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• FFMPEG : webm to mp4 quality loss

  11 février, par turboLoop

  When trying to convert a .webm video (two colored animation) to a .mp4 video using ffmpeg (3.4.2 on mac) the result is somewhat blurry. I did research this topic and tried different approaches to solve this. Here is the most promising command :

  



  ffmpeg -i vidoe.webm -qscale 1 video.mp4


  



  However, the quality change is still tremendous, see the difference below.

  



  webm

  



  

  



  mp4

  



  

  



  The resolution of the two videos is the same, however the size dropped from 24,3MB (.webm) to 1,5MB (.mp4) after conversion.

  



  Update

  



  Here is the log of the conversion.

  



  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, matroska,webm, from 'video.webm':
  Metadata:
    encoder         : whammy
  Duration: 00:00:05.02, start: 0.000000, bitrate: 38755 kb/s
    Stream #0:0: Video: vp8, yuv420p(progressive), 1920x1080, SAR 1:1 DAR 16:9, 60 fps, 60 tbr, 1k tbn, 1k tbc (default)
Please use -q:a or -q:v, -qscale is ambiguous
Stream mapping:
  Stream #0:0 -> #0:0 (vp8 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x7f8625800c00] -qscale is ignored, -crf is recommended.
[libx264 @ 0x7f8625800c00] using SAR=1/1
[libx264 @ 0x7f8625800c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x7f8625800c00] profile High, level 4.2
[libx264 @ 0x7f8625800c00] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 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_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 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 scenecut=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
Output #0, mp4, to 'video.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=  301 fps= 45 q=-1.0 Lsize=    1417kB time=00:00:04.96 bitrate=2336.4kbits/s speed=0.735x    
video:1412kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.309675%
[libx264 @ 0x7f8625800c00] frame I:2     Avg QP:13.08  size:  8842
[libx264 @ 0x7f8625800c00] frame P:75    Avg QP:24.29  size:  6785
[libx264 @ 0x7f8625800c00] frame B:224   Avg QP:26.38  size:  4102
[libx264 @ 0x7f8625800c00] consecutive B-frames:  0.7%  0.0%  1.0% 98.3%
[libx264 @ 0x7f8625800c00] mb I  I16..4: 68.1% 28.7%  3.2%
[libx264 @ 0x7f8625800c00] mb P  I16..4:  0.1%  2.2%  0.4%  P16..4:  6.5%  4.0%  1.4%  0.0%  0.0%    skip:85.4%
[libx264 @ 0x7f8625800c00] mb B  I16..4:  0.0%  0.2%  0.0%  B16..8:  8.8%  3.0%  0.3%  direct: 0.3%  skip:87.3%  L0:52.1% L1:47.5% BI: 0.4%
[libx264 @ 0x7f8625800c00] 8x8 transform intra:57.7% inter:67.8%
[libx264 @ 0x7f8625800c00] coded y,uvDC,uvAC intra: 25.7% 8.7% 0.9% inter: 3.9% 0.4% 0.0%
[libx264 @ 0x7f8625800c00] i16 v,h,dc,p: 95%  2%  3%  0%
[libx264 @ 0x7f8625800c00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 17%  5% 48%  5%  7%  6%  5%  4%  3%
[libx264 @ 0x7f8625800c00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 14% 31%  6%  7%  7%  6%  5%  4%
[libx264 @ 0x7f8625800c00] i8c dc,h,v,p: 88%  6%  6%  0%
[libx264 @ 0x7f8625800c00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x7f8625800c00] ref P L0: 55.3%  5.5% 24.8% 14.5%
[libx264 @ 0x7f8625800c00] ref B L0: 75.6% 16.7%  7.7%
[libx264 @ 0x7f8625800c00] ref B L1: 93.9%  6.1%
[libx264 @ 0x7f8625800c00] kb/s:2304.86


  



  Any idea on how to overcome this quality loss ?

  


• Converting mp4 file downloaded via youtube-dl from periscope by using ffmpeg gives error

  20 mars 2018, par MonsterMMORPG

  This is command i have used to download from periscope by using latest youtube-dl

  youtube-dl -v periscopeurl

  Then i am running this command to convert it to a proper MP4

  ffmpeg -i gg.mp4 -c:v libx264 -preset veryslow -crf 18 -c:a aac -b:a 192k -pix_fmt yuv420p gg2.mp4

  I am using latest youtube-dl and ffmpeg

  The error i am getting is shown below

  So how can i fix this error ? The file can not be played properly on k lite mega codec player but it can be played on vlc player however can not go to any specific time etc. so it really needs to be properly re-encoded

  C:\temp>ffmpeg -i gg.mp4 -c:v libx264 -preset veryslow -crf 18 -c:a aac -b:a 192k -pix_fmt yuv420p gg2.mp4
  
  ffmpeg version N-90378-ge4eaaf7bf6 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.3.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3l
  
  ame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-li
  
  bvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-l
  
  ibvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enabl
  
  e-avisynth
  
    libavutil      56. 11.100 / 56. 11.100
  
    libavcodec     58. 14.100 / 58. 14.100
  
    libavformat    58. 10.100 / 58. 10.100
  
    libavdevice    58.  2.100 / 58.  2.100
  
    libavfilter     7. 13.100 /  7. 13.100
  
    libswscale      5.  0.102 /  5.  0.102
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'gg.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.10.100
  
    Duration: 00:56:45.15, start: 0.000000, bitrate: 174 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x568, 130 kb/s, 23.97 fps, 24 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 35 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 00000009eda7ce00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 00000009eda7ce00] profile High, level 3.1
  
  [libx264 @ 00000009eda7ce00] 264 - core 155 r2901 7d0ff22 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me
  
  =umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 d
  
  ecimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=24 scenecut=40 intra_refresh=0 rc_look
  
  ahead=60 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Too many packets buffered for output stream 0:0.577014:32:22.77 bitrate=  -0.0kbits/s speed=N/A
  
  [libx264 @ 00000009eda7ce00] frame I:1     Avg QP:19.87  size: 30456
  
  [libx264 @ 00000009eda7ce00] frame P:36    Avg QP:19.68  size:  8765
  
  [libx264 @ 00000009eda7ce00] frame B:92    Avg QP:25.27  size:  1149
  
  [libx264 @ 00000009eda7ce00] consecutive B-frames:  0.8% 10.7%  0.0% 88.5%  0.0%  0.0%  0.0%  0.0%  0.0%
  
  [libx264 @ 00000009eda7ce00] mb I  I16..4:  8.3% 10.7% 81.0%
  
  [libx264 @ 00000009eda7ce00] mb P  I16..4:  0.9%  1.5%  1.0%  P16..4: 38.8% 16.4% 11.7%  3.1%  1.3%    skip:25.3%
  
  [libx264 @ 00000009eda7ce00] mb B  I16..4:  0.1%  0.1%  0.1%  B16..8: 21.5%  4.6%  2.1%  direct: 2.7%  skip:68.9%  L0:41.2% L1:45.6% BI:13.2%
  
  [libx264 @ 00000009eda7ce00] 8x8 transform intra:28.6% inter:10.9%
  
  [libx264 @ 00000009eda7ce00] direct mvs  spatial:93.5% temporal:6.5%
  
  [libx264 @ 00000009eda7ce00] coded y,uvDC,uvAC intra: 74.0% 65.1% 38.7% inter: 15.2% 8.0% 2.9%
  
  [libx264 @ 00000009eda7ce00] i16 v,h,dc,p: 49% 20% 23%  7%
  
  [libx264 @ 00000009eda7ce00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 12% 33%  3%  5%  5%  5%  5%  7%
  
  [libx264 @ 00000009eda7ce00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 21% 14% 10%  7%  9%  9% 11%  8% 11%
  
  [libx264 @ 00000009eda7ce00] i8c dc,h,v,p: 37% 24% 29% 10%
  
  [libx264 @ 00000009eda7ce00] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 00000009eda7ce00] ref P L0: 73.3%  6.3% 11.1%  1.8%  1.7%  1.2%  1.0%  0.5%  0.5%  0.4%  0.4%  0.4%  0.4%  0.4%  0.4%  0.3%
  
  [libx264 @ 00000009eda7ce00] ref B L0: 94.0%  3.8%  0.9%  0.3%  0.2%  0.2%  0.2%  0.1%  0.1%  0.1%  0.0%  0.0%  0.0%  0.0%  0.0%
  
  [libx264 @ 00000009eda7ce00] ref B L1: 97.7%  2.3%
  
  [libx264 @ 00000009eda7ce00] kb/s:672.35
  
  Conversion failed!
  
  
  
  C:\temp>

• ffmpeg Error converting multi channel WAV (13 channels) to AAC ?

  21 mars 2018, par AndySP

  I’m trying to convert a bunch of multi channel wavs that I have into multi channel AAC M4A’s to save space.

  FFMPEG is giving me an error which I don’t understand. Does any one have any ideas ?

  Here is the FFMPEG terminal dump including the command I’m trying to use, the source file is a 13 channel WAV that I exported using Cockos Reaper on the Mac.

  ffmpeg -i ACDC\ -\ Let\ There\ Be\ Rock.wav -c:a libfdk_aac -b:a 640k ACDC.m4a
  
  
  
  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.4.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-chromaprint --enable-ffplay --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-librsvg --enable-librtmp --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libssh --enable-libtesseract --enable-libvidstab --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-libzmq --enable-opencl --enable-videotoolbox --enable-openssl --enable-lzma --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-nonfree
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libavresample   3.  7.  0 /  3.  7.  0
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  Input #0, wav, from 'ACDC - Let There Be Rock.wav':
  
    Metadata:
  
      encoded_by      : REAPER
  
      date            : 2018-03-21
  
      creation_time   : 12-24-20
  
      time_reference  : 0
  
    Duration: 00:06:10.42, bitrate: 13759 kb/s
  
      Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 44100 Hz, 13 channels, s32 (24 bit), 13759 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s24le (native) -> aac (libfdk_aac))
  
  Press [q] to stop, [?] for help
  
  [auto_resampler_0 @ 0x7fad4d490b60] [SWR @ 0x7fad4e84a200] Rematrix is needed between 13 channels and 7.1(wide) but there is not enough information to do it
  
  [auto_resampler_0 @ 0x7fad4d490b60] Failed to configure output pad on auto_resampler_0
  
  Error reinitializing filters!
  
  Failed to inject frame into filter network: Invalid argument
  
  Error while processing the decoded data for stream #0:0
  
  Conversion failed!

  Any help greatly appreciated, cheers