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• ffmpeg - incorrect number of image sequence based on duration and fps

  24 janvier 2015, par user2248745

  I’m trying to create image sequence from .mp4 file. Problem is, that I get incorrect number of image. ffprobe shows following output

  ffprobe version N-54921-g436616f Copyright (c) 2007-2013 the FFmpeg developers
  
    built on Jul 24 2013 18:07:04 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
    libavutil      52. 40.100 / 52. 40.100
  
    libavcodec     55. 19.100 / 55. 19.100
  
    libavformat    55. 12.102 / 55. 12.102
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 81.103 /  3. 81.103
  
    libswscale      2.  4.100 /  2.  4.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '../matlab/3_AncientDiscoveries1_stroje.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 1
  
      compatible_brands: mp42mp41
  
      creation_time   : 2013-08-15 12:35:00
  
    Duration: 00:10:00.00, start: -1.880000, bitrate: 1510 kb/s
  
      Stream #0:0(ces): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 164 kb/s
  
      Metadata:
  
        creation_time   : 2013-08-15 12:35:00
  
        handler_name    : Apple Sound Media Handler
  
      Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 708x574 [SAR 64:45 DAR 7552:4305], 1336 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        creation_time   : 2013-08-15 12:35:00
  
        handler_name    : Apple Video Media Handler

  I created image sequence using fps 25.0 and I would expect 15000 (=10*60*25) images, but there are 15048 images. I think it corresponds to negative start time (10*60+1.88)*25=15047

  ffmpeg -r fps -i ../matlab/3_AncientDiscoveries1_stroje.mp4 -f image2 outdir/image-%%07d.png

  Is there a way how to correct the expected number of images ? I need to do some postprocessing so I need to know exactly, where are those additional images from.

  Thanks a lot for your response

  filip

• electron ffmpeg mas build "Illegal instruction : 4"

  8 mars 2021, par Martin

  I am trying to release an electron app on the Mac Apple Store (mas), my electron app uses ffmpeg to render videos. In order to release my app on the mac apple store, It needs to be sandboxed, and by default ffmpeg makes calls to external libraries so I need to statically build ffmpeg and package it with my app. My code is on the 'mas-ffmpeg-fix' branch : https://github.com/MartinBarker/digify/tree/mas-ffmpeg-fix

  


  My static ffmpeg build works before I build my app, but after running electron-builder build --mac, the ffmpeg executable now fails with Illegal instruction: 4

  


  This is the full timeline of building/packaging/submitting my app to the mac apple store and where the error first appears :

  


  


  • In Digify repo :

    


  


  • clone, configure, and build static ffpmeg : “sudo rm -rf ffmpeg-mac/ && npm run download-ffmpeg”

    


  


  • download-ffmpeg command is inside package.json and runs this :
git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg-mac && cd ffmpeg-mac && ./configure pkg_config='pkg-config --static' --pkg-config-flags='--static' --libdir=/usr/local/lib --extra-version=ntd_20150128 --disable-shared --disable-lzma --enable-gpl --enable-pthreads --enable-nonfree --enable-libass --enable-libfdk-aac  --enable-libmp3lame  --enable-libx264 --enable-static --enable-filters --enable-runtime-cpudetect && make && cd ..

    


  


  • Check if any dylibb files in the static ffmpeg build with command : “otool -L ffmpeg-mac/ffmpeg | grep /usr/local”

    


  


  • If there are any, move them to folder in desktop, run ‘otool’ again to ensure there are no dynamic libraries, rebuild static ffmpeg.

    


  


  • there will now be a folder 'ffmpeg-mac' which contains static versions of ffmpeg and ffprobe

    


  


  


  Using ffmpeg with electron UI : works
Using Ffmpeg with command-line command :
/Users/martinbarker/Documents/projects/digify-new/ffmpeg-mac/ffmpeg -h
Works

  


  

  • Build mac mass app with “npm run build-mas“

  


  • When this command finishes it will output two files inside the /dist/mas/ folder : Digify.app and Digify-01.20.pkg (or whatever version number it is)
Ffmpeg command-line check :
/Users/martinbarker/Documents/projects/digify-new/dist/mas/Digify.app/Contents/Resources/ffmpeg -h
Illegal instruction : 4

  


  


  This is the first place the error appears, after building my mac mac-apple-store app, ffmpeg fails with this err.

  


  

  • Sign built app with .sh file : “sh mas-sign-script.sh”
view .sh file here

    

    • the .sh file will output Digify-mac.pkg

    


    


  


  • Easier command to both build & sign : “sudo rm -rf dist/mas/ && npm run build-mas && sh mas-sign-script.sh”

  


  • Upload the outputted “Digify-mac.pkg” file & submit to apple for review

  


  


  Once this app gets published in the store, if you download it and try to run an ffmpeg command with the electron UI, it fails with this error :

  


  /Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/lib/error.js:59 Uncaught (in promise) Error: Command failed with exit code 1: /Applications/Digify.app/Contents/Resources/ffmpeg -i /Users/martinbarker/Downloads/Felix Lebarty - Bobo/01. Bobo.mp3 -y -filter_complex concat=n=1:v=0:a=1 -c:a libmp3lame -b:a 320k /Users/martinbarker/Downloads/Felix Lebarty - Bobo/output-064237.mp3
ffmpeg version N-101191-g51a9f487ae-ntd_20150128 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  configuration: pkg_config='pkg-config --static' --pkg-config-flags=--static --libdir=/usr/local/lib --extra-version=ntd_20150128 --disable-shared --disable-lzma --enable-gpl --enable-pthreads --enable-nonfree --disable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libx264 --enable-static --enable-filters --enable-runtime-cpudetect
  libavutil      56. 65.100 / 56. 65.100
  libavcodec     58.125.100 / 58.125.100
  libavformat    58. 68.100 / 58. 68.100
  libavdevice    58. 12.100 / 58. 12.100
  libavfilter     7.107.100 /  7.107.100
  libswscale      5.  8.100 /  5.  8.100
  libswresample   3.  8.100 /  3.  8.100
  libpostproc    55.  8.100 / 55.  8.100
[mp3 @ 0x7feeae809c00] Estimating duration from bitrate, this may be inaccurate
Input #0, mp3, from '/Users/martinbarker/Downloads/Felix Lebarty - Bobo/01. Bobo.mp3':
  Metadata:
    comment         : 
    album           : Bobo
    artist          : Felix Lebarty
    title           : Funkytown Eklablog
    genre           : Boogie
    date            : 1984
  Duration: 00:05:19.53, start: 0.000000, bitrate: 320 kb/s
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
/Users/martinbarker/Downloads/Felix Lebarty - Bobo/output-064237.mp3: Operation not permitted
    at makeError (/Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/lib/error.js:59)
    at handlePromise (/Applications/Digify.app/Contents/Resources/app.asar/node_modules/execa/index.js:114)
    at async file:/Applications/Digify.app/Contents/Resources/app.asar/src/js/newindex.js:1162


  


  Command failed with exit code 1: Operation not permitted

  


• avformat/hlsenc : refine EXT-X-BYTERANGE support for segments

  19 septembre 2016, par Steven Liu

  avformat/hlsenc : refine EXT-X-BYTERANGE support for segments
  refine EXT-X-BYTERANGE tag,
  
  the spec link :
  
  https://tools.ietf.org/html/draft-pantos-http-live-streaming-19#section-4.3.2.2
  
  the apple doc :
  
  https://developer.apple.com/library/ios/technotes/tn2288/_index.html#
  
  //apple_ref/doc/uid/DTS40012238-CH1-BYTE_RANGE_SUPPORT_FOR_SEGMENTS
  command line :
  
  ./ffmpeg -i /Movies/objectC/a.mp4 -c copy -f hls -hls_time 7
  
   -hls_list_size 0 -hls_segment_size 2500000 -t 40 output-test.m3u8
  
  output :
  
  localhost:ffmpeg liuqi$ ll *.ts ;cat output-test.m3u8
  
   -rw-r—r—  1 liuqi  staff  2792176  9 12 14:44 output-test0.ts
  
   -rw-r—r—  1 liuqi  staff  3112528  9 12 14:44 output-test3.ts
  
   -rw-r—r—  1 liuqi  staff  3377420  9 12 14:44 output-test6.ts
  
   -rw-r—r—  1 liuqi  staff  1228016  9 12 14:44 output-test7.ts
  
   #EXTM3U
  
   #EXT-X-VERSION:4
  
   #EXT-X-TARGETDURATION:10
  
   #EXT-X-MEDIA-SEQUENCE:0
  
   #EXTINF:9.021000,
  
   #EXT-X-BYTERANGE:1334988@0
  
   output-test0.ts
  
   #EXTINF:3.000000,
  
   #EXT-X-BYTERANGE:721356@1334988
  
   output-test0.ts
  
   #EXTINF:3.000000,
  
   #EXT-X-BYTERANGE:735832@2056344
  
   output-test0.ts
  
   #EXTINF:6.000000,
  
   #EXT-X-BYTERANGE:1645940@0
  
   output-test3.ts
  
   #EXTINF:3.000000,
  
   #EXT-X-BYTERANGE:715152@1645940
  
   output-test3.ts
  
   #EXTINF:3.000000,
  
   #EXT-X-BYTERANGE:751436@2361092
  
   output-test3.ts
  
   #EXTINF:9.000000,
  
   #EXT-X-BYTERANGE:3377420@0
  
   output-test6.ts
  
   #EXTINF:3.960000,
  
   #EXT-X-BYTERANGE:1228016@0
  
   output-test7.ts
  
   #EXT-X-ENDLIST
  
   localhost:ffmpeg liuqi$
   ticket-id : #5839
  Signed-off-by : Steven Liu <lingjiujianke@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/hlsenc.c