Newest 'libx264' Questions - Stack Overflow

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• Alternative to sws_scale

  19 décembre 2012, par Hrishikesh_Pardeshi

  I am performing encoding of the captured windows screen with x264 using libavcodec. Since, the input is RGB, i am converting it to YUV to make it compatible with x264. I am using the sws_scale function for the same. My question is if there is any alternate for this function since i don't need any scaling to be done in my case. Also, it would be useful if someone could throw light on the workflow of this function.

  P.S: I am assuming x264 operates only in YUV color space. If this assumption is incorrect, please inform me on the same.

  Thanks in advance.

• Converting avi to mp4 (use ffmpeg library) is very slow [closed]

  7 décembre 2012, par yAnTar

  I have task - convert any video from user to mp4 format. I use command

  ffmpeg -i $file -vcodec libx264 -vpre ultrafast -bt 500k -acodec libfaac -ab 56k -ac 2 -s 480x320 $outputFileMp4
  

  I try to change options bitrate, dimensions, but spped of converting is slow - 3 mbytes convert arround 90 seconds.

  If i convert avi to flv - no problem.

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
    built on Jan 29 2012 17:52:15 with gcc 4.4.5 20110214 (Red Hat 4.4.5-6)
    configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --incdir=/usr/include --disable-avisynth --extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --enable-avfilter --enable-avfilter-lavf --enable-libdc1394 --enable-libdirac --enable-libfaac --enable-libfaad --enable-libfaadbin --enable-libgsm --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libx264 --enable-gpl --enable-nonfree --enable-postproc --enable-pthreads --enable-shared --enable-swscale --enable-vdpau --enable-version3 --enable-x11grab
    libavutil     50.15. 1 / 50.15. 1
    libavcodec    52.72. 2 / 52.72. 2
    libavformat   52.64. 2 / 52.64. 2
    libavdevice   52. 2. 0 / 52. 2. 0
    libavfilter    1.19. 0 /  1.19. 0
    libswscale     0.11. 0 /  0.11. 0
    libpostproc   51. 2. 0 / 51. 2. 0
  Input #0, avi, from 'intro.avi':
    Duration: 00:07:48.53, start: 0.000000, bitrate: 244 kb/s
      Stream #0.0: Video: camtasia, bgr24, 800x600, 15 tbr, 15 tbn, 15 tbc
      Metadata:
        strn            : Camtasia Producer_render549ab1f.avi Video #1
      Stream #0.1: Audio: pcm_s16le, 12000 Hz, 1 channels, s16, 192 kb/s
      Metadata:
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  [libx264 @ 0x1202e40]using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
  [libx264 @ 0x1202e40]profile Constrained Baseline, level 2.2
  [libx264 @ 0x1202e40]264 - core 107 - H.264/MPEG-4 AVC codec - Copyleft 2003-2010 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0x1:0 me=dia subme=0 psy=1 psy_rd=0.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=200 ratetol=2.5 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.41 aq=0
  Output #0, mp4, to 'test2.mp4':
    Metadata:
      encoder         : Lavf52.64.2
      Stream #0.0: Video: libx264, yuv420p, 640x480, q=10-51, 200 kb/s, 15 tbn, 15 tbc
      Metadata:
        strn            : Camtasia Producer_render549ab1f.avi Video #1
      Stream #0.1: Audio: libfaac, 12000 Hz, 2 channels, s16, 5 kb/s
      Metadata:
        strn            : Microsoft Waveform: Camtasia Producer_render549ab1f.wav
  Stream mapping:
    Stream #0.0 -> #0.0
    Stream #0.1 -> #0.1
  

  and result of executing

  frame= 7028 fps= 52 q=10.0 Lsize=    2654kB time=468.31 bitrate=  46.4kbits/s
  video:1883kB audio:672kB global headers:0kB muxing overhead 3.876805%
  [libx264 @ 0xe1ee40]frame I:29    Avg QP:10.83  size: 25781
  [libx264 @ 0xe1ee40]frame P:6999  Avg QP:10.08  size:   169
  [libx264 @ 0xe1ee40]mb I  I16..4: 80.1%  0.0% 19.9%
  [libx264 @ 0xe1ee40]mb P  I16..4:  0.2%  0.0%  0.0%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:99.6%
  [libx264 @ 0xe1ee40]final ratefactor: 5.71
  [libx264 @ 0xe1ee40]coded y,uvDC,uvAC intra: 37.1% 3.3% 3.1% inter: 0.1% 0.0% 0.0%
  [libx264 @ 0xe1ee40]i16 v,h,dc,p: 87% 12%  1%  0%
  [libx264 @ 0xe1ee40]i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 23% 27%  8%  6%  3%  3%  2%  8%
  [libx264 @ 0xe1ee40]i8c dc,h,v,p: 94%  6%  0%  0%
  [libx264 @ 0xe1ee40]kb/s:32.91
  

• "Unknown encoder libx264" on Windows [migrated]

  29 novembre 2012, par shampoo

  I'm testing ClipBucket on a Windows XP system, and ClipBucket (open source video share) uses FFmpeg to convert videos. The final command it executes is (i changed it a little to make it compatible with the current FFmpeg):

  D:\ffmpeg-snapshot-git\ffmpeg\ffmpeg.exe -i C:
  \wamp\www\chclip/files/conversion_queue/1352973741c353c.mp4 -f flv -vcodec libx2
  64 -pre normal -r 25 -s 426x240 -aspect 1.775 -vf "pad=10:20:30:40:yellow"  -ac
  odec libfaac -ab 128000 -ar 22050 C:\wamp\www\chclip/files/videos/13540939451e18
  4.flv 2> C:\wamp\www\chclip/files/temp/13540939461c124.tmp 2>&1
  

  And this is the response I get:

  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 19 2012 16:42:42 with gcc 4.6.2 (GCC)
  configuration:
  libavutil      52.  8.100 / 52.  8.100
  libavcodec     54. 73.100 / 54. 73.100
  libavformat    54. 37.100 / 54. 37.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 23.101 /  3. 23.101
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp\www\chclip/files/conversion_que
  ue/1352973741c353c.mp4':
  Metadata:
  major_brand     : isom
  minor_version   : 512
  compatible_brands: isomiso2avc1mp41
  encoder         : Lavf53.21.0
  Duration: 00:00:51.67, start: 0.000000, bitrate: 344 kb/s
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 426x240 [
  SAR 1:1 DAR 71:40], 308 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
  Metadata:
  handler_name    : VideoHandler
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 31
  kb/s
  Metadata:
  handler_name    : SoundHandler
  Unknown encoder 'libx264'
  

  How can I get this libx264 working in Windows?

• unknown encoder libx264 windows

  28 novembre 2012, par shampoo

  i am testing clip bucket on a windows xp system , clip bucket (open source video share) uses ffmpeg to convert videos, the final command clip bucket executes is (i changed it a little to make it compatible with the current ffmpeg):

  D:\ffmpeg-snapshot-git\ffmpeg\ffmpeg.exe -i C:
  \wamp\www\chclip/files/conversion_queue/1352973741c353c.mp4 -f flv -vcodec libx2
  64 -pre normal -r 25 -s 426x240 -aspect 1.775 -vf "pad=10:20:30:40:yellow"  -ac
  odec libfaac -ab 128000 -ar 22050 C:\wamp\www\chclip/files/videos/13540939451e18
  4.flv 2> C:\wamp\www\chclip/files/temp/13540939461c124.tmp 2>&1
  

  and this is the response i get

  ffmpeg version 1.0.git Copyright (c) 2000-2012 the FFmpeg developers
  built on Nov 19 2012 16:42:42 with gcc 4.6.2 (GCC)
  configuration:
  libavutil      52.  8.100 / 52.  8.100
  libavcodec     54. 73.100 / 54. 73.100
  libavformat    54. 37.100 / 54. 37.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 23.101 /  3. 23.101
  libswscale      2.  1.102 /  2.  1.102
  libswresample   0. 16.100 /  0. 16.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C:\wamp\www\chclip/files/conversion_que
  ue/1352973741c353c.mp4':
  Metadata:
  major_brand     : isom
  minor_version   : 512
  compatible_brands: isomiso2avc1mp41
  encoder         : Lavf53.21.0
  Duration: 00:00:51.67, start: 0.000000, bitrate: 344 kb/s
  Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 426x240 [
  SAR 1:1 DAR 71:40], 308 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
  Metadata:
  handler_name    : VideoHandler
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 31
  kb/s
  Metadata:
  handler_name    : SoundHandler
  Unknown encoder 'libx264'
  

  how can i get this libx264 working in windows?

• Where ffmpeg flags like CODEC_FLAG2_BPYRAMID are located ?

  27 novembre 2012, par theateist

  I'm developing on using VS2010 with ffmpeg and tried the code from here. But VS says that it cannot find

  1. CODEC_FLAG2_BPYRAMID+CODEC_FLAG2_MIXED_REFS+CODEC_FLAG2_WPRED+CODEC_FLAG2_8X8DCT+CODEC_FLAG2_FASTPSKIP; // flags2=+bpyramid+mixed_refs+wpred+dct8x8+fastpskip
  2. X264_PART_I8X8+X264_PART_I4X4+X264_PART_P8X8+X264_PART_B8X8
  3. avCodecContext.crf

  Where are they located?