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• Convert mp3 -> Video with static image ( ffmpeg/libav & BASH )

  17 avril 2022, par Max

  Some years ago I used the following bash script to get a video out of mp3's and one image (so the image in the video was freezed over the length of the mp3), which worked out fine.

  



  i=0;
for file in *.mp3; 
do 
i=$((i+1));
ffmpeg -loop 1 -shortest -y -i image.jpg -i $file -acodec copy -vcodec libx264 $file.flv;
done


  



  Now I wanted to use this again for doing the same.

  



  Problem :

  



  It does not stop converting at the end of the mp3. Means the current mp3 file eg. has a length of 3 minutes and the script converts until forever or I stop it, so the length of the flv is much bigger than 3 minutes.

  



  (ffmpeg is installed, but with libav the same happens)

  



  Output :

  



  ffmpeg version 1.2.6-7:1.2.6-1~trusty1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr 26 2014 18:52:58 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --arch=amd64 --disable-stripping --enable-avresample --enable-pthreads --enable-runtime-cpudetect --extra-version='7:1.2.6-1~trusty1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  libavutil      52. 18.100 / 52. 18.100
  libavcodec     54. 92.100 / 54. 92.100
  libavformat    54. 63.104 / 54. 63.104
  libavdevice    53.  5.103 / 53.  5.103
  libavfilter     3. 42.103 /  3. 42.103
  libswscale      2.  2.100 /  2.  2.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[image2 @ 0x6d0740] max_analyze_duration 5000000 reached at 5000000 microseconds
Input #0, image2, from 'Bild2.png':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgba, 382x417, 25 fps, 25 tbr, 25 tbn, 25 tbc
[mp3 @ 0x6c4ac0] max_analyze_duration 5000000 reached at 5015510 microseconds
[mp3 @ 0x6c4ac0] Estimating duration from bitrate, this may be inaccurate
Input #1, mp3, from 'sons.mp3':
  Duration: 00:00:35.11, start: 0.000000, bitrate: 127 kb/s
    Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 128 kb/s
[libx264 @ 0x6da700] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0x6da700] profile High 4:4:4 Predictive, level 2.1, 4:4:4 8-bit
[libx264 @ 0x6da700] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - 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=4 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, flv, to 'sons.mp3.flv':
  Metadata:
    encoder         : Lavf54.63.104
    Stream #0:0: Video: h264 ([7][0][0][0] / 0x0007), yuv444p, 382x417, q=-1--1, 1k tbn, 25 tbc
    Stream #0:1: Audio: mp3 ([2][0][0][0] / 0x0002), 44100 Hz, stereo, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (png -> libx264)
  Stream #1:0 -> #0:1 (copy)
Press [q] to stop, [?] for help


  


• Use a video editing library (not executable) via Node [on hold]

  25 septembre 2018, par Merc

  I need to edit clips using node. I am looking around, and most (if not all) libraries seem (like Fluent FFMpeg) seem to be based on the fact that they run FFMPEG as an executable and get the resulting output.

  That’s not what I want. I worked with FFMPEG executable in the past, and I know how flaky it is in terms of return codes and error codes.

  Ideally, I would love to find a native library for video editing and make calls using node.

  In terms of libraries :

  • Gstreamer
  • FFmpeg/LibAV (does they come with C libraries to bind to ?)
  • libVLC

  In terms of binding with them :

  • node-gir. Gstreamer seems to have updated git files

  • native bindings. For example Gstreamer has gstreamer-superficial. I couldn’t find any javascript bindings forFFMPEG — only "run the executable and hope for the best" libraries

  • VLC has a bindings library that is quite old and had its last commit years ago.

  Am I getting this all wrong ?
  My ideal outcome is to have a nice, robust library that I use directly using node, but my lack of experience in terms of using native libraries, and the somehow fragmented world of video editing libraries.

• ffmpeg recoded mp4 files error on mobiles in Video JS

  10 janvier 2019, par KJS

  We are converting seriously old .flv files to MP4 with FFMPEG. These are at least 10 years old.
  Back then all were rendered with early versions of Adobe Premiere.

  On desktop browsers all the files work and stream (...watching them feels like going back a century !)

  But when requesting the videos on the same pages on mobile devices (android and ios) Video JS doesn’t even show up.
  Perhaps the codec is just too old, but I was wondering if there could be another reason when converting them with this line :

  for i in *.flv; do ffmpeg -i "$i" "${i%.*}.mp4"; done

  If not, is it possible to detect this in Video JS, so we can show an announcement that the video is only visible on desktops ?

  I hope someone here has this knowledge !

  added on request of llogan

  ffmpeg version N-78967-gbaec6d8 Copyright (c) 2000-2016 the FFmpeg developers   built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)   configuration: --prefix=/root/ffmpeg_build
  
  --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265   libavutil      55. 19.100 / 55. 19.100   libavcodec     57. 28.100 / 57. 28.100   libavformat    57. 28.100 / 57. 28.100   libavdevice    57.  0.101 / 57.  0.101   libavfilter     6. 39.102 / 
  
  6. 39.102   libswscale      4.  0.100 /  4.  0.100   libswresample   2.  0.101 /  2.  0.101   libpostproc    54.  0.100 / 54.  0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'a_4293_06.mp4':   Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf57.28.100   Duration: 00:01:40.10, start: 0.023220, bitrate: 492 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x240, 376 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 123 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler At least one output file must be specified