shell=True, stderr=subprocess.PIPE)
    
proc.wait()
    
print proc.stderr.read()

  • Best way to load in a video and to grab images using c++

    17 octobre 2011, par Seb

    I am looking for a fast way to load in a video file and to create images from them at certain intervals ( every second, every minute, every hour, etc.).

    I tried using DirectShow, but it just ran too slow for me to start the video file and move to a certain location to get data and to save it out to an image. Even if I disabled the reference clock. Tried OpenCV, but it has trouble opening the AVI file unless I know the exact codec information. So if I know a way to get the codec information out from OpenCV I may give it another shot. I tried to use FFMPEG, but I don't have as much control over it as well as I would wish.

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  • ffmpeg trying to remove the first few seconds of video

    21 octobre 2011, par zeroasterisk

    I'm trying to remove a few seconds off the front of a video stream (audio already excluded), and I'm getting strange results : I would think that for every second I increase -ss by, the resulting file would be a second shorter... that doesn't seem to be the case.

    original     ==> 01:04:52.84
    
-ss 19       ==> 01:04:42.84 (diff = 10) [command history shown below]
    
-ss 20       ==> 01:04:32.84 (diff = 20) [command history shown below]
    
-ss 21       ==> 01:04:32.84 (diff = 20)
    
-ss 25       ==> 01:04:32.84 (diff = 20)
    
-ss 0:0:25.0 ==> 01:04:32.84 (diff = 20)
    
-ss 0:0:25.5 ==> 01:04:32.84 (diff = 20) [command history shown below]

    Command : ffmpeg -ss # -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4

    Here's the command history for 19 & 20

    # ffmpeg -ss 19 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to 'temp_croppedFromStart.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=97071 fps=42523 q=-1.0 Lsize=  262684kB time=01:04:33.84 bitrate= 555.5kbits/s
    
video:261923kB audio:0kB global headers:0kB muxing overhead 0.290418%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:42.84, start: 0.000000, bitrate: 554 kb/s
    

    

    
# ffmpeg -ss 20 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to 'temp_croppedFromStart.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=96821 fps=47168 q=-1.0 Lsize=  262003kB time=01:04:32.84 bitrate= 554.2kbits/s
    
video:261244kB audio:0kB global headers:0kB muxing overhead 0.290410%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s
    

    
# ffmpeg -ss 0:0:25.5 -i temp.mp4 -y -vcodec copy  temp_croppedFromStart.mp4; ffmpeg -i temp.mp4 2>&1 | grep Duration; ffmpeg -i temp_croppedFromStart.mp4 2>&1 | grep Duration
    
ffmpeg version N-31809-g9acffed, Copyright (c) 2000-2011 the FFmpeg developers
    
  built on Aug 10 2011 21:25:11 with gcc 4.4.5
    
  configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-x11grab
    
  libavutil    51. 11. 1 / 51. 11. 1
    
  libavcodec   53. 10. 0 / 53. 10. 0
    
  libavformat  53.  6. 0 / 53.  6. 0
    
  libavdevice  53.  2. 0 / 53.  2. 0
    
  libavfilter   2. 28. 1 /  2. 28. 1
    
  libswscale    2.  0. 0 /  2.  0. 0
    
  libpostproc  51.  2. 0 / 51.  2. 0
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'temp.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
    Stream #0.0(und): Video: h264 (Constrained Baseline), yuv420p, 960x640, 552 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Output #0, mp4, to 'temp_croppedFromStart.mp4':
    
  Metadata:
    
    major_brand     : isom
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    creation_time   : 1970-01-01 00:00:00
    
    encoder         : Lavf53.6.0
    
    Stream #0.0(und): Video: libx264, yuv420p, 960x640, q=2-31, 552 kb/s, 25 tbn, 25 tbc
    
    Metadata:
    
      creation_time   : 1970-01-01 00:00:00
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
Press [q] to stop, [?] for help
    
frame=96821 fps=45920 q=-1.0 Lsize=  262003kB time=01:04:27.32 bitrate= 555.0kbits/s
    
video:261244kB audio:0kB global headers:0kB muxing overhead 0.290424%
    
  Duration: 01:04:52.84, start: 0.000000, bitrate: 553 kb/s
    
  Duration: 01:04:32.84, start: 0.000000, bitrate: 554 kb/s

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