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• flv reencode to mp4 for iphone/ipod via ffmpeg and x264 (quality issue)

  3 octobre 2011, par zeroasterisk

  There are a lot of questions on this topic, and I've read most of them and most of the google search results I could come up with.

  When I use FFMPEG to convert a FLV to a iphone3 compatble MP4 file, it just doesn't preserver enough of the quality. Yes, I've worked the hell out of -sameq and -b and -bt settings, text just isn't readable.

  Next I tried to split the video out and process it directly, using these instructions :
  https://sites.google.com/site/linuxencoding/x264-encoding-guide

  The problem is myplayer (via ffmpeg) was not able to determine the duration of the FLV (even though the metadata was set).

  (I assume) Because of that unknown duration, when I create the MP4 file, the resulting x264 file plays through super-fast while the audio plays at the normal rate.

  user@server:/tmp# mplayer -nosound -benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'
  
  MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
  
  mplayer: could not connect to socket
  
  mplayer: No such file or directory
  
  Failed to open LIRC support. You will not be able to use your remote control.
  
  
  
  Playing input.flv.
  
  libavformat file format detected.
  
  [flv @ 0x1202460]Estimating duration from bitrate, this may be inaccurate
  
  [lavf] stream 0: video (vp6f), -vid 0
  
  [lavf] stream 1: audio (nellymoser), -aid 0
  
  VIDEO:  [VP6F]  1680x992  0bpp  1000.000 fps   33.4 kbps ( 4.1 kbyte/s)
  
  Clip info:
  
   audiocodecid: 6
  
   audiodatarate: 86
  
   audiosamplerate: 44100
  
   audiosamplesize: 16
  
   audiosize: 6097005
  
   canSeekToEnd: true
  
   datasize: 8609138
  
   duration: 567
  
   framerate: 2
  
   hasAudio: true
  
   hasCuePoints: false
  
   hasKeyframes: true
  
   hasMetadata: true
  
   hasVideo: true
  
   height: 992
  
   lasttimestamp: 567
  
   metadatacreator: flvtool++ (Facebook, Motion project, dweatherford)
  
   stereo: false
  
   totalframes: 1043
  
   videocodecid: 4
  
   videodatarate: 33
  
   videosize: 2316256
  
   width: 1680
  
  Using (default) progressive frame mode.Opening video filter: [expand w=640 h=480]
  
  Expand: 640 x 480, -1 ; -1, osd: 0, aspect: 0.000000, round: 1
  
  Opening video filter: [scale w=0 h=0]
  
  Opening video filter: [dsize=640:480:0]
  
  ==========================================================================
  
  Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
  
  Selected video codec: [ffvp6f] vfm: ffmpeg (FFmpeg VP6 Flash)
  
  ==========================================================================
  
  Audio: no sound
  
  Starting playback...
  
  Movie-Aspect is undefined - no prescaling applied.
  
  [swscaler @ 0x7f0c738b9620]Lanczos scaler, from yuv420p to yuv420p using MMX2
  
  VO: [yuv4mpeg] 640x480 => 641x480 Planar YV12

  I have also tried specifying FPS, but no change in results

  user@server:/tmp# mplayer -nosound -fps 25-benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --fps 25 --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'

  Can someone tell me how to either :

  1. fix my split A/V processing/timing/duration issues ?
  2. improve the
     quality of the FFMPEG conversion of FLV to iphone3 compatible
     format ?

• FFMPEG Convert from mov, mjpeg codec error

  30 août 2011, par vitel

  I've a problem when i try to convert a .mov to a .webm with ffmpeg... I've no problems from any others video format.

  I've enable the Quicktime formats "—enable-zlib" and with the "ffmpeg -formats" command i get .mov files as encode or decode.

  When i try to transform a video i get this :

    # ffmpeg -i /var/www/static/uploads/usersVideos/cavity0.mov -vcodec mjpeg  /var/www/static/uploads/usersVideos/cavity.webm
  
   ffmpeg version N-32159-gc70e852, Copyright (c) 2000-2011 the FFmpeg developers
  
   built on Aug 30 2011 14:16:07 with gcc 4.4.5
  
   configuration: --enable-gpl --enable-libmp3lame --enable-zlib --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab --enable-libvpx
  
     libavutil    51. 14. 0 / 51. 14. 0
  
     libavcodec   53. 12. 0 / 53. 12. 0
  
     libavformat  53. 10. 0 / 53. 10. 0
  
     libavdevice  53.  3. 0 / 53.  3. 0
  
     libavfilter   2. 37. 0 /  2. 37. 0
  
     libswscale    2.  0. 0 /  2.  0. 0
  
     libpostproc  51.  2. 0 / 51.  2. 0
  
   [mov,mp4,m4a,3gp,3g2,mj2 @ 0x13b7320] stream 0, error opening alias:     path='/matlab_sv13/work/cavity_flow/up500.jpg', dir='cavity_flow', filename='up500.jpg', volume='NONAME', nlvl_from=1, nlvl_to=1**
  
   [mov,mp4,m4a,3gp,3g2,mj2 @ 0x13b7320] Could not find codec parameters (Video: mjpeg (jpeg / 0x6765706A), 434x343, 4762 kb/s)
  
   /var/www/static/uploads/usersVideos/cavity0.mov: could not find codec parameters
  
   [1]    8265 exit 1     ffmpeg -i /var/www/static/uploads/usersVideos/cavity0.mov -vcodec mjpeg

  Someone has an idea ?

• Why ffmpeg command results in blank video ?

  17 juillet 2013, par kheya

  I am trying to conver mov file to H264 encoded mp4
  Same command converts another mov file just fine.

  But fails for a particular mov file. Original video is 29.6MB after conversion I get 966KB

  I get the sound and duration right. But all the frames are black even though original video is fine.

  Here is the command :

  ffmpeg -i file3.mov -movflags +faststart -vcodec libx264 -preset slow -crf 20 -vf -threads 0 -acodec libvo_aacenc -b:a 128k "file3.mp4"

  Here is the result of ffmpeg -i : >ffmpeg.exe -i file3.mov

  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 with gcc 4.7.3 (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-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000003077e0] sample aspect ratio already set to
  
  118:81, ignoring 'pasp' atom (10000:7031)
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
  
    Metadata:
  
      creation_time   : 2009-02-12 01:19:22
  
    Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
  
      Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
  
  64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
  
   tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
  
  6, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler

  During conversion here is what I see (nothing unusual or no errors) :

  ffmpeg version N-54691-g7f4a1fd Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Jul 12 2013 16:31:48 with gcc 4.7.3 (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-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 39.100 / 52. 39.100
  
    libavcodec     55. 18.102 / 55. 18.102
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 80.101 /  3. 80.101
  
    libswscale      2.  3.100 /  2.  3.100
  
    libswresample   0. 17.102 /  0. 17.102
  
    libpostproc    52.  3.100 / 52.  3.100
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000024aafe0] sample aspect ratio already set to
  
  118:81, ignoring 'pasp' atom (10000:7031)
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'file3.mov':
  
    Metadata:
  
      creation_time   : 2009-02-12 01:19:22
  
    Duration: 00:00:08.00, start: 0.000000, bitrate: 30338 kb/s
  
      Stream #0:0(eng): Video: dvvideo (dvpp / 0x70707664), yuv411p, 720x576 [SAR
  
  64:45 DAR 16:9], 28800 kb/s, SAR 118:81 DAR 295:162, 25 fps, 25 tbr, 600 tbn, 25
  
   tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s1
  
  6, 1536 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
  No pixel format specified, yuv422p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  [libx264 @ 0000000000347340] using SAR=118/81
  
  [libx264 @ 0000000000347340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  AVX
  
  [libx264 @ 0000000000347340] profile High 4:2:2, level 2.1, 4:2:2 8-bit
  
  [libx264 @ 0000000000347340] 264 - core 133 r2334 a3ac64b - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=5 deblock=1:0:0 analyse=0x3:0x113 me=umh subme=8 psy=1 psy_rd=1.00:0.00 mixed
  
  _ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pski
  
  p=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 deci
  
  mate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_
  
  adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=2
  
  5 scenecut=40 intra_refresh=0 rc_lookahead=50 rc=crf mbtree=1 crf=20.0 qcomp=0.6
  
  0 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'file4a.mp4':
  
    Metadata:
  
      encoder         : Lavf55.12.102
  
      Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv422p, 4
  
  80x320 [SAR 118:81 DAR 59:27], q=-1--1, 12800 tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
      Stream #0:1(eng): Audio: aac (libvo_aacenc) ([64][0][0][0] / 0x0040), 48000
  
  Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        creation_time   : 2009-02-12 01:19:22
  
        handler_name    : Apple Alias Data Handler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (dvvideo -> libx264)
  
    Stream #0:1 -> #0:1 (pcm_s16be -> libvo_aacenc)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 00000000024b0740] Warning: data is not aligned! This can lead to a s
  
  peedloss
  
  frame=   78 fps=0.0 q=25.0 size=     128kB time=00:00:02.14 bitrate= 487.8kbits/
  
  frame=  113 fps=109 q=25.0 size=     272kB time=00:00:04.27 bitrate= 520.9kbits/
  
  frame=  145 fps= 94 q=25.0 size=     399kB time=00:00:05.36 bitrate= 609.2kbits/
  
  frame=  182 fps= 89 q=25.0 size=     571kB time=00:00:06.45 bitrate= 725.0kbits/
  
  Starting second pass: moving header on top of the file
  
  frame=  200 fps= 70 q=-1.0 Lsize=     965kB time=00:00:08.00 bitrate= 987.2kbits
  
  /s
  
  video:832kB audio:126kB subtitle:0 global headers:0kB muxing overhead 0.755121%
  
  [libx264 @ 0000000000347340] frame I:1     Avg QP:21.14  size: 39885
  
  [libx264 @ 0000000000347340] frame P:50    Avg QP:21.80  size:  7412
  
  [libx264 @ 0000000000347340] frame B:149   Avg QP:26.25  size:  2960
  
  [libx264 @ 0000000000347340] consecutive B-frames:  0.5%  0.0%  1.5% 98.0%
  
  [libx264 @ 0000000000347340] mb I  I16..4: 13.7% 46.7% 39.7%
  
  [libx264 @ 0000000000347340] mb P  I16..4:  0.5% 19.7%  3.8%  P16..4: 32.8% 11.9
  
  % 14.1%  0.0%  0.0%    skip:17.1%
  
  [libx264 @ 0000000000347340] mb B  I16..4:  0.0%  5.1%  1.3%  B16..8: 14.4%  9.2
  
  %  2.9%  direct: 7.3%  skip:59.8%  L0:42.8% L1:38.3% BI:19.0%
  
  [libx264 @ 0000000000347340] 8x8 transform intra:79.4% inter:71.7%
  
  [libx264 @ 0000000000347340] direct mvs  spatial:97.3% temporal:2.7%
  
  [libx264 @ 0000000000347340] coded y,uvDC,uvAC intra: 92.8% 80.1% 26.3% inter: 2
  
  4.2% 28.8% 8.1%
  
  [libx264 @ 0000000000347340] i16 v,h,dc,p: 64% 17%  3% 16%
  
  [libx264 @ 0000000000347340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  1% 33%  4%  3%  8%
  
   2% 35%  2% 11%
  
  [libx264 @ 0000000000347340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu:  3% 23%  5%  4% 11%
  
   5% 33%  4% 13%
  
  [libx264 @ 0000000000347340] i8c dc,h,v,p: 38% 40% 14%  8%
  
  [libx264 @ 0000000000347340] Weighted P-Frames: Y:2.0% UV:0.0%
  
  [libx264 @ 0000000000347340] ref P L0: 39.9% 10.0% 25.6%  8.7% 15.3%  0.6%
  
  [libx264 @ 0000000000347340] ref B L0: 76.9% 15.1%  5.7%  2.3%
  
  [libx264 @ 0000000000347340] ref B L1: 96.3%  3.7%
  
  [libx264 @ 0000000000347340] kb/s:851.49