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• Problem with invalid metadata of a FLAC file

  14 novembre 2022, par Florian Saurwein

  i need to upload audio files (mainly WAV/FLAC) to an API. I validate these files by checking the output of ffprobe.
I have a media file at hand that seemingly fulfills all requirements of the API (Sample rate, bitrate, etc.) but has one anomaly that probably causes the rejection. (It plays fine though) The file looks like this :

  


  $ ffprobe sample.flac 
ffprobe version 4.2.4-1ubuntu0.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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, flac, from 'sample.flac':
  Metadata:
    ENCODER         : Easy CD-DA Extractor (http://www.poikosoft.com)
  Duration: 00:04:42.31, start: 0.000000, bitrate: 572 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16


  


  Notice that the Metadata states, that the encoder is Easy CD-DA Extractor (http://www.poikosoft.com), however, running ffmpeg -i sample.flac -map_metadata -1 -c:a copy sample-out.flac and running ffprobe again, the actual encoder turns out to be Lavf58.29.100.

  


  $ ffprobe sample-out.flac
ffprobe version 4.2.4-1ubuntu0.1 Copyright (c) 2007-2020 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.3.0-10ubuntu2)
  configuration: --prefix=/usr --extra-version=1ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  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, flac, from 'sample-out.flac':
  Metadata:
    encoder         : Lavf58.29.100
  Duration: 00:04:42.31, start: 0.000000, bitrate: 572 kb/s
    Stream #0:0: Audio: flac, 44100 Hz, stereo, s16


  


  Now obviously, this is caused by this weird converter software, that encodes these files and puts the wrong encoder in the file's metadata.
Now I have some questions :

  


  

  • Is this a required specification of flac files to include the encoder in the file metadata ? Because the API documentation does not state anywhere if the metadata encoder has to match the actual encoder of the audio stream or what codecs are actually allowed.

  


  • How do I go about detecting such anomalies ? Because currently, I have to copy the file with ffmpeg, check the encoder of the copied file. This process takes unnecessary compute resources.

  


  


  Best regards,
Florian

  


• setPTS outputting wrong duration (Ffmpeg)

  16 septembre 2020, par WebDiva

  I have a video of duration 14 seconds. I applied the setPTS filter to make it 3 times slow. So the total duration should be 42s (14*3). But the output gives a 49s long video. Here is the command :

  


  ffmpeg -i video.mp4 -filter_complex "[0:v]setpts=3*PTS[v];[0:a]atempo=0.6,atempo=0.5[a]" -map "[v]" -map "[a]" output.mp4


  


  What is wrong with this command ? I tried it for different videos but all has the same weird issue. Any help will be appreciated. Regards.

  


  Log :

  


  ffmpeg version git-2020-08-31-4a11a6f Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.2.1 (GCC) 20200805
  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-libsrt --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-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libgsm --enable-librav1e --enable-libsvtav1 --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 58.100 / 56. 58.100
  libavcodec     58.101.101 / 58.101.101
  libavformat    58. 51.101 / 58. 51.101
  libavdevice    58. 11.101 / 58. 11.101
  libavfilter     7. 87.100 /  7. 87.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2018-11-20T06:28:07.000000Z
  Duration: 00:00:14.72, start: 0.000000, bitrate: 688 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(tv, unknown/bt470bg/unknown), 198x360 [SAR 1:1 DAR 11:20], 592 kb/s, 29.93 fps, 29.93 tbr, 29931 tbn, 59.86 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2018-11-20T06:28:07.000000Z
      handler_name    : IsoMedia File Produced by Google, 5-11-2011
File 'output.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 (h264) -> setpts
  Stream #0:1 (aac) -> atempo
  setpts -> Stream #0:0 (libx264)
  atempo -> Stream #0:1 (aac)
Press [q] to stop, [?] for help
[libx264 @ 0000021e37f15340] using SAR=1/1
[libx264 @ 0000021e37f15340] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000021e37f15340] profile High, level 1.3, 4:2:0, 8-bit
[libx264 @ 0000021e37f15340] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - 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:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    encoder         : Lavf58.51.101
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p(progressive), 198x360 [SAR 1:1 DAR 11:20], q=-1--1, 29.93 fps, 29931 tbn, 29.93 tbc (default)
    Metadata:
      encoder         : Lavc58.101.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc58.101.101 aac
frame= 1313 fps=256 q=-1.0 Lsize=    2241kB time=00:00:44.11 bitrate= 416.2kbits/s dup=875 drop=0 speed=8.61x
video:1500kB audio:693kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.182632%
[libx264 @ 0000021e37f15340] frame I:7     Avg QP:21.61  size: 18425
[libx264 @ 0000021e37f15340] frame P:331   Avg QP:24.78  size:  3593
[libx264 @ 0000021e37f15340] frame B:975   Avg QP:31.57  size:   223
[libx264 @ 0000021e37f15340] consecutive B-frames:  0.8%  0.2%  1.6% 97.5%
[libx264 @ 0000021e37f15340] mb I  I16..4:  3.6% 31.1% 65.3%
[libx264 @ 0000021e37f15340] mb P  I16..4:  0.8%  1.3%  4.2%  P16..4: 37.0% 29.0% 15.9%  0.0%  0.0%    skip:11.7%
[libx264 @ 0000021e37f15340] mb B  I16..4:  0.0%  0.0%  0.2%  B16..8:  8.4%  2.8%  1.2%  direct: 0.4%  skip:87.0%  L0:61.8% L1:31.0% BI: 7.3%
[libx264 @ 0000021e37f15340] 8x8 transform intra:22.3% inter:18.7%
[libx264 @ 0000021e37f15340] coded y,uvDC,uvAC intra: 73.2% 85.7% 52.9% inter: 11.6% 7.4% 0.7%
[libx264 @ 0000021e37f15340] i16 v,h,dc,p: 25% 33% 22% 19%
[libx264 @ 0000021e37f15340] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 28% 19%  4%  5%  4%  7%  5%  7%
[libx264 @ 0000021e37f15340] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 26% 13%  5%  7%  6%  7%  6%  7%
[libx264 @ 0000021e37f15340] i8c dc,h,v,p: 38% 29% 22% 11%
[libx264 @ 0000021e37f15340] Weighted P-Frames: Y:2.7% UV:0.3%
[libx264 @ 0000021e37f15340] ref P L0: 86.1%  8.9%  3.6%  1.4%  0.1%
[libx264 @ 0000021e37f15340] ref B L0: 94.7%  4.6%  0.8%
[libx264 @ 0000021e37f15340] ref B L1: 99.3%  0.7%
[libx264 @ 0000021e37f15340] kb/s:280.02
[aac @ 0000021e3847c900] Qavg: 729.586


  


• Find mp4 files with certain file naming in subfolders and extract frames from it every second with ffmpeg

  18 février 2019, par Philipp

  I have a folder with several subfolders that contain mp4 files.
  I want to extract frames of those mp4 files every second, but only of mp4 files that contain "abc" in the file name.
  Those frames should be saved in a separated "images" folder with a naming that has frame count of the corresponding video.
  

  The file structure with folder and subfolders and how I imagine the file naming of the frames :

  |main_folder
  
  |
  
  ├── folder1 
  
  |   ├── abc123.mp4
  
  |   └── xyz123.mp4
  
  ├── folder2
  
  |   ├── abc456.mp4
  
  |   └── xyz456.mp4
  
  |       ├── folder2.1
  
  |          └──abc183.mp4
  
  |          └──xyz183.mp4
  
  ├── folder3
  
  |   ├── abc789.mp4
  
  |   └── xyz789.mp4
  
  ├── images
  
      ├── video1-frame1.jpg
  
      ├── video1-frame30.jpg
  
      ├── video1-frame60.jpg
  
       ...
  
      ├── video2-frame1.jpg
  
      ├── video2-frame30.jpg
  
      ├── video2-frame60.jpg

  So far I only have this and can’t get any further :(

  for file in *.mp4; do ffmpeg -i "$file" -vf fps=1 -q:v 3 "images/${i%.*}_frames%d.jpg"; done

  I am missing the search in the subdirectories and the search for mp4s that only have "abc" in their file name.