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• Convert PNGs to webm video with transparency

  20 septembre 2016, par sebastian

  I would like to use avconv to convert a series of PNG images to a WebM video, preserving transparency.

  I understand that the pixel format used in the output video must support transparency. So I tried :

  $ avconv -framerate 25 -f image2 -i frames/%03d.png -pix_fmt yuva420p output.webm

  Unfortunately, avconv complains :

  Incompatible pixel format 'yuva420p' for codec 'libvpx-vp9', auto-selecting format 'yuv420p'

  I am using ffmpeg version 2.8.4-1+b1 Copyright (c) 2000-2015 the FFmpeg developers.

• ffmpeg usage to encode a video to H264 codec format

  20 août 2015, par goldenmean

  I have a *.mp4 video file(MPEG4 video codec) and I am trying to convert this to a H264 video codec format(raw h.264 format) using ffmpeg on Linux(Version - FFmpeg version SVN-r0.5.1-4:0.5.1-1ubuntu1, Copyright (c) 2000-2009 Fabrice Bellard,) using command line as shown below,

  ffmpeg -i input .mp4 output.h264 

  but I get an error saying -

  Unsupported codec for output stream #0.0

  Then when i try this option :

  ffmpeg -i input .mp4 -formats h264 output.h264 

  it still does not work, and gives -

  Seems stream 0 codec frame rate differs from container frame rate: 59.94 (5994/100) -> 29.97 (30000/1001)
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Rapture.mp4':
  
    Duration: 00:02:06.44, start: 0.000000, bitrate: 26574 kb/s
  
      Stream #0.0(eng): Video: h264, yuv420p, 1920x1080, 29.97 tbr, 29.97 tbn, 59.94 tbc
  
      Stream #0.1(eng): Audio: aac, 48000 Hz, stereo, s16

  And then it prints out help on the formats which we get when we do ffmpeg -formats

  When I checked the help, ffmpeg -formats, I see below information related to H264 file format and codec :

  File format : 
  
  
  
  DE h264            raw H.264 video format
  
  
  
  Codecs:
  
  
  
  D V D  h264         H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10

  My questions :

  1. How can I convert the video to a H264 encoded video (raw H264 video format)

  2. When I do ffmpeg -formats, I see many acronyms for the codecs supported, I see many acronyms before the codec name/type such as - D V D S E A, what do they stand for ?

  3. How to use the ffmpeg options -vcodec and -formats ?

• FFmpeg - mapping 4 audio channels to 1 audio track

  18 juillet 2016, par Avalon

  I have two QT MOV’s that I want to concatenate using FFmpeg, but I am having trouble understanding how to map the audio channels.

  First MOV has 2 channels, Front Left and Front Right. Second MOV has 4 channels, Front Left, Front Right, Side Left and Side Right.

  How do I create 1 audio track with 4 channels mapped as FL, FR, SL and SR ?

  MediaInfo reports the following (not desired result) :

  Audio #1
  
  ID                                       : 2
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 4mn 35s
  
  Bit rate mode                            : Variable
  
  Bit rate                                 : 126 Kbps
  
  Maximum bit rate                         : 160 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 4 channels
  
  Channel positions                        : Front: L C R, Side: C
  
  Sampling rate                            : 48.0 KHz
  
  Frame rate                               : 46.875 fps (1024 spf)
  
  Compression mode                         : Lossy
  
  Stream size                              : 4.14 MiB (12%)
  
  Default                                  : Yes
  
  Alternate group                          : 1
  
  
  
  Audio #2
  
  ID                                       : 3
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 4mn 35s
  
  Bit rate mode                            : Variable
  
  Bit rate                                 : 127 Kbps
  
  Maximum bit rate                         : 160 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 4 channels
  
  Channel positions                        : Front: L C R, Side: C
  
  Sampling rate                            : 48.0 KHz
  
  Frame rate                               : 46.875 fps (1024 spf)
  
  Compression mode                         : Lossy
  
  Stream size                              : 4.18 MiB (12%)
  
  Default                                  : No
  
  Alternate group                          : 1
  
  
  
  Audio #3
  
  ID                                       : 4
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 4mn 35s
  
  Bit rate mode                            : Variable
  
  Bit rate                                 : 110 Kbps
  
  Maximum bit rate                         : 160 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 4 channels
  
  Channel positions                        : Front: L C R, Side: C
  
  Sampling rate                            : 48.0 KHz
  
  Frame rate                               : 46.875 fps (1024 spf)
  
  Compression mode                         : Lossy
  
  Stream size                              : 3.62 MiB (10%)
  
  Default                                  : No
  
  Alternate group                          : 1
  
  
  
  Audio #4
  
  ID                                       : 5
  
  Format                                   : AAC
  
  Format/Info                              : Advanced Audio Codec
  
  Format profile                           : LC
  
  Codec ID                                 : 40
  
  Duration                                 : 4mn 35s
  
  Bit rate mode                            : Variable
  
  Bit rate                                 : 110 Kbps
  
  Maximum bit rate                         : 160 Kbps
  
  Channel(s)                               : 2 channels
  
  Channel(s)_Original                      : 4 channels
  
  Channel positions                        : Front: L C R, Side: C
  
  Sampling rate                            : 48.0 KHz
  
  Frame rate                               : 46.875 fps (1024 spf)
  
  Compression mode                         : Lossy
  
  Stream size                              : 3.61 MiB (10%)
  
  Default                                  : No
  
  Alternate group                          : 1

  FFmpeg command is as follows :

  `ffmpeg -i "2chan.mov" -i "4chan.mov" -filter_complex "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]; [v]scale=-1:288[v2]; [a]channelsplit=channel_layout=quad(side)[FL][FR][SL][SR]" -map "[v2]" -map "[FL]" -map "[FR]" -map "[SL]" -map "[SR]" -c:v libx264 -pix_fmt yuv420p -b:v 700k -minrate 700k -maxrate 700k -bufsize 700k -r 25 -sc_threshold 25 -keyint_min 25 -g 25 -qmin 3 -qmax 51 -threads 8 -c:a aac -strict -2 -b:a 160k -ar 48000 -async 1 -ac 4 combined.mp4`

  Console output :

    ffmpeg version N-77883-gd7c75a5 Copyright (c) 2000-2016 the FFmpeg developers
  
        built with gcc 5.2.0 (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-libbs2b --enable-libcaca --
  
      enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
      ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
      le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
      able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
      ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
       --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
      e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --
  
      enable-lzma --enable-decklink --enable-zlib
  
        libavutil      55. 13.100 / 55. 13.100
  
        libavcodec     57. 22.100 / 57. 22.100
  
        libavformat    57. 21.101 / 57. 21.101
  
        libavdevice    57.  0.100 / 57.  0.100
  
        libavfilter     6. 25.100 /  6. 25.100
  
        libswscale      4.  0.100 /  4.  0.100
  
        libswresample   2.  0.101 /  2.  0.101
  
        libpostproc    54.  0.100 / 54.  0.100
  
      [mov,mp4,m4a,3gp,3g2,mj2 @ 0000000000575c00] ignoring 'frma' atom of 'mp4a', str
  
  eam format is 'mp4a'
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2chan.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2016-01-19 05:48:38
  
    Duration: 00:00:45.00, start: 0.000000, bitrate: 364 kb/s
  
      Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte1
  
  70m/smpte170m/bt709), 768x576, 196 kb/s, SAR 1:1 DAR 4:3, 25 fps, 25 tbr, 25 tbn
  
  , 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-01-19 05:48:40
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 00:00:00:00
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, flt
  
  p, 159 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-01-19 05:48:42
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00:00
  
      Stream #0:2(eng): Data: none (tmcd / 0x64636D74) (default)
  
      Metadata:
  
        creation_time   : 2016-01-19 05:49:42
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:00:00:00
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005da420] ignoring 'frma' atom of 'mp4a', str
  
  eam format is 'mp4a'
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '4chan.mov':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      creation_time   : 2016-01-19 04:11:52
  
    Duration: 00:19:58.00, start: 0.000000, bitrate: 5118 kb/s
  
      Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte1
  
  70m/smpte170m/bt709), 768x576, 4955 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc (defa
  
  ult)
  
      Metadata:
  
        creation_time   : 2016-01-19 04:11:52
  
        handler_name    : Apple Alias Data Handler
  
        encoder         : H.264
  
        timecode        : 00:28:33:21
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, quad, fltp,
  
   157 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-01-19 04:11:52
  
        handler_name    : Apple Alias Data Handler
  
      Stream #1:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
  
      Metadata:
  
        rotate          : 0
  
        creation_time   : 2016-01-19 04:11:52
  
        handler_name    : Apple Alias Data Handler
  
        timecode        : 00:28:33:21
  
  File 'Output_Complex_6.mp4' already exists. Overwrite ? [y/N] y
  
  -async is forwarded to lavfi similarly to -af aresample=async=1:min_hard_comp=0.
  
  100000:first_pts=0.
  
      Last message repeated 1 times
  
  [libx264 @ 000000000057d260] using SAR=1/1
  
  [libx264 @ 000000000057d260] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  
   SlowShuffle
  
  [libx264 @ 000000000057d260] profile High, level 2.1
  
  [libx264 @ 000000000057d260] 264 - core 148 r2638 7599210 - H.264/MPEG-4 AVC cod
  
  ec - Copyleft 2003-2015 - http://www.videolan.org/x264.html - options: cabac=1 r
  
  ef=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_pski
  
  p=1 chroma_qp_offset=-2 threads=8 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=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=25 keyint_min=13
  
   scenecut=25 intra_refresh=0 rc_lookahead=25 rc=cbr mbtree=1 bitrate=700 ratetol
  
  =1.0 qcomp=0.60 qpmin=3 qpmax=51 qpstep=4 vbv_maxrate=700 vbv_bufsize=700 nal_hr
  
  d=none filler=0 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'Output_Complex_6.mp4':
  
    Metadata:
  
      major_brand     : qt
  
      minor_version   : 537199360
  
      compatible_brands: qt
  
      title           : TestTitle
  
      encoder         : Lavf57.21.101
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 384x28
  
  8 [SAR 1:1 DAR 4:3], q=3-51, 700 kb/s, 25 fps, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        encoder         : Lavc57.22.100 libx264
  
      Side data:
  
        unknown side data type 10 (24 bytes)
  
      Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, 4.0, fltp,
  
  160 kb/s
  
      Metadata:
  
        encoder         : Lavc57.22.100 aac
  
      Stream #0:2: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, 4.0, fltp,
  
  160 kb/s
  
      Metadata:
  
        encoder         : Lavc57.22.100 aac
  
      Stream #0:3: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, 4.0, fltp,
  
  160 kb/s
  
      Metadata:
  
        encoder         : Lavc57.22.100 aac
  
      Stream #0:4: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, 4.0, fltp,
  
  160 kb/s
  
      Metadata:
  
        encoder         : Lavc57.22.100 aac
  
  Stream mapping:
  
    Stream #0:0 (h264) -> concat:in0:v0
  
    Stream #0:1 (aac) -> concat:in0:a0
  
    Stream #1:0 (h264) -> concat:in1:v0
  
    Stream #1:1 (aac) -> concat:in1:a0
  
    scale -> Stream #0:0 (libx264)
  
    channelsplit:FL -> Stream #0:1 (aac)
  
    channelsplit:FR -> Stream #0:2 (aac)
  
    channelsplit:SL -> Stream #0:3 (aac)
  
    channelsplit:SR -> Stream #0:4 (aac)
  
  Press [q] to stop, [?] for help
  
  frame=   85 fps=0.0 q=3.0 size=       6kB time=00:00:02.68 bitrate=  18.8kbits/s
  
  frame=  150 fps=148 q=3.0 size=      14kB time=00:00:05.24 bitrate=  21.3kbits/s
  
  frame=  198 fps=130 q=3.0 size=      65kB time=00:00:07.21 bitrate=  74.4kbits/s
  
  frame=  238 fps=118 q=3.0 size=     125kB time=00:00:08.78 bitrate= 116.2kbits/s
  
  frame=  271 fps=108 q=3.0 size=     171kB time=00:00:10.09 bitrate= 138.9kbits/s
  
  frame=  304 fps=100 q=3.0 size=     218kB time=00:00:11.45 bitrate= 156.0kbits/s
  
  frame=  339 fps= 96 q=3.0 size=     268kB time=00:00:12.84 bitrate= 171.0kbits/s
  
  frame=  372 fps= 93 q=-1.0 Lsize=     376kB time=00:00:14.80 bitrate= 208.0kbits
  
  /s speed=3.69x
  
  video:27kB audio:319kB subtitle:0kB other streams:0kB global headers:0kB muxing
  
  overhead: 8.551113%
  
  [libx264 @ 000000000057d260] frame I:15    Avg QP: 3.01  size:  1370
  
  [libx264 @ 000000000057d260] frame P:90    Avg QP: 3.00  size:    24
  
  [libx264 @ 000000000057d260] frame B:267   Avg QP: 3.00  size:    17
  
  [libx264 @ 000000000057d260] consecutive B-frames:  4.3%  0.0%  0.0% 95.7%
  
  [libx264 @ 000000000057d260] mb I  I16..4: 95.8%  0.0%  4.2%
  
  [libx264 @ 000000000057d260] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.1%  0.0
  
  %  0.0%  0.0%  0.0%    skip:99.9%
  
  [libx264 @ 000000000057d260] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0
  
  %  0.0%  direct: 0.0%  skip:100.0%  L0: 0.0% L1:100.0% BI: 0.0%
  
  [libx264 @ 000000000057d260] 8x8 transform intra:0.0% inter:50.0%
  
  [libx264 @ 000000000057d260] coded y,uvDC,uvAC intra: 3.1% 8.8% 8.2% inter: 0.0%
  
   0.0% 0.0%
  
  [libx264 @ 000000000057d260] i16 v,h,dc,p: 90%  5%  5%  0%
  
  [libx264 @ 000000000057d260] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 46% 29% 23%  0%  0%
  
   0%  0%  0%  0%
  
  [libx264 @ 000000000057d260] i8c dc,h,v,p: 76%  7% 17%  0%
  
  [libx264 @ 000000000057d260] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 000000000057d260] kb/s:14.64
  
  [aac @ 0000000000578320] Qavg: 65394.652
  
  [aac @ 0000000000593020] Qavg: 65473.359
  
  [aac @ 0000000000593940] Qavg: 65536.000
  
  [aac @ 0000000000594260] Qavg: 65536.000
  
  Exiting normally, received signal 2.
  
  Terminate batch job (Y/N)? Y