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• How to fix grainy recoding with ffmpeg mp4 x264 ?

  21 mars 2020, par teenserie

  I recorded the audio and video stream from a streaming with ffmpeg. when I go to re-encode the file using libx264, the video in the movements looks bad and grainy as in the image.
Where did I go wrong ?

  



  

  



  this is the code I used

  



  ffmpeg -i input.mp4 -c:v libx264 -c:a aac output.mp4


  



  and these are mediainfo of original file

  



      Metadata:
    major_brand     : isom
    minor_version   : 1
    compatible_brands: isom
    creation_time   : 2020-03-19T22:43:32.000000Z
  Duration: 00:39:51.99, start: 0.000000, bitrate: 1300 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x1080 [SAR 3:2 DAR 16:9], Closed Captions, 1268 kb/s, 59.94 fps, 59.94 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  mediainfo of the file recoded

  



   Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:39:51.99, start: 0.000000, bitrate: 7924 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], Closed Captions, 7892 kb/s, 59.94 fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(spa): Audio: aac (HE-AACv2) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 22 kb/s (default)
    Metadata:
      handler_name    : SoundHandler


  



  How can I recode the file without loss of quality ? (sorry for my poor english)

  


• avcodec/aacpsy : Avoid floating point division by 0 of norm_fac

  28 mai 2021, par Michael Niedermayer

  avcodec/aacpsy : Avoid floating point division by 0 of norm_fac
  Fixes : Ticket7995
  
  Fixes : CVE-2020-20446
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/aacpsy.c

• Looking for a general purpose way to merge audio and video file and make an output have stereo audio with FFmpeg

  21 février 2020, par Pineapple Joe

  So have have the following FFmpeg command

  ffmpeg -i vidab.mp4 -i recab.webm  -filter_complex "[0:a]volume=0.2,apad[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y mergeab.mp4

  When the input files are played separately their audio is played equally through both headphones.

  But after being merged the audio from the video is on the right side and the audio from the webm file is on the left side.

  I see this in the output when I run the cmd

  [Parsed_amerge_2 @ 0x7fa0faf01bc0] No channel layout for input 1
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels

  How can I adjust this so that the output file has the audio from both the inputs in equally in the left and right sides ?

  Also is there a generic way to do this such that even different configurations (video has stereo and audio has mono ... or both have stereo) result in the Audio being split evenly.

  I tried using the pan filter but there is something I am not understanding about how it works because either nothing happens or I flip left and right. But I am not getting even stereo.

  fwiw here is the full output.

  ffmpeg -i vidab.mp4 -i recab.webm  -filter_complex "[0:a]volume=0.2,apad[A];[1:a][A]amerge[Aout]" -map 0:v -map [Aout] -y mergeab.mp4
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple clang version 11.0.0 (clang-1100.0.33.8)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.1_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-13.jdk/Contents/Home/include/darwin -fno-stack-check' --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack
  
    libavutil      56. 31.100 / 56. 31.100
  
    libavcodec     58. 54.100 / 58. 54.100
  
    libavformat    58. 29.100 / 58. 29.100
  
    libavdevice    58.  8.100 / 58.  8.100
  
    libavfilter     7. 57.100 /  7. 57.100
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  5.100 /  5.  5.100
  
    libswresample   3.  5.100 /  3.  5.100
  
    libpostproc    55.  5.100 / 55.  5.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vidab.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      creation_time   : 2020-02-21T00:35:25.000000Z
  
    Duration: 00:00:10.65, start: 0.000000, bitrate: 2539 kb/s
  
      Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 96 kb/s (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Audio
  
      Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709), 1280x640, 2436 kb/s, 29.87 fps, 29.97 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : H.264
  
  Input #1, matroska,webm, from 'recab.webm':
  
    Metadata:
  
      encoder         : opus-media-recorder
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #1:0(eng): Audio: opus, 48000 Hz, mono, fltp (default)
  
  Stream mapping:
  
    Stream #0:0 (aac) -> volume (graph 0)
  
    Stream #1:0 (opus) -> amerge:in0 (graph 0)
  
    Stream #0:1 -> #0:0 (h264 (native) -> h264 (libx264))
  
    amerge (graph 0) -> Stream #0:1 (aac)
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fa0fb004000] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7fa0fb004000] profile High, level 3.1
  
  [libx264 @ 0x7fa0fb004000] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=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 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
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] No channel layout for input 1
  
  [Parsed_amerge_2 @ 0x7fa0faf01bc0] Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  Output #0, mp4, to 'mergeab.mp4':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 0
  
      compatible_brands: qt  
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuvj420p(pc, progressive), 1280x640, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
  
      Metadata:
  
        creation_time   : 2020-02-21T00:35:25.000000Z
  
        handler_name    : Core Media Video
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        encoder         : Lavc58.54.100 aac
  
  frame=  318 fps=107 q=-1.0 Lsize=    1568kB time=00:00:17.72 bitrate= 724.8kbits/s speed=5.99x    
  
  video:1282kB audio:272kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.902630%
  
  [libx264 @ 0x7fa0fb004000] frame I:2     Avg QP:19.72  size: 51154
  
  [libx264 @ 0x7fa0fb004000] frame P:148   Avg QP:21.28  size:  6644
  
  [libx264 @ 0x7fa0fb004000] frame B:168   Avg QP:25.18  size:  1351
  
  [libx264 @ 0x7fa0fb004000] consecutive B-frames:  1.3% 84.9%  0.0% 13.8%
  
  [libx264 @ 0x7fa0fb004000] mb I  I16..4: 23.2% 49.3% 27.5%
  
  [libx264 @ 0x7fa0fb004000] mb P  I16..4:  2.1%  2.0%  0.2%  P16..4: 29.0%  5.1%  4.8%  0.0%  0.0%    skip:56.8%
  
  [libx264 @ 0x7fa0fb004000] mb B  I16..4:  0.5%  0.3%  0.0%  B16..8: 16.7%  0.8%  0.2%  direct: 6.1%  skip:75.4%  L0:24.8% L1:71.1% BI: 4.1%
  
  [libx264 @ 0x7fa0fb004000] 8x8 transform intra:45.4% inter:74.3%
  
  [libx264 @ 0x7fa0fb004000] coded y,uvDC,uvAC intra: 29.3% 51.4% 11.6% inter: 5.7% 16.6% 0.3%
  
  [libx264 @ 0x7fa0fb004000] i16 v,h,dc,p: 11% 53% 10% 26%
  
  [libx264 @ 0x7fa0fb004000] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 36% 35%  2%  2%  2%  4%  2%  3%
  
  [libx264 @ 0x7fa0fb004000] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 30% 12%  4%  6%  5%  7%  5%  6%
  
  [libx264 @ 0x7fa0fb004000] i8c dc,h,v,p: 47% 33% 17%  4%
  
  [libx264 @ 0x7fa0fb004000] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7fa0fb004000] ref P L0: 76.6%  7.6% 11.1%  4.7%
  
  [libx264 @ 0x7fa0fb004000] ref B L0: 89.1% 10.3%  0.6%
  
  [libx264 @ 0x7fa0fb004000] ref B L1: 99.7%  0.3%
  
  [libx264 @ 0x7fa0fb004000] kb/s:989.60
  
  [aac @ 0x7fa0fb005800] Qavg: 13376.354