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• ffmpeg - over 1000 files into a mp4

  20 octobre 2013, par Fabrizio

  I am using FreeBSD and ffmpeg and I am trying to convert over 1000 files into an mp4. Keep in mind that I am completely NEW to ffmpeg and that in the future I might have up to 3600 images.

  I was thinking that simply executing :

  ffmpeg -i /usr/local/www/tmp/phpFa5LT3/*.jpg -r 2 output.mp4

  would work, but I keep getting

  ffmpeg version 0.7.12, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Jun  9 2013 12:48:13 with gcc 4.2.1 20070831 patched [FreeBSD]
  
    configuration: --prefix=/usr/local --mandir=/usr/local/man --enable-shared --enable-gpl --enable-postproc --enable-avfilter --enable-pthreads --enable-memalign-hack --enable-runtime-cpudetect --cc=cc --extra-cflags='-msse -I/usr/local/include/vorbis -I/usr/local/include' --extra-ldflags='-L/usr/local/lib ' --extra-libs=-pthread --disable-debug --disable-libaacplus --disable-indev=alsa --disable-outdev=alsa --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libcelt --disable-libdirac --disable-libfaac --enable-libfreetype --enable-frei0r --disable-libgsm --disable-libmp3lame --enable-libopencv --enable-libopenjpeg --disable-librtmp --enable-libschroedinger --disable-ffplay --disable-libspeex --enable-libtheora --disable-vaapi --disable-vdpau --disable-libvo-aacenc --disable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid
  
    libavutil    50. 43. 0 / 50. 43. 0
  
    libavcodec   52.123. 0 / 52.123. 0
  
    libavformat  52.111. 0 / 52.111. 0
  
    libavdevice  52.  5. 0 / 52.  5. 0
  
    libavfilter   1. 80. 0 /  1. 80. 0
  
    libswscale    0. 14. 1 /  0. 14. 1
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  Input #0, image2, from '20131019205500.jpg':
  
    Duration: 00:00:00.50, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: mjpeg, yuvj420p, 320x240 [PAR 96:96 DAR 4:3], 2 tbr, 2 tbn, 2 tbc
  
  Too many output files

  When I try :

  ffmpeg -y -f image2 -r 4 -i /usr/local/www/tmp/phpFa5LT3/%14d.jpg output.mp4

  I get :

  [same output but last line reads]
  
  /usr/local/www/tmp/phpFa5LT3/%12d.jpg: No such file or directory

  If I reduce the number of files to just a 100 or so, I can do it without any problems... Do you know what the problem might be ?

  #ulimit -a
  
  cpu time               (seconds, -t)  unlimited
  
  file size           (512-blocks, -f)  unlimited
  
  data seg size           (kbytes, -d)  33554432
  
  stack size              (kbytes, -s)  524288
  
  core file size      (512-blocks, -c)  unlimited
  
  max memory size         (kbytes, -m)  unlimited
  
  locked memory           (kbytes, -l)  unlimited
  
  max user processes              (-u)  5547
  
  open files                      (-n)  230400
  
  virtual mem size        (kbytes, -v)  unlimited
  
  swap limit              (kbytes, -w)  unlimited
  
  sbsize                   (bytes, -b)  unlimited
  
  pseudo-terminals                (-p)  unlimited

• Creating an Init file from existing non-fragmented, segmented MP4 files

  20 novembre 2018, par slhck

  I am performing chunked encodes of longer video files, where I’ve split the original file into individual sequences that I have encoded separately. These sequences are files of different length, depending on where the scene cuts appear—they may be between 2 and 5 seconds long. They all start with an I-frame and are standalone.

  My encoded sequences are all MP4s, e.g. :

  test_0000.mp4
  
  test_0001.mp4
  
  test_0002.mp4
  
  test_0003.mp4
  
  test_0004.mp4

  They all have common properties :

  $ mp4info test_0000.mp4
  
  
  
  File:
  
    major brand:      isom
  
    minor version:    200
  
    compatible brand: isom
  
    compatible brand: iso2
  
    compatible brand: mp41
  
    fast start:       no
  
  
  
  Movie:
  
    duration:   2016 ms
  
    time scale: 1000
  
    fragments:  no
  
  
  
  ...

  Now, in order to play those with a DASH player, I have to create an initialization segment and individual fragmented MP4s.

  I could generate the fragmented MP4s via mp4fragment which I run on each standalone MP4 file :

  $ mp4info test_0000.m4s
  
  File:
  
    major brand:      isom
  
    minor version:    200
  
    compatible brand: isom
  
    compatible brand: iso2
  
    compatible brand: mp41
  
    compatible brand: iso5
  
    fast start:       yes
  
  
  
  Movie:
  
    duration:   2016 ms
  
    time scale: 1000
  
    fragments:  yes
  
  
  
  ...

  But obviously, these are now not according to spec, and all contain a moov atom :

  

  What I’d need is individual media segments with only one moof and mdat box, which then require an initialization segment with only a moov box.

  How can I generate that from the existing, already encoded segments ?

  I know this appears like an XY problem. In principle, I could already segment my original file directly after encoding, and run those encodes at the same time, e.g. using ffmpeg’s dash muxer, or MP4Box, however :

  • There is almost no control over the resulting segment sizes, with respect to minimum and maximum duration
  • This approach does not parallelize

  I have also checked Bento4 ; it does not seem to offer this functionality. Neither does FFmpeg. MP4Box behaves similarly. They all assume you have one long file to start with.

  ---

  I see I could splice off the ftyp and moov boxes from these “fake fragments” in order to create an initialization segment. But I would end up with segments containing multiple moof and mdat boxes, which is not according to the specification – it only allows one fragment and media data box :

  4. Media Segments

  […] one optional Segment Type Box (styp) followed by a single Movie Fragment Box (moof) followed by one or more Media Data Boxes (mdat).

  I guess I can live with this the styp not being present.

• fftools/graphprint : Add execution graph printing

  15 mai, par softworkz

  fftools/graphprint : Add execution graph printing
  The key benefits are :
   Different to other graph printing methods, this is outputting :
  
    - all graphs with runtime state
  
      (including auto-inserted filters)
  
    - each graph with its inputs and outputs
  
    - all filters with their in- and output pads
  
    - all connections between all input- and output pads
  
    - for each connection :
  
      - the runtime-negotiated format and media type
  
      - the hw context
  
      - if video hw context, both : hw pixfmt + sw pixfmt
  
   Output can either be printed to stdout or written to specified file
  
   Output is machine-readable
  
   Use the same output implementation as ffprobe, supporting multiple
  
    formats
  Signed-off-by : softworkz <softworkz@hotmail.com>
  

  • [DH] doc/ffmpeg.texi
  • [DH] fftools/Makefile
  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_filter.c
  • [DH] fftools/ffmpeg_opt.c
  • [DH] fftools/graph/graphprint.c
  • [DH] fftools/graph/graphprint.h
  • [DH] fftools/textformat/avtextformat.c
  • [DH] fftools/textformat/avtextformat.h
  • [DH] fftools/textformat/tf_mermaid.c
  • [DH] fftools/textformat/tf_mermaid.h