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• Using ffmpeg to split video files by size [closed]

  2 février 2023, par user2548469

  I'm trying to write a batch file using ffmpeg to automate the redundant daily task of taking footage from work that's recorded in 4gb blocks (which is standard in most DSLR cameras & GoPro's), and split the clips into 2gb files for streaming purposes. The idea is to have the script check external drive FOOTAGE's folder @import and split files after 2gb (since the max size is 4gb, this will alleviate the need for more than one split).

  



  I'm also trying to amend the filenames of the split files, so FILE1 is 4gb, it splits into FILE1_1 and FILE1_2 which are 2gb each, respectively. Everything I've tried has just copied the original file into two new, identical files - no split or anything.

  



  After doing some Googling and reading some of the answers here, I found this post, but it's based on duration, not size (recording video footage at varying levels of quality makes this pointless) : Split into equal parts and convert many mp4 videos using ffmpeg

  



  Can someone help me with this ? I haven't come across any usable solutions utilizing what I understand to be the method, using -fs limit_size, and I really want to understand how this works.

  



  UPDATE : Also found this, but it hasn't been updated in four years and I don't see anything in there regarding splitting that will prove helpful :

  



  https://github.com/kcm1700/VideoSplitter/blob/master/

  


• Add lensfun filter

  13 juillet 2018, par Stephen Seo

  Add lensfun filter
  Lensfun is a library that applies lens correction to an image using a
  
  database of cameras/lenses (you provide the camera and lens models, and
  
  it uses the corresponding database entry's parameters to apply lens
  
  correction). It is licensed under LGPL3.
  The lensfun filter utilizes the lensfun library to apply lens
  
  correction to videos as well as images.
  This filter was created out of necessity since I wanted to apply lens
  
  correction to a video and the lenscorrection filter did not work for me.
  While this filter requires little info from the user to apply lens
  
  correction, the flaw is that lensfun is intended to be used on indvidual
  
  images. When used on a video, the parameters such as focal length is
  
  constant, so lens correction may fail on videos where the camera's focal
  
  length changes (zooming in or out via zoom lens). To use this filter
  
  correctly on videos where such parameters change, timeline editing may
  
  be used since this filter supports it.
  Note that valgrind shows a small memory leak which is not from this
  
  filter but from the lensfun library (memory is allocated when loading
  
  the lensfun database but it somehow isn't deallocated even during
  
  cleanup ; it is briefly created in the init function of the filter, and
  
  destroyed before the init function returns). This may have been fixed by
  
  the latest commit in the lensfun repository ; the current latest release
  
  of lensfun is almost 3 years ago.
  Bi-Linear interpolation is used by default as lanczos interpolation
  
  shows more artifacts in the corrected image in my tests.
  The lanczos interpolation is derived from lenstool's implementation of
  
  lanczos interpolation. Lenstool is an app within the lensfun repository
  
  which is licensed under GPL3.
  v2 of this patch fixes license notice in libavfilter/vf_lensfun.c
  v3 of this patch fixes code style and dependency to gplv3 (thanks to
  
  Paul B Mahol for pointing out the mentioned issues).
  v4 of this patch fixes more code style issues that were missed in
  
  v3.
  v5 of this patch adds line breaks to some of the documentation in
  
  doc/filters.texi (thanks to Gyan Doshi for pointing out the issue).
  v6 of this patch fixes more problems (thanks to Moritz Barsnick for
  
  pointing them out).
  v7 of this patch fixes use of sqrt() (changed to sqrtf() ; thanks to
  
  Moritz Barsnick for pointing this out). Also should be rebased off of
  
  latest master branch commits at this point.
  Signed-off-by : Stephen Seo <seo.disparate@gmail.com>
  

  • [DH] configure
  • [DH] doc/filters.texi
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/allfilters.c
  • [DH] libavfilter/vf_lensfun.c

• 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)
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