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• Converting mkv to mp4 with ffmpeg sometimes loses video

  9 décembre 2019, par RobertW

  How can I create a universal as possible command line to convert mkv to mp4 ?

  I fixed an issue where sometimes I’d lose audio (I think) and now I’m losing video.
  This is the command I currently use (I’ve used a few, including -analyzeduration 1G -probesize 50M but I always end up with broken videos at some point) :

  if [[ $(pgrep -i ffmpeg) ]] ; then
  
    echo "FFMPEG IS ALREADY RUNNING!"
  
  else 
  
    echo "Starting mkv to mp4 conversion...";
  
      for i in /var/www/html/uploads/Videos/*/*/*/*.mkv;
  
        do name=$(echo "${i//.mkv/}");
  
        echo "$name";
  
        ffmpeg -n -i "$i" -c copy -c:a aac -movflags +faststart "${name}.mp4"; rm -v -f "${name}.mkv";
  
      done
  
  fi

  Output of running that on the specific videos I’m losing picture on :

  Starting mkv to mp4 conversion...
  
  /var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (GCC)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
    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 '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p.mkv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:23:59.11, start: 0.000000, bitrate: 1258 kb/s
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080, 1124 kb/s, SAR 1:1 DAR 4:3, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (aac (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, mp4, to '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E02 - The Avatar Returns WEBDL-1080p.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080 [SAR 1:1 DAR 4:3], q=2-31, 1124 kb/s, 23.98 fps, 23.98 tbr, 16k tbn, 16k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc58.54.100 aac
  
  [mp4 @ 0x5583e9bdb8c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=34504 fps=1260 q=-1.0 Lsize=  221105kB time=00:23:59.08 bitrate=1258.6kbits/s speed=52.5x
  
  video:197477kB audio:22515kB subtitle:0kB other streams:0kB global headers:2kB muxing overhead: 0.506059%
  
  [aac @ 0x5583e9b3f140] Qavg: 562.538

  Edit :

  The below command worked on similar files which the above command did not :

    ffmpeg -n -i "$i" -c:v libx264 -c:a aac -movflags +faststart 

  Output :

  Starting mkv to mp4 conversion...
  
  /var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p
  
  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9 (GCC)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection' --extra-ldflags='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-frei0r --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libaom --enable-libdav1d --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-libjack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  
    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 '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mkv':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:24:10.74, start: 0.000000, bitrate: 1354 kb/s
  
      Stream #0:0(und): Video: hevc (Main 10) (hev1 / 0x31766568), yuv420p10le(tv), 1440x1080, 1124 kb/s, SAR 1:1 DAR 4:3, 23.98 fps, 23.98 tbr, 16k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: eac3 (ec-3 / 0x332D6365), 48000 Hz, stereo, fltp, 224 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Side data:
  
        audio service type: main
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (hevc (native) -> h264 (libx264))
  
    Stream #0:1 -> #0:1 (eac3 (native) -> aac (native))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x563ef7ad5a40] using SAR=1/1
  
  [libx264 @ 0x563ef7ad5a40] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  
  [libx264 @ 0x563ef7ad5a40] profile High 10, level 4.0, 4:2:0, 10-bit
  
  [libx264 @ 0x563ef7ad5a40] 264 - core 157 r2980 34c06d1 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - 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=34 lookahead_threads=5 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=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=81 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf58.29.100
  
      Stream #0:0(und): Video: h264 (libx264) (avc1 / 0x31637661), yuv420p10le, 1440x1080 [SAR 1:1 DAR 4:3], q=-1--1, 23.98 fps, 24k tbn, 23.98 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
        encoder         : Lavc58.54.100 aac
  
      Side data:
  
        audio service type: main
  
  frame=   37 fps=0.0 q=0.0 size=       0kB time=00:00:02.09 bitrate=   0.2kbits/sframe=   72 fps= 72 q=0.0 size=       0kB time=00:00:03.54 bitrate=   0.1kbits/sframe=  103 fps= 68 q=40.0 size=       0kB time=00:00:04.84 bitrate=   0.1kbits/frame=  128 fps= 64 q=40.0 size=       0kB time=00:00:05.90 bitrate=   0.1kbits/frame=  169 fps= 66 q=40.0 size=     256kB time=00:00:07.59 bitrate= 276.2kbits/frame=  194 fps= 63 q=40.0 size=     512kB time=00:00:08.66 bitrate= 484.3kbits/frame=  241 fps= 68 q=40.0 size=     512kB time=00:00:10.60 bitrate= 395.6kbits/frame=  262 fps= 64 q=40.0 size=     512kB time=00:00:11.47 bitrate= 365.5kbits/frame=  284 fps= 62 q=40.0 size=     768kB time=00:00:12.37 bitrate= 508.5kbits/frame=  312 fps= 61 q=40.0 size=     768kB time=00:00:13.54 bitrate= 464.5kbits/frame=  341 fps= 61 q=40.0 size=    1024kB time=00:00:14.74 bitrate= 569.1kbits/frame=  373 fps= 61 q=40.0 size=    1280kB time=00:00:16.10 bitrate= 651.0kbits/frame=  398 fps= 60 q=40.0 size=    1280kB time=00:00:17.13 bitrate= 612.1kbits/frame=  419 fps= 59 q=40.0 size=    1536kB time=00:00:18.02 bitrate= 698.0kbits/frame=  433 fps= 56 q=40.0 size=    1792kB time=00:00:18.60 bitrate= 789.2kbits/frame=  456 fps= 55 q=40.0 size=    2048kB time=00:00:19.56 bitrate= 857.6kbits/frame=  469 fps= 53 q=40.0 size=    2304kB time=00:00:20.11 bitrate= 938.2kbits/frame=  486 fps= 52 q=40.0 size=    2816kB time=00:00:20.82 bitrate=1108.0kbits/frame=  504 fps= 51 q=40.0 size=    3328kB time=00:00:21.58 bitrate=1262.8kbits/frame=  522 fps= 51 q=40.0 size=    4096kB time=00:00:22.31 bitrate=1503.7kbits/frame=  545 fps= 50 q=40.0 size=    4608kB time=00:00:23.27 bitrate=1621.9kbits/frame=  570 fps= 50 q=40.0 size=    5120kB time=00:00:24.34 bitrate=1723.1kbits/frame=  597 fps= 50 q=40.0 size=    5632kB time=00:00:25.45 bitrate=1812.8kbits/frame=  619 fps= 50 q=40.0 size=    5888kB time=00:00:26.38 bitrate=1827.8kbits/frame=  650 fps= 50 q=40.0 size=    6400kB time=00:00:27.66 bitrate=1894.8kbits/frame=  674 fps= 50 q=40.0 size=    6656kB time=00:00:28.65 bitrate=1903.1kbits/frame=  701 fps= 50 q=40.0 size=    6656kB time=00:00:29.78 bitrate=1830.9kbits/frame=  734 fps= 51 q=40.0 size=    6912kB time=00:00:31.12 bitrate=1819.2kbits/frame=  754 fps= 50 q=40.0 size=    7168kB time=00:00:31.97 bitrate=1836.2kbits/frame=  778 fps= 50 q=40.0 size=    7168kB time=00:00:33.00 --SNIPPED--
  
  bitrate=1518.4kbits/frame=34775 fps= 58 q=40.0 size=  268800kB time=00:24:10.64 bitrate=1518.0kbits/[mp4 @ 0x563ef7ad45c0] Starting second pass: moving the moov atom to the beginning of the file
  
  frame=34783 fps= 58 q=-1.0 Lsize=  269967kB time=00:24:10.68 bitrate=1524.5kbits/s speed= 2.4x
  
  video:246310kB audio:22689kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.359968%
  
  [libx264 @ 0x563ef7ad5a40] frame I:651   Avg QP:27.80  size: 60711
  
  [libx264 @ 0x563ef7ad5a40] frame P:10705 Avg QP:32.02  size: 14279
  
  [libx264 @ 0x563ef7ad5a40] frame B:23427 Avg QP:37.64  size:  2554
  
  [libx264 @ 0x563ef7ad5a40] consecutive B-frames:  6.9%  8.1%  5.5% 79.6%
  
  [libx264 @ 0x563ef7ad5a40] mb I  I16..4: 29.6% 60.8%  9.6%
  
  [libx264 @ 0x563ef7ad5a40] mb P  I16..4:  7.7% 10.0%  1.1%  P16..4: 20.4%  3.8%  2.2%  0.0%  0.0%    skip:54.8%
  
  [libx264 @ 0x563ef7ad5a40] mb B  I16..4:  0.6%  0.6%  0.1%  B16..8: 13.6%  1.0%  0.2%  direct: 0.7%  skip:83.3%  L0:41.6% L1:55.3% BI: 3.1%
  
  [libx264 @ 0x563ef7ad5a40] 8x8 transform intra:54.2% inter:75.7%
  
  [libx264 @ 0x563ef7ad5a40] coded y,uvDC,uvAC intra: 29.1% 50.3% 11.9% inter: 3.4% 4.5% 0.1%
  
  [libx264 @ 0x563ef7ad5a40] i16 v,h,dc,p: 25% 29%  9% 38%
  
  [libx264 @ 0x563ef7ad5a40] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 18% 25%  4%  5%  5%  5%  5%  5%
  
  [libx264 @ 0x563ef7ad5a40] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 27% 14% 17%  7%  8%  9%  6%  7%  4%
  
  [libx264 @ 0x563ef7ad5a40] i8c dc,h,v,p: 51% 22% 19%  9%
  
  [libx264 @ 0x563ef7ad5a40] Weighted P-Frames: Y:2.7% UV:2.1%
  
  [libx264 @ 0x563ef7ad5a40] ref P L0: 74.1% 16.9%  8.9%  0.1%
  
  [libx264 @ 0x563ef7ad5a40] ref B L0: 85.8% 11.6%  2.6%
  
  [libx264 @ 0x563ef7ad5a40] ref B L1: 96.8%  3.2%
  
  [libx264 @ 0x563ef7ad5a40] kb/s:1390.85
  
  [aac @ 0x563ef7ade100] Qavg: 572.905
  
  removed '/var/www/html/uploads/Videos/TV/Avatar The Last Airbender/Season 1/Avatar The Last Airbender - S01E03 - The Southern Air Temple WEBDL-1080p.mkv'
  
  Done transcoding!

• Getting small file size from ffmpeg [duplicate]

  20 février 2020, par sukach

  I am not an ffmpeg expert. I am trying to get some movies converted to a smaller DIVX file for a cheap portable DVD player for a family trip. The movies are for my kids so I’m not too concerned about quality.

  The DVD player is a 10.1", 1024x600 screen. It says it supports DIVX/MPEG2 files. It took me a lot of experimentation to get the right ffmpeg settings to even get it to work, but I found another answer that provided a very complex set of parameters that ultimately worked.

  I have converted about 20 movies with this setting and every one results in a file size of 1.1GB. I have tried different file sizes and crf settings and it is the same every time.

  Here is an example. First, the original file :

  General
  
  Complete name                            : Charlotte's Web.m4v
  
  Format                                   : MPEG-4
  
  Format profile                           : Base Media / Version 2
  
  Codec ID                                 : mp42 (isom/iso2/avc1/mp41)
  
  File size                                : 4.17 GiB
  
  Duration                                 : 1 h 36 min
  
  Overall bit rate mode                    : Variable
  
  Overall bit rate                         : 6 161 kb/s
  
  Movie name                               : Charlotte's Web
  
  Performer                                : Julia Roberts, Steve Buscemi, John Cleese, Oprah Winfrey, Cedric the Entertainer, Reba McEntire, Kathy Bates, Robert Redford, Thomas Haden Church, André Benjamin, Dominic Scott Kay, Sam Shepard, Abraham Benrubi, Dakota Fanning, Kevin Anderson, Essie Davis, Siobhan Fallon, Louis Corbett, Robyn Arthur, Julian O'Donnell, Gary Basaraba, Nate Mooney, Nicholas Bell, Beau Bridges, Teague Rook, Julia Zemiro, Denise Kirby, Robert Plazek, Joseph Lotesto, Michael Roland, Don Bridges, Ian Watkin, Joel McCrary, Brian Stepanek, Fred Tatasciore, Bradley White, Maia Kirkpatrick, Jennessa Rose, Briana Hodge, Dale Azzopardi, Geoff Burgess, Ella Scott Lynch, Greg Marian, Stefano Mazzeo, Elizabeth Saunders
  
  Director                                 : Gary Winick
  
  Actor                                    : Julia Roberts / Steve Buscemi / John Cleese / Oprah Winfrey / Cedric the Entertainer / Reba McEntire / Kathy Bates / Robert Redford / Thomas Haden Church / André Benjamin / Dominic Scott Kay / Sam Shepard / Abraham Benrubi / Dakota Fanning / Kevin Anderson / Essie Davis / Siobhan Fallon / Louis Corbett / Robyn Arthur / Julian O'Donnell / Gary Basaraba / Nate Mooney / Nicholas Bell / Beau Bridges / Teague Rook / Julia Zemiro / Denise Kirby / Robert Plazek / Joseph Lotesto / Michael Roland / Don Bridges / Ian Watkin / Joel McCrary / Brian Stepanek / Fred Tatasciore / Bradley White / Maia Kirkpatrick / Jennessa Rose / Briana Hodge / Dale Azzopardi / Geoff Burgess / Ella Scott Lynch / Greg Marian / Stefano Mazzeo / Elizabeth Saunders
  
  Screenplay by                            : Karey Kirkpatrick / Susannah Grant / Earl Hamner / Jr. / E.B. White
  
  Producer                                 : Julia Pistor / Jordan Kerner / Paul Neesan / Edgar M. Bronfman / Bernard Williams / Tony Winley
  
  Genre                                    : Comedy
  
  ContentType                              : Short Film
  
  Description                              : Wilbur the pig is scared of the end of the season, because he knows that come that time, he will end up on the dinner table. He hatches a plan with Charlotte, a spider that lives in his pen, to ensure that this will never happen.
  
  Recorded date                            : UTC 2006-12-15 11:00:00
  
  Encoded date                             : UTC 2017-01-23 02:37:54
  
  Tagged date                              : UTC 2017-01-24 01:19:52
  
  Writing application                      : HandBrake 1.0.1 2016122900
  
  Cover                                    : Yes
  
  LongDescription                          : Wilbur the pig is scared of the end of the season, because he knows that come that time, he will end up on the dinner table. He hatches a plan with Charlotte, a spider that lives in his pen, to ensure that this will never happen.
  
  ContentRating                            : mpaa|G|100|
  
  
  
  Video
  
  ID                                       : 1
  
  Format                                   : AVC
  
  Format/Info                              : Advanced Video Codec
  
  Format profile                           : High@L4
  
  Format settings                          : CABAC / 4 Ref Frames
  
  Format settings, CABAC                   : Yes
  
  Format settings, ReFrames                : 4 frames
  
  Codec ID                                 : avc1
  
  Codec ID/Info                            : Advanced Video Coding
  
  Duration                                 : 1 h 36 min
  
  Bit rate                                 : 5 691 kb/s
  
  Width                                    : 1 920 pixels
  
  Height                                   : 1 080 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate mode                          : Variable
  
  Frame rate                               : 23.976 (24000/1001) FPS
  
  Minimum frame rate                       : 23.974 FPS
  
  Maximum frame rate                       : 23.981 FPS
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Bits/(Pixel*Frame)                       : 0.114
  
  Stream size                              : 3.86 GiB (92%)
  
  Writing library                          : x264 core 148 r2708 86b7198
  
  Encoding settings                        : cabac=1 / ref=3 / deblock=1:-1:-1 / analyse=0x3:0x113 / me=hex / subme=7 / psy=1 / psy_rd=1.00:0.15 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=1 / chroma_qp_offset=-3 / 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=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=crf / mbtree=1 / crf=22.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=25000 / vbv_bufsize=31250 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:1.00
  
  Encoded date                             : UTC 2017-01-23 02:37:54
  
  Tagged date                              : UTC 2017-01-23 02:37:54
  
  Color range                              : Limited
  
  Color primaries                          : BT.709
  
  Transfer characteristics                 : BT.709
  
  Matrix coefficients                      : BT.709
  
  Menus                                    : 4

  Here is the first encode settings :

  ffmpeg -i "$1" -sn -c:a libmp3lame -ar 48000 -ab 128k -ac 2 -c:v mpeg4 -crf 24 -vtag DIVX -vf scale=1024x600:force_original_aspect_ratio=decrease -mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 30 -vb 1500k "$2"

  And the resulting mediainfo :

  General
  
  Complete name                            : Charlotte's Web (2006) - DIVX.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  Format profile                           : OpenDML
  
  File size                                : 1.11 GiB
  
  Duration                                 : 1 h 36 min
  
  Overall bit rate                         : 1 644 kb/s
  
  Movie name                               : Charlotte's Web
  
  Director                                 : Julia Roberts, Steve Buscemi, John Cleese, Oprah Winfrey, Cedric the Entertainer, Reba McEntire, Kathy Bates, Robert Redford, Thomas Haden Church, André Benjamin, Dominic Scott Kay, Sam Shepard, Abraham Benrubi, Dakota Fanning, Kevin Anderson, Essie Davis, Siobhan Fallon, Louis Corbett, Robyn Arthur, Julian O'Donnell, Gary Basaraba, Nate Mooney, Nicholas Bell, Beau Bridges, Teague Rook, Julia Zemiro, Denise Kirby, Robert Plazek, Joseph Lotesto, Michael Roland, Don Bridges, Ian Watkin, Joel McCrary, Brian Stepanek, Fred Tatasciore, Bradley White, Maia Kirkpatrick, Jennessa Rose, Briana Hodge, Dale Azzopardi, Geoff Burgess, Ella Scott Lynch, Greg Marian, Stefano Mazzeo, Elizabeth Saunders
  
  Genre                                    : Comedy
  
  Recorded date                            : UTC 2006-12-15 11:00:00
  
  Writing application                      : Lavf57.56.100
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : MPEG-4 Visual
  
  Format profile                           : Simple@L1
  
  Format settings, BVOP                    : No
  
  Format settings, QPel                    : No
  
  Format settings, GMC                     : No warppoints
  
  Format settings, Matrix                  : Default (H.263)
  
  Codec ID                                 : DIVX
  
  Codec ID/Info                            : Project Mayo
  
  Codec ID/Hint                            : DivX 4
  
  Duration                                 : 1 h 36 min
  
  Bit rate                                 : 1 500 kb/s
  
  Width                                    : 1 024 pixels
  
  Height                                   : 576 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate                               : 23.976 (24000/1001) FPS
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 0.106
  
  Stream size                              : 1.02 GiB (91%)
  
  Writing library                          : Lavc57.64.100

  Here was my attempt at a smaller file size (lower crf and smaller scale setting) :

  ffmpeg -i "Charlotte's Web.m4v" -sn -c:a libmp3lame -ar 48000 -ab 128k -ac 2 -c:v mpeg4 -crf 30 -vtag DIVX -vf scale=800:480 -mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -g 30 -vb 1500k "Charlotte's Web (2006) - DIVX 2.avi" 

  And the resulting mediainfo :

  General
  
  Complete name                            : Charlotte's Web (2006) - DIVX 2.avi
  
  Format                                   : AVI
  
  Format/Info                              : Audio Video Interleave
  
  Format profile                           : OpenDML
  
  File size                                : 1.11 GiB
  
  Duration                                 : 1 h 36 min
  
  Overall bit rate                         : 1 643 kb/s
  
  Movie name                               : Charlotte's Web
  
  Director                                 : Julia Roberts, Steve Buscemi, John Cleese, Oprah Winfrey, Cedric the Entertainer, Reba McEntire, Kathy Bates, Robert Redford, Thomas Haden Church, André Benjamin, Dominic Scott Kay, Sam Shepard, Abraham Benrubi, Dakota Fanning, Kevin Anderson, Essie Davis, Siobhan Fallon, Louis Corbett, Robyn Arthur, Julian O'Donnell, Gary Basaraba, Nate Mooney, Nicholas Bell, Beau Bridges, Teague Rook, Julia Zemiro, Denise Kirby, Robert Plazek, Joseph Lotesto, Michael Roland, Don Bridges, Ian Watkin, Joel McCrary, Brian Stepanek, Fred Tatasciore, Bradley White, Maia Kirkpatrick, Jennessa Rose, Briana Hodge, Dale Azzopardi, Geoff Burgess, Ella Scott Lynch, Greg Marian, Stefano Mazzeo, Elizabeth Saunders
  
  Genre                                    : Comedy
  
  Recorded date                            : UTC 2006-12-15 11:00:00
  
  Writing application                      : Lavf57.56.100
  
  
  
  Video
  
  ID                                       : 0
  
  Format                                   : MPEG-4 Visual
  
  Format profile                           : Simple@L1
  
  Format settings, BVOP                    : No
  
  Format settings, QPel                    : No
  
  Format settings, GMC                     : No warppoints
  
  Format settings, Matrix                  : Default (H.263)
  
  Codec ID                                 : DIVX
  
  Codec ID/Info                            : Project Mayo
  
  Codec ID/Hint                            : DivX 4
  
  Duration                                 : 1 h 36 min
  
  Bit rate                                 : 1 499 kb/s
  
  Width                                    : 800 pixels
  
  Height                                   : 480 pixels
  
  Display aspect ratio                     : 16:9
  
  Frame rate                               : 23.976 (24000/1001) FPS
  
  Color space                              : YUV
  
  Chroma subsampling                       : 4:2:0
  
  Bit depth                                : 8 bits
  
  Scan type                                : Progressive
  
  Compression mode                         : Lossy
  
  Bits/(Pixel*Frame)                       : 0.163
  
  Stream size                              : 1.02 GiB (91%)
  
  Writing library                          : Lavc57.64.100

  Same file size but lower resolution.

  Any ideas on what the best settings to achieve my goal ?

• 2011 In Open Source Multimedia

  5 janvier 2012, par Multimedia Mike — Open Source Multimedia

  Sometimes I think that the pace of multimedia technology is slowing down. Obviously, I’m not paying close enough attention. I thought I would do a little 2011 year-end review of what happened in the world of open source multimedia, mainly for my own benefit. Let me know in the comments what I missed.

  The Split
  The biggest deal in open source multimedia was the matter of the project split. Where once stood one project (FFmpeg) there now stands two (also Libav). Where do things stand with the projects now ? Still very separate but similar. Both projects obsessively monitor each other’s git commits and prodigiously poach each other’s work, both projects being LGPL and all. Most features that land in one code base end up in the other. Thus, I refer to FFmpeg and Libav collectively as “the projects”.

  Some philosophical reasons for the split included project stagnation and development process friction. Curiously, these problems are fond memories now and the spirit of competition has pushed development forward at a blinding pace.

  People inside the project have strong opinions about the split ; that’s understandable. People outside the project have strong opinions about the split ; that’s somewhat less understandable, but whatever. After 5 years of working for Adobe on the Flash Player (a.k.a. the most hated software in all existence if internet nerds are to be believed on the matter), I’m so over internet nerd drama.

  For my part, I just try to maintain some appearance of neutrality since I manage some shared resources for the open source multimedia community (like the wiki and samples repo) and am trying to keep them from fracturing as well.

  Apple and Open Source
  It was big news that Apple magnanimously open sourced their lossless audio codec. That sets a great example and precedent.

  New Features
  I mined the 'git log' of the projects in order to pick out some features that were added during 2011.

  First off, Apple’s ProRes video codec was reverse engineered and incorporated into the multimedia libraries. And for some weird reason, this is an item that made the rounds in the geek press. I’m not entirely sure why, but it may have something to do with inter-project conflict. Anyway, here is the decoder in action, playing a video of some wild swine, one of the few samples we have :

  
  
  

  Other new video codecs included a reverse engineered Indeo 4 decoder. Gotta catch ‘em all ! That completes our collection of Indeo codecs. But that wasn’t enough– this year, we got a completely revised Indeo 3 decoder (the previous one, while functional, exhibited a lot of code artifacts betraying a direct ASM ->C translation). Oh, and many thanks to Kostya for this gem :

  
  
  

  That’s the new Origin Xan decoder (best known for Wing Commander IV cinematics) in action, something I first started reverse engineering back in 2002. Thanks to Kostya for picking up my slack yet again.

  Continuing with the codec section, there is a decoder for Adobe Flash Screen Video 2 — big congrats on this ! One of my jobs at Adobe was documenting this format to the outside world and I was afraid I could never quite make it clear enough to build a complete re-implementation. But the team came through.

  Let’s see, there are decoders for VBLE video, Ut Video, Windows Media Image (WMVP/WMP2), Bink audio version ‘b’, H.264 4:2:2 intra frames, and MxPEG video. There is a DPX image encoder, a Cirrus Logic AccuPak video encoder, and a v410 codec.

  How about some more game stuff ? The projects saw — at long last — an SMJPEG demuxer. This will finally allow usage and testing of the SMJPEG IMA ADPCM audio decoder I added about a decade ago. Funny story behind that– I was porting all of my decoders from xine which included the SMJPEG ADPCM. I just never quite got around to writing a corresponding demuxer. Thanks to Paul Mahol for taking care of that.

  Here’s a DFA playback system for a 1995 DOS CD-ROM title called Chronomaster. No format is too obscure, nor its encoded contents too cheesy :

  
  
  

  There’s now a demuxer for a format called XMV that was (is ?) prevalent on Xbox titles. Now the projects can handle FMV files from many Xbox games, such as Thrillville.

  
  
  

  The projects also gained the ability to play BMV files. I think this surfing wizard comes from Discworld II. It’s non-computer-generated animation at a strange resolution.

  
  
  

  More demuxers : xWMA, PlayStation Portable PMP format, and CRI ADX format ; muxer for OpenMG audio and LATM muxer/demuxer.

  One more thing : an AVX-optimized fast Fourier transform (FFT). If you have a machine that supports AVX, there’s no way you’ll even notice the speed increase of a few measly FFT calls for audio coding/decoding, but that’s hardly the point. The projects always use everything on offer for any CPU.

  Please make me aware of features that I missed in the list !

  Continuous Testing
  As a result of the split, each project has its own FATE server, one for FFmpeg and one for Libav. As of the new year, FFmpeg has just over 1000 tests while Libav had 965. This is one area where I’m obviously ecstatic to see competition. Some ad-hoc measurements on my part indicate that the total code coverage via the FATEs has not appreciably increased. But that’s a total percentage. Both the test count and the code count have been steadily rising.

  Google Summer of Code and Google Code-In
  Once again, the projects were allowed to participate in the Google Summer of Code as well as Google Code-In. I confess that I didn’t keep up with these too carefully (and Code-In is still in progress as of this writing). I do know that the project split occurred after FFmpeg had already been accepted for GSoC season 2011 and the admins were gracious enough to allow FFmpeg and Libav to allow both projects to participate in the same slot as long as they could both be mature about it.

  Happy New Year
  Let’s see what we can accomplish in 2012.