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• Capture Android screen as a video file using FFmpeg

  6 mars 2013, par jacob

  I am trying to capture an Android device's screen as a video file using FFmpeg with this command :

  /data/local/ffmpeg -y -vcodec rawvideo -f rawvideo -pix_fmt rgb32 -s 320x480 -i /dev/graphics/fb0 /sdcard/output2.avi 2> /sdcard/out.txt

  This creates a file with a single (unclear) frame and stops.

  ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Sep 20 2012 13:28:38 with gcc 4.6.x-google 20120106 (prerelease)
  
    configuration: --arch=arm --cpu=cortex-a8 --target-os=linux --enable-runtime-cpudetect --prefix=/data/data/org.witness.sscvideoproto --enable-pic --disable-shared --enable-static --cross-prefix=/opt/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/arm-linux-androideabi- --sysroot=/opt/android-ndk/platforms/android-3/arch-arm --extra-cflags='-I../x264 -mfloat-abi=softfp -mfpu=neon' --extra-ldflags=-L../x264 --enable-version3 --enable-gpl --disable-doc --enable-yasm --enable-decoders --enable-encoders --enable-muxers --enable-demuxers --enable-parsers --enable-protocols --enable-filters --enable-avresample --enable-libfreetype --disable-indevs --enable-indev=lavfi --disable-outdevs --enable-hwaccels --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-network --enable-libx264 --enable-zlib
  
    libavutil      51. 54.100 / 51. 54.100
  
    libavcodec     54. 23.100 / 54. 23.100
  
    libavformat    54.  6.100 / 54.  6.100
  
    libavdevice    54.  0.100 / 54.  0.100
  
    libavfilter     2. 77.100 /  2. 77.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  [rawvideo @ 0xee5540] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, rawvideo, from '/dev/graphics/fb0':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 320x480, 25 tbr, 25 tbn, 25 tbc
  
  [buffer @ 0xef16e0] w:320 h:480 pixfmt:bgra tb:1/25 sar:0/1 sws_param:flags=2
  
  [buffersink @ 0xef1950] No opaque field provided
  
  [format @ 0xef1a70] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'format'
  
  [scale @ 0xef2c10] w:320 h:480 fmt:bgra sar:0/1 -> w:320 h:480 fmt:yuv420p sar:0/1 flags:0x4
  
  Output #0, avi, to '/sdcard/output2.avi':
  
    Metadata:
  
      ISFT            : Lavf54.6.100
  
      Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x480, q=2-31, 200 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
  
  Press [q] to stop, [?] for help
  
  frame=    5 fps=0.0 q=5.4 Lsize=     199kB time=00:00:00.20 bitrate=8156.6kbits/s    
  
  video:193kB audio:0kB global headers:0kB muxing overhead 2.929166%

  Any idea what am I doing wrong ?

• ffmpeg + ffserver : "Broken ffmpeg default settings detected"

  18 octobre 2012, par Chris Nolet

  I'm just trying to connect ffmpeg to ffserver and stream rawvideo.

  I keep getting the error : broken ffmpeg default settings detected from libx264 and then Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height from ffmpeg before it exits.

  I'm launching ffmpeg with the command : ffmpeg -f x11grab -s 320x480 -r 10 -i :0.0 -tune zerolatency http://localhost:8090/feed1.ffm

  My ffserver.conf file (for ffserver) looks like this :

  Port 8090
  
  BindAddress 0.0.0.0
  
  MaxHTTPConnections 2000
  
  MaxClients 1000
  
  MaxBandwidth 1000
  
  CustomLog -
  
  NoDaemon
  
  
  
  <feed>
  
    ACL allow 127.0.0.1
  
  </feed>
  
  
  
  <stream>
  
    Feed feed1.ffm
  
    Format asf
  
  
  
    NoAudio
  
  
  
    VideoBitRate 128
  
    VideoBufferSize 400
  
    VideoFrameRate 24
  
    VideoSize 320x480
  
  
  
    VideoGopSize 12
  
  
  
    VideoQMin 1
  
    VideoQMax 31
  
  
  
    VideoCodec libx264
  
  </stream>
  
  
  
  <stream>
  
    Format status
  
  </stream>

  And the full output is :

  ffmpeg version N-45614-g364c60b Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Oct 17 2012 04:34:04 with Apple clang version 4.1 (tags/Apple/clang-421.11.65) (based on LLVM 3.1svn)
  
    configuration: --enable-shared --enable-libx264 --enable-libmp3lame --enable-x11grab --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=/usr/bin/clang --host-cflags='-Os -w -pipe -march=native -Qunused-arguments -mmacosx-version-min=10.7' --extra-cflags='-x objective-c' --extra-ldflags='-framework Foundation -framework Cocoa -framework CoreServices -framework ApplicationServices -lobjc'
  
    libavutil      51. 76.100 / 51. 76.100
  
    libavcodec     54. 66.100 / 54. 66.100
  
    libavformat    54. 32.101 / 54. 32.101
  
    libavdevice    54.  3.100 / 54.  3.100
  
    libavfilter     3. 19.103 /  3. 19.103
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 16.100 /  0. 16.100
  
    libpostproc    52.  1.100 / 52.  1.100
  
  [x11grab @ 0x7f87dc01e200] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 320 height: 480
  
  [x11grab @ 0x7f87dc01e200] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, x11grab, from ':0.0':
  
    Duration: N/A, start: 1350517708.386699, bitrate: 49152 kb/s
  
      Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 320x480, 49152 kb/s, 10 tbr, 1000k tbn, 10 tbc
  
  [tcp @ 0x7f87dc804120] TCP connection to localhost:8090 failed: Connection refused
  
  [tcp @ 0x7f87dc804b20] TCP connection to localhost:8090 failed: Connection refused
  
  [libx264 @ 0x7f87dd801000] broken ffmpeg default settings detected
  
  [libx264 @ 0x7f87dd801000] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x7f87dd801000] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x7f87dd801000] speed presets are listed in x264 --help
  
  [libx264 @ 0x7f87dd801000] profile is optional; x264 defaults to high
  
  Output #0, ffm, to &#39;http://localhost:8090/feed1.ffm&#39;:
  
    Metadata:
  
      creation_time   : now
  
      Stream #0:0: Video: h264, yuv420p, 160x128, q=2-31, 128 kb/s, 1000k tbn, 10 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> libx264)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  Any help much appreciated :)

• calculate the real duration time of a broken movie with ffmpeg/ffprobe

  26 octobre 2012, par jAckOdE

  I have a broken video file that its ffprobe (ffprobe -i movie.mkv) say its duration is about 2 hours, but the file contains only video data for first 8minutes (check by VLC Player).

  How can i get the real duration (8minutes) using ffmpeg or ffprobe ?

  here is the output :

  ffprobe version 0.7.13, Copyright (c) 2007-2011 the FFmpeg developers
  
    built on Aug  1 2012 21:08:35 with clang 3.1 (tags/Apple/clang-318.0.58)
  
    configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libdirac --enable-libschroedinger --enable-libopenjpeg --enable-libvpx --enable-libspeex --disable-libopencore-amrnb --disable-libopencore-amrwb --mandir=/opt/local/share/man --enable-shared --enable-pthreads --cc=/usr/bin/clang --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc --enable-libx264 --enable-libxvid
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  [matroska,webm @ 0x7f93dc01e600] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, matroska,webm, from 'Mission.mkv':
  
    Duration: 02:12:56.21, start: 0.000000, bitrate: 448 kb/s
  
      Stream #0.0: Video: mpeg4, yuv420p, 1280x528 [PAR 1:1 DAR 80:33], 23.98 fps, 23.98 tbr, 1k tbn, 23.98 tbc (default)
  
      Stream #0.1: Audio: ac3, 48000 Hz, 5.1, s16, 448 kb/s (default)