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• Failed to convert webm audio file to mp4 using FFMPEG

  22 février 2021, par Shijin TR

  I have a webm audio file , I was trying to convert it into mp4 using ffmpeg. But it is failed to create the mp4. The info about the file is as follows.

  



  fmpeg -i 54ebe077-96fc-4ace-9a38-f13c58807322.webm -hide_banner

Input #0, matroska,webm, from '54ebe077-96fc-4ace-9a38-f13c58807322.webm':
  Metadata:
    encoder         : Lavf56.40.101
    creation_time   : 2019-10-22T11:19:12.000000Z
  Duration: 00:00:24.16, start: 0.000000, bitrate: 41 kb/s
    Stream #0:0: Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 30 fps, 30 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1: Audio: opus, 48000 Hz, mono, fltp (default)
At least one output file must be specifiedffmpeg -i  54ebe077-96fc-4ace-9a38-f13c58807322.webm -qscale 0 out.mp4


  



  I was tried to convert it using the following command

  



  ffmpeg -i  54ebe077-96fc-4ace-9a38-f13c58807322.webm -qscale 0 out.mp4


  



  It throws errors

  



  [opus @ 0x56489c7f9840] LBRR frames is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.
[opus @ 0x56489c7f9840] Error decoding a SILK frame.
[opus @ 0x56489c7f9840] Error decoding an Opus frame.
Too many packets buffered for output stream 0:1.
[aac @ 0x56489c82d640] Qavg: 59180.625
[aac @ 0x56489c82d640] 2 frames left in the queue on closing
Conversion failed!


  



  How to fix this issue ? I have played the file in VLC and I can hear the sound from the source file. But failed to convert it

  


• ffmpeg lose frames when extracting them

  11 octobre 2019, par Francisco Isoardi Prieto

  When I extract all frames from a video, FFmpeg lose one frame. I tried multiple options, like adding more parameters to the function, but none of them worked.

  ffmpeg -i Multicam420-30a.mp4 -framerate 30 frame%08d.jpg

  ffmpeg version N-94077-g01d8c72b95 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190621
  configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libmfx —enable-amf —enable-ffnvcodec —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt
  libavutil 56. 29.100 / 56. 29.100
  libavcodec 58. 53.100 / 58. 53.100
  libavformat 58. 28.100 / 58. 28.100
  libavdevice 58. 7.100 / 58. 7.100
  libavfilter 7. 55.100 / 7. 55.100
  libswscale 5. 4.101 / 5. 4.101
  libswresample 3. 4.100 / 3. 4.100
  libpostproc 55. 4.100 / 55. 4.100
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000023af91f9e80] st : 0 edit list : 1 Missing key frame while searching for timestamp : 0
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000023af91f9e80] st : 0 edit list 1 Cannot find an index entry before timestamp : 0.
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ’Multicam420-30a.mp4’ :
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : mp41mp42
  creation_time : 2019-08-20T01:30:57.000000Z
  Duration : 00:00:01.00, start : 0.000000, bitrate : 11208 kb/s
  Stream #0:0(eng) : Video : h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 11007 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
  Metadata :
  creation_time : 2019-08-20T01:30:57.000000Z
  encoder : AVC Coding
  Stream #0:1(eng) : Audio : aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 192 kb/s (default)
  Metadata :
  creation_time : 2019-08-20T01:30:57.000000Z
  Stream mapping :
  Stream #0:0 -> #0:0 (h264 (native) -> mjpeg (native))
  Press [q] to stop, [?] for help
  [swscaler @ 0000023afb923740] deprecated pixel format used, make sure you did set range correctly
  Output #0, image2, to ’frame%08d.jpg’ :
  Metadata :
  major_brand : isom
  minor_version : 512
  compatible_brands : mp41mp42
  encoder : Lavf58.28.100
  Stream #0:0(eng) : Video : mjpeg, yuvj420p(pc), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 30 fps, 30 tbn, 30 tbc (default)
  Metadata :
  creation_time : 2019-08-20T01:30:57.000000Z
  encoder : Lavc58.53.100 mjpeg
  Side data :
  cpb : bitrate max/min/avg : 0/0/200000 buffer size : 0 vbv_delay : -1
  frame= 29 fps= 17 q=24.8 Lsize=N/A time=00:00:00.96 bitrate=N/A speed=0.557x
  video:3153kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  As you can see, the original video has 30 frames and last 1 second, and the output frames are 29 and less than a second.

• FFmpeg compose, multi layers and filters

  10 octobre 2019, par jadeshohy

  Pretty new to FFmpeg. We would like to use FFmpeg as a important part of an AR project.

  Currently, we find it is not easy for us.

  We want to compose the footages with FFmpeg.

  We got 5 layers, wanted to blend them with specific mode, like the things in After Effects.

  • layer-1/ [A.webm] video，vp9 codec, which has a transparent BG,has to be added as [normal mode]

  • layer-2/ [B.mp4] video, optical-flare things with black BG,has to be added as [screen mode]

  • layer-3/ [C.mp4] video, some motion graphic things with light BG,has to be added as [overlay mode]

  • layer-4/ [BG.MP4], backgound things, has to be added as [normal mode]

  After we blend those 4 (like pre-compose,use blend filter), we want to add another layer-5/[icon.png] which is the special icon.

  Layer-5 need to overlay the pre-compose. We have to overlay it at the special position (use overlay filter ?).

  Cause [icon.png] may change frequently. we want to deal with that after the 4 layer blending.

  But at the first step, when we set normal mode for layer-1 in blend filter, layer-1 [A.webm] lost the transparent BG，it gave us a black BG which block all other things.
  Blend filter can not handle the alpha channel of vp9 webm ?
  When we set the mode of layer-1 to screen mode,the translucent thing was not what we need.

  Could you please give us some commands to achieve the blend above ?

  The commands that really work will be extremely useful for our FFmpeg initiation.

  ffmpeg -c:v libvpx-vp9 -i transparent.webm -i bg.mp4 -filter_complex "[0:v]format=yuva420p [a]; [1:v]format=yuv420p [b]; [a][b]blend=all_mode='normal':shortest=1:all_opacity=1,format=yuv420p" output.mp4 >log
  
  ffmpeg version 4.1.4 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1.4_1 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/adoptopenjdk-12.0.1.jdk/Contents/Home/include/darwin' --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-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-videotoolbox --disable-libjack --disable-indev=jack --enable-libaom --enable-libsoxr
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  [libvpx-vp9 @ 0x7f8876008600] v1.8.0
  
      Last message repeated 1 times
  
  Input #0, matroska,webm, from 'transparent.webm':
  
    Metadata:
  
      encoder         : Chrome
  
    Duration: N/A, start: 0.000000, bitrate: N/A
  
      Stream #0:0(eng): Video: vp9 (Profile 0), yuva420p(tv), 640x360, SAR 1:1 DAR 16:9, 60 fps, 60 tbr, 1k tbn, 1k tbc (default)
  
      Metadata:
  
        alpha_mode      : 1
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'bg.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.83.100
  
    Duration: 00:00:04.00, start: 0.000000, bitrate: 728 kb/s
  
      Stream #1:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 725 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  [libvpx-vp9 @ 0x7f8877806600] v1.8.0
  
  Stream mapping:
  
    Stream #0:0 (libvpx-vp9) -> format
  
    Stream #1:0 (h264) -> format
  
    format -> Stream #0:0 (libx264)
  
  Press [q] to stop, [?] for help
  
  [libvpx-vp9 @ 0x7f8877806600] v1.8.0
  
  [libx264 @ 0x7f8877817200] using SAR=1/1
  
  [libx264 @ 0x7f8877817200] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7f8877817200] profile High, level 3.1
  
  [libx264 @ 0x7f8877817200] 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=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 'output.mp4':
  
    Metadata:
  
      encoder         : Lavf58.20.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 60 fps, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        encoder         : Lavc58.35.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=  239 fps=113 q=-1.0 Lsize=     232kB time=00:00:03.93 bitrate= 482.5kbits/s dup=1 drop=2 speed=1.86x
  
  video:228kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.586669%
  
  [libx264 @ 0x7f8877817200] frame I:1     Avg QP:20.55  size:  5385
  
  [libx264 @ 0x7f8877817200] frame P:62    Avg QP:24.42  size:  2373
  
  [libx264 @ 0x7f8877817200] frame B:176   Avg QP:31.31  size:   456
  
  [libx264 @ 0x7f8877817200] consecutive B-frames:  1.3%  0.8%  2.5% 95.4%
  
  [libx264 @ 0x7f8877817200] mb I  I16..4: 18.6% 68.4% 13.0%
  
  [libx264 @ 0x7f8877817200] mb P  I16..4:  1.6%  4.0%  0.7%  P16..4: 14.8%  7.0%  4.5%  0.0%  0.0%    skip:67.5%
  
  [libx264 @ 0x7f8877817200] mb B  I16..4:  0.2%  0.0%  0.0%  B16..8: 17.4%  2.5%  0.4%  direct: 0.5%  skip:78.9%  L0:53.1% L1:40.4% BI: 6.6%
  
  [libx264 @ 0x7f8877817200] 8x8 transform intra:60.1% inter:60.4%
  
  [libx264 @ 0x7f8877817200] coded y,uvDC,uvAC intra: 16.6% 27.4% 10.7% inter: 3.0% 2.2% 0.1%
  
  [libx264 @ 0x7f8877817200] i16 v,h,dc,p: 56% 37%  6%  2%
  
  [libx264 @ 0x7f8877817200] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40%  6% 48%  1%  1%  1%  1%  1%  1%
  
  [libx264 @ 0x7f8877817200] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 22% 23%  3%  3%  4%  3%  4%  3%
  
  [libx264 @ 0x7f8877817200] i8c dc,h,v,p: 57% 20% 21%  2%
  
  [libx264 @ 0x7f8877817200] Weighted P-Frames: Y:0.0% UV:0.0%
  
  [libx264 @ 0x7f8877817200] ref P L0: 69.3% 12.8% 13.6%  4.3%
  
  [libx264 @ 0x7f8877817200] ref B L0: 92.9%  5.9%  1.1%
  
  [libx264 @ 0x7f8877817200] ref B L1: 96.1%  3.9%
  
  [libx264 @ 0x7f8877817200] kb/s:467.59