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• ffmpeg select subclips from large video bash and create outputfile names

  29 juin 2018, par martins

  I am using bash command on a Mac Terminal. For each of the 250 .mp4 files in a directory I need to create a new outputfile which extracts 4 subclips from each inputfile : 1st subclip (from second 10 to 20), 2nd subclip (10 seconds at a 33% stage of the inputfile), 3rd subclip (10 seconds at a 66% of the inputfile), and a 4th subclip (10 seconds starting 30seconds before the end of the inputfile). Each inputfile has a different length of about 10-15minutes.

  I tried with one inputfile and the following bash script works :

  #!/bin/bash
  
  for file in *.mp4; do ffmpeg -i "$file" -vf "select='between(t, 10, 20) + between(t, 197, 207) + between(t, 393, 403) + between(t, 570,580)',
  
  setpts=N/FRAME_RATE/TB" -qscale 0 -af "aselect='between(t, 10, 20) + 
  
  between(t, 197, 207) + between(t, 393, 403) + between(t, 570, 580)', 
  
  asetpts=N/SR/TB" outputfile.mp4; done

  However, I don’t know how to loop it over the 250 mp4 files. Specifically, I have 2 issues :

  1. The above code shows specific seconds I manually checked from the inputfile I used to test the code. I need to automatize the code according to the timings above.
  2. Name the outputfile the same as the inputfile but adding "_1" suffix

  In sum, I have a directory with inputfiles between 10-15minutes long :

  inputfile1.mp4
  
  inputfile2.mp4
  
  inputfile3.mp4
  
  .......
  
  inputfile250.mp4

  And I want the same directory with inputfiles and outputfiles together :

  inputfile1.mp4
  
  inputfile1_1.mp4 #this is 40 seconds long
  
  inputfile2.mp4
  
  inputfile2_1.mp4 #this is 40 seconds long
  
  inputfile3.mp4
  
  inputfile3_1.mp4 #this is 40 seconds long
  
  .......
  
  inputfile250.mp4
  
  inputfile250_1.mp4 #this is 40 seconds long

  Thank you very much in advance.

• avformat/mpegts : parse large PMTs with multiple tables

  11 juin 2018, par Aman Gupta

  avformat/mpegts : parse large PMTs with multiple tables
  In 9152c1e4955, the mpegts parser was taught how to parse
  
  PMT sections which contained multiple tables. That commit
  
  fixed parsing of PMT packets from some cable providers,
  
  which included a special SCTE table (0xc0) before the
  
  standard program map table (0x2).
  Sometimes, however, the combined 0xc0 and 0x2 tables are
  
  larger than a single TS packet (188 bytes). The mpegts parser
  
  already attempts to parse sections which span multiple packets,
  
  but still assumed that the split section only contained one
  
  table.
  This patch fixes parsing of such a sample[1].
  Before :
      Input #0, mpegts, from 'combined-pmt-tids-split.ts' :
  
        Duration : 00:00:01.26, start : 39188.931756, bitrate : 597 kb/s
  
        Program 1
  
        No Program
  
          Stream #0:0[0xeff] : Audio : ac3, 48000 Hz, mono, fltp, 64 kb/s
  
          Stream #0:1[0xefd] : Audio : mp3, 0 channels, fltp
  
          Stream #0:2[0xefe] : Unknown : none
  After :
      Input #0, mpegts, from 'combined-pmt-tids-split.ts' :
  
        Duration : 00:00:01.27, start : 39188.931756, bitrate : 589 kb/s
  
        Program 1
  
          Stream #0:0[0xefd] : Video : h264 ([27][0][0][0] / 0x001B), none, 59.94 fps, 59.94 tbr, 90k tbn, 180k tbc
  
          Stream #0:1[0xefe](eng) : Audio : ac3 ([129][0][0][0] / 0x0081), 48000 Hz, stereo, fltp, 384 kb/s
  
          Stream #0:2[0xeff](spa) : Audio : ac3 ([129][0][0][0] / 0x0081), 48000 Hz, mono, fltp, 64 kb/s
  
          Stream #0:3[0xf00] : Data : scte_35
  
          Stream #0:4[0xf01] : Unknown : none (ETV1 / 0x31565445)
  
          Stream #0:5[0xf02] : Unknown : none (ETV1 / 0x31565445)
  
          Stream #0:6[0xf03] : Unknown : none ([192][0][0][0] / 0x00C0)
  With the patch, the PMT is parsed correctly so the streams are
  
  created in the correct order, are associated with "Program 1",
  
  and their codecs are set correctly.
  [1] https://s3.amazonaws.com/tmm1/combined-pmt-tids-split.ts
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/mpegts.c

• FFMPEG Failure - Extracting frames on large file

  25 avril 2018, par Marian Montagnino

  Calling the ffmpeg command :

  ffmpeg -y -ss "00:00:02" -i 5ccaea226acfc1b4b75ccd1a9f09512c.mxf -frames 30 -f image2 -vf "fps=1/1.25,scale='min(420,iw)':-1" video%04d.jpg

  Causes a failure :

  ffmpeg failed: ffmpeg version N-85692-g78a5fc4 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)
  
  configuration: --prefix=/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/include --extra-ldflags=-L/tmp/gm-ffmpeg-1.0.4/BUILD/ffmpeg_build/lib --bindir=/tmp/gm-ffmpeg-1.0.4/BUILDROOT/gm-ffmpeg-1.0.4-1.el7.centos.x86_64/opt/graymeta/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
  libavutil 55. 61.100 / 55. 61.100
  
  libavcodec 57. 93.100 / 57. 93.100
  
  libavformat 57. 72.101 / 57. 72.101
  
  libavdevice 57. 7.100 / 57. 7.100
  
  libavfilter 6. 87.100 / 6. 87.100
  
  libswscale 4. 7.101 / 4. 7.101
  
  libswresample 2. 8.100 / 2. 8.100
  
  libpostproc 54. 6.100 / 54. 6.100
  
  [mxf @ 0x2c6da60] broken or empty index
  
  Input #0, mxf, from '/alloc/5ccaea226acfc1b4b75ccd1a9f09512c.mxf':
  
  Metadata:
  
  uid : 27b07007-2dc8-4305-a78a-81a612d78b94
  
  generation_uid : ef5ae870-4075-4513-ea1f-39c0ed197267
  
  company_name : Colorfront
  
  product_name : Transkoder
  
  product_uid : 3a4fe380-0d01-11e4-869f-3cd92b5c1dfc
  
  product_version : 2.7.3.20150121
  
  application_platform: Microsoft Windows 7 Professional Service Pack 1 (Build 7601)
  
  modification_date: 2016-09-09T11:29:39.000000Z
  
  material_package_umid: 0x060A2B340101010501010F20130000008991E1DCEA584837149E72E7F9F0E09D
  
  timecode : 00:00:17;12
  
  Duration: 00:11:58.92, start: 0.000000, bitrate: 150802 kb/s
  
  Stream #0:0: Video: jpeg2000, yuv422p10le(progressive), 3840x2160, SAR 1:1 DAR 16:9, 59.94 fps, 59.94 tbr, 59.94 tbn, 59.94 tbc
  
  Metadata:
  
  file_package_umid: 0x060A2B340101010501010F2013000000F8B3B48BE8044408DDD6303A6D43F566
  
  track_name : Picture
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (jpeg2000 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  : signal: killed

  I’m not sure how to interpret this error message and why it actually failed. This file is about 90GB large and shot in 4K resolution but 11 seconds long.