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• Why does FFMPEG always make large WebM files ?

  2 avril 2013, par Student of Hogwarts

  I'm trying to encode my movies into WebM :

  ffmpeg -i input.MOV -codec:v libvpx -quality good -cpu-used 0 -b:v 10k
  
  -qmin 10 -qmax 42 -maxrate 10k -bufsize 20k -threads 8 -vf scale=-1:1080
  
  -codec:a libvorbis -b:a 192k
  
  output.webm

  I want to encode at a couple of different bit rates (video and audio combined) :

  • 2192 kbps
  • 1692 kbps
  • 1000 kbps

  The problem is that no matter which bit rates I enter, I always get a file with a bit rate higher than 1900 kbps. (1914 kbps with the code example above.)

  What am I doing wrong ?

• ffmpeg on fb0 from Nexus Galaxy error : "could not get frame filename number 2"

  3 mars 2012, par user848106

  I use ffmpeg to convert fb0 files from Androids and produce screenshots. For some reason this does not work with the Nexus Galaxy.

  I get this error :

  [image2 @ 0000000001E0E350] Could not get frame filename number 2 from pattern '
  
  image.png'
  
  av_interleaved_write_frame(): Invalid argument

  Here is the process :

      C:\dev\scripts>adb pull /dev/graphics/fb0
  
  3292 KB/s (16777216 bytes in 4.976s)
  
  
  
  C:\dev\scripts>ffmpeg -vframes 1 -vcodec rawvideo -f rawvideo -pix
  
  _fmt rgb32 -s 720x1080 -i fb0 -f image2 -vcodec png image.png
  
  ffmpeg version N-36635-gceb0dd9 Copyright (c) 2000-2012 the FFmpeg developers
  
    built on Jan  9 2012 17:45:55 with gcc 4.6.2
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
  
  ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
  
  able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
  
  c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil      51. 34.100 / 51. 34.100
  
    libavcodec     53. 54.100 / 53. 54.100
  
    libavformat    53. 29.100 / 53. 29.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 58.100 /  2. 58.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
    libpostproc    51.  2.100 / 51.  2.100
  
  [rawvideo @ 000000000037D5A0] Estimating duration from bitrate, this may be inac
  
  curate
  
  Input #0, rawvideo, from 'fb0':
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 720x1080, 25 tbr, 25
  
   tbn, 25 tbc
  
  [buffer @ 000000000037D420] w:720 h:1080 pixfmt:bgra tb:1/1000000 sar:0/1 sws_pa
  
  ram:
  
  Output #0, image2, to 'image.png':
  
    Metadata:
  
      encoder         : Lavf53.29.100
  
      Stream #0:0: Video: png, bgra, 720x1080, q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo -> png)
  
  Press [q] to stop, [?] for help
  
  [image2 @ 0000000001E0E350] Could not get frame filename number 2 from pattern '
  
  image.png'
  
  av_interleaved_write_frame(): Invalid argument

• Conversion for WebM file format using FFMPEG

  23 mars 2012, par user974435

  I am using followng command to convert video to webm format

  ffmpeg -i video/ds2.mp4 -acodec libvorbis -ac 2 -ab 96k -ar 44100 -b:a 345k -s 640x360 video/ds2.webm

  I am receiving following errors :

  1) incompatible sample format 's16' for codec 'libvorbis'

  2) strptime() unavailable on this system, cannot convert the data string

  Do you any idea why I cannot convert, tested conversion to FLV and it's working very well

  Console output

  C:\inetpub\wwwroot>ffmpeg -i video/testavi.avi video/ds2.webm
  
  ffmpeg version N-35709-g7d531e8, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Dec 12 2011 13:56:52 with gcc 4.6.2
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
  
  ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
  
  able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
  
  c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 43. 0 / 53. 43. 0
  
    libavformat  53. 24. 0 / 53. 24. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 53. 0 /  2. 53. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, avi, from 'video/testavi.avi':
  
    Metadata:
  
      encoder         : Lavf51.12.1
  
    Duration: 00:00:13.03, start: 0.000000, bitrate: 36427 kb/s
  
      Stream #0:0: Video: msmpeg4 (MP43 / 0x3334504D), yuv420p, 1920x1080, 30 tbr,
  
   30 tbn, 30 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16, 192 kb
  
  /s
  
  File 'video/ds2.webm' already exists. Overwrite ? [y/N] y
  
  w:1920 h:1080 pixfmt:yuv420p tb:1/1000000 sar:0/1 sws_param:
  
  [libvpx @ 0000000001CA9BB0] v0.9.7-p1
  
  Output #0, webm, to 'video/ds2.webm':
  
    Metadata:
  
      encoder         : Lavf53.24.0
  
      Stream #0:0: Video: vp8, yuv420p, 1920x1080, q=-1--1, 200 kb/s, 1k tbn, 30 t
  
  bc
  
      Stream #0:1: Audio: vorbis, 44100 Hz, stereo, s16, 128 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (msmpeg4 -> libvpx)
  
    Stream #0:1 -> #0:1 (mp3 -> libvorbis)
  
  Press [q] to stop, [?] for help

  ---

  Problem signature:
  
    Problem Event Name:   APPCRASH
  
    Application Name: ffmpeg.exe
  
    Application Version:  0.0.0.0
  
    Application Timestamp:    4ee64f02
  
    Fault Module Name:    ffmpeg.exe
  
    Fault Module Version: 0.0.0.0
  
    Fault Module Timestamp:   4ee64f02
  
    Exception Code:   c0000005
  
    Exception Offset: 000000000091e090
  
    OS Version:   6.1.7601.2.1.0.272.7
  
    Locale ID:    1033
  
    Additional Information 1: ab8f
  
    Additional Information 2: ab8f35a907f8f11a8d2e787a8e40efbd
  
    Additional Information 3: f4d5
  
    Additional Information 4: f4d524f8bf76a4b71cc6a7afa6412ca9
  
  
  
  Read our privacy statement online:
  
    http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409
  
  
  
  If the online privacy statement is not available, please read our privacy statement offline:
  
    C:\Windows\system32\en-US\erofflps.txt

  And Console Uncut Output

  C:\inetpub\wwwroot>ffmpeg.exe -i "video/testavi.avi" -acodec libvorbis -b:a 96k
  
  -ac 2 -vcodec libvpx -b:v 400k -f webm -s 384x216 "video/testavi.webm"
  
  ffmpeg version N-35709-g7d531e8, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Dec 12 2011 13:56:52 with gcc 4.6.2
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-ru
  
  ntime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libope
  
  ncore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --en
  
  able-libmp3lame --enable-libopenjpeg --enable-librtmp --enable-libschroedinger -
  
  -enable-libspeex --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwben
  
  c --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-
  
  libxvid --enable-zlib
  
    libavutil    51. 32. 0 / 51. 32. 0
  
    libavcodec   53. 43. 0 / 53. 43. 0
  
    libavformat  53. 24. 0 / 53. 24. 0
  
    libavdevice  53.  4. 0 / 53.  4. 0
  
    libavfilter   2. 53. 0 /  2. 53. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, avi, from 'video/testavi.avi':
  
    Metadata:
  
      encoder         : Lavf51.12.1
  
    Duration: 00:00:13.03, start: 0.000000, bitrate: 36427 kb/s
  
      Stream #0:0: Video: msmpeg4 (MP43 / 0x3334504D), yuv420p, 1920x1080, 30 tbr,
  
   30 tbn, 30 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz, stereo, s16, 192 kb
  
  /s
  
  [buffer @ 0000000001D7FF60] w:1920 h:1080 pixfmt:yuv420p tb:1/1000000 sar:0/1 sw
  
  s_param:
  
  [scale @ 0000000001D7E9E0] w:1920 h:1080 fmt:yuv420p -> w:384 h:216 fmt:yuv420p
  
  flags:0x4
  
  [libvpx @ 0000000001BF7C10] v0.9.7-p1
  
  Output #0, webm, to 'video/testavi.webm':
  
    Metadata:
  
      encoder         : Lavf53.24.0
  
      Stream #0:0: Video: vp8, yuv420p, 384x216, q=-1--1, 400 kb/s, 1k tbn, 30 tbc
  
  
  
      Stream #0:1: Audio: vorbis, 44100 Hz, 2 channels, s16, 96 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (msmpeg4 -> libvpx)
  
    Stream #0:1 -> #0:1 (mp3 -> libvorbis)
  
  Press [q] to stop, [?] for help