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• Speed up start of a stream recording with ffmpeg

  15 janvier 2014, par neutron

  I try to record a video stream (from the web or a local webcam stream) and save it to a .mp4 / .flv file. I use FFmpeg with the version"N-59696-gc0a33c4".

  The problem isn't the recording of the stream, it is, how log it tooks to start the recording.

  This are the parameters i used to capture the stream (the stream is some random stream I found on the web) :

  ffmpeg.exe -i mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4

  And leads to this output :

  ffmpeg.exe -i mmsh://live.camstreams.com/cscams
  
  cape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4
  
  ffmpeg version N-59696-gc0a33c4 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan  8 2014 22:01:50 with gcc 4.8.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
  
  cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
  
  ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 62.100 / 52. 62.100
  
    libavcodec     55. 47.100 / 55. 47.100
  
    libavformat    55. 22.102 / 55. 22.102
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  0.103 /  4.  0.103
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
  
  Input #0, asf, from 'mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf':
  
    Metadata:
  
      title           : Live Fish Cam
  
      WMFSDKNeeded    : 0.0.0.0000
  
      DeviceConformanceTemplate: SP
  
      WMFSDKVersion   : 11.0.5721.5275
  
      IsVBR           : 0
  
    Duration: N/A, start: 3887858.274000, bitrate: 512 kb/s
  
      Stream #0:0(eng): Video: wmv3 (Simple) (WMV3 / 0x33564D57), yuv420p, 640x360
  
  , 512 kb/s, 62.50 tbr, 1k tbn, 1k tbc
  
  [libx264 @ 0275e400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0275e400] profile High, level 3.0
  
  [libx264 @ 0275e400] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Cop
  
  yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
  
  lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
  
  e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
  
  ma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1
  
  interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
  
   b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scene
  
  cut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin
  
  =0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  [wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
  
  Output #0, mp4, to 'C:\temp\video.mp4':
  
    Metadata:
  
      title           : Live Fish Cam
  
      WMFSDKNeeded    : 0.0.0.0000
  
      DeviceConformanceTemplate: SP
  
      WMFSDKVersion   : 11.0.5721.5275
  
      IsVBR           : 0
  
      encoder         : Lavf55.22.102
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
  
  40x360, q=-1--1, 12800 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (wmv3 -> libx264)
  
  Press [q] to stop, [?] for help
  
  frame=  148 fps=0.0 q=28.0 size=     228kB time=00:00:03.60 bitrate= 518.3kbits/
  
  frame=  151 fps=117 q=28.0 size=     236kB time=00:00:03.72 bitrate= 519.2kbits/
  
  frame=  178 fps= 91 q=28.0 size=     298kB time=00:00:04.80 bitrate= 508.3kbits/
  
  frame=  204 fps= 64 q=28.0 size=     347kB time=00:00:05.84 bitrate= 487.4kbits/
  
  ... 
  
  ... And so on ...

  The problem now is, that it takes around 6-10 seconds until the recording starts after I entered the command.

  Is there a way to speed up this process ?

• FFMPEG with SoX : configure : error : cannot find ffmpeg

  17 janvier 2014, par Alberto Megía

  So I am trying to install in my Ubuntu Desktop 12.04 SoX with FFMPEG support for m4a files.

  I have followed this instructions to install FFMPEG, installing only certain encoders. Finally, this is my set up :

  ffmpeg version git-2014-01-17-3ca7085 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jan 17 2014 12:36:01 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --prefix=~/ffmpeg_build --extra-cflags=-I~/ffmpeg_build/include --extra-ldflags=-L~/ffmpeg_build/lib --bindir=~/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-nonfree
  
    libavutil      52. 62.100 / 52. 62.100
  
    libavcodec     55. 48.101 / 55. 48.101
  
    libavformat    55. 23.103 / 55. 23.103
  
    libavdevice    55.  5.102 / 55.  5.102
  
    libavfilter     4.  1.100 /  4.  1.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Hyper fast Audio and Video encoder

  Then, I wget SoX 14.4.1 version and try to configure with FFMPEG support like this :

  ./configure --with-ffmpeg

  But I get this error :

  checking for FFMPEG... no
  
  checking libavformat/avformat.h usability... no
  
  checking libavformat/avformat.h presence... no
  
  checking for libavformat/avformat.h... no
  
  checking ffmpeg/avformat.h usability... no
  
  checking ffmpeg/avformat.h presence... no
  
  checking for ffmpeg/avformat.h... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  So I try to set PKG_CONFIG_PATH environment variable :

  PKG_CONFIG_PATH=~/ffmpeg_build/lib/pkgconfig
  
  ./configure --with-ffmpeg

  Getting :

  checking for FFMPEG... yes
  
  checking libavformat/avformat.h usability... yes
  
  checking libavformat/avformat.h presence... yes
  
  checking for libavformat/avformat.h... yes
  
  checking for av_open_input_file in -lavformat... no
  
  configure: error: in `~/sox-14.4.1':
  
  configure: error: cannot find ffmpeg
  
  See `config.log' for more details

  Checking 'config.log' I see the following error :

  | #define HAVE_LIBAVFORMAT_AVFORMAT_H 1
  
  | /* end confdefs.h.  */
  
  |
  
  | /* Override any GCC internal prototype to avoid an error.
  
  |    Use char because int might match the return type of a GCC
  
  |    builtin and then its argument prototype would still apply.  */
  
  | #ifdef __cplusplus
  
  | extern "C"
  
  | #endif
  
  | char av_open_input_file ();
  
  | int
  
  | main ()
  
  | {
  
  | return av_open_input_file ();
  
  |   ;
  
  |   return 0;
  
  | }
  
  configure:15862: result: no
  
  configure:15935: error: in `~/sox-14.4.1':
  
  configure:15937: error: cannot find ffmpeg

  What am I missing here ?
  Thx !

• What are some NPAPI video plugin alternatives for Chrome ?

  14 janvier 2014, par ElHaix

  Was : "PPAPI (Pepper) video plugin -NaCl module failed - how to resolve ?"

  Google's Say Goodbye to Our Old Friend NPAPI blog post indicates that NPAPI plugin support will cease by the end of 2014 (in favor of PPAPI).

  We have considered the option of using the ffmpeg libraries to create our own video plugin to simply decode RTSP encoded H.264 video streams on the client - important because we need as near real-time video display (avoiding transcoding latency). Using the ffmpeg libraries, there is still a 3-5 second delay in decoding the stream, not as fast as running MPlayer with the -benchmark option.

  In trying Google's PNaCl recommendation, we just got the LOADING status and the following error :

  NativeClient : NaCl module load failed : PnaclCoordinator : Compile
  process could not be created : ServiceRuntime : failed to start

  We don't need an encoder, simply decoding the incoming stream to images would be fine - or other suggestions ?

  What are some NPAPI alternatives to solve this problem ?