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• ffmpeg : concat and encode with one command

  15 mars 2018, par Massimo Vantaggio

  I have a script that automates encode and concat a series of input video files.
  I’m trying to get encode and concat in a single command.

  At the moment it does not work causing immense empty pauses in the final video output.

  I would like to get the result with concat demux instead of concat protocol because it is much harder to automate in a script

  Do you know if it is possible to archive this result with concat demux ?
  Thanks a lot !

  Massimo

  ENCODE / CONCAT 1080p

  for f in ./*.mp4; do echo "file '$f'" >> list.txt; done
  
  
  
  ffmpeg -f concat -safe 0 -y -i list.txt -i ../logo/logo.png -c:a aac -b:a 384k -ar 48000 -ac 2 -af aresample=async=1000 -c:v libx264 -x264opts keyint=50:min-keyint=50:no-scenecut -bf 0 -r 25 -b:v 4800k -maxrate 4800k -bufsize 3000k -profile:v main -crf 22 -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" ../buffer/1080set.mp4

  It seems to add long pause at low frame-rate :

  [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fb03f05e600] Auto-inserting h264_mp4toannexb bitstream filter

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:18:52.56 bitrate=1348.0kbits

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:18:56.57 bitrate=1343.3kbits/

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:19:00.65 bitrate=1338.5kbits/

  frame= 9745 fps= 13 q=27.0 size= 186368kB time=00:19:02.29 bitrate=1336.5kbits/

  More than 1000 frames duplicated

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 2016-02-27T22:25:49.000000Z
  
      encoder         : HandBrake 0.10.5 2016021100
  
    Duration: 00:06:29.87, start: 0.000000, bitrate: 3447 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 768x432, 3282 kb/s, 25 fps, 25 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T22:25:49.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 159 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T22:25:49.000000Z
  
        handler_name    : Stereo
  
  
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '2.mp4':
  
    Metadata:
  
      major_brand     : M4V 
  
      minor_version   : 1
  
      compatible_brands: M4V mp42isom
  
      creation_time   : 2016-02-27T18:52:37.000000Z
  
    Duration: 00:07:16.93, start: 0.000000, bitrate: 1184 kb/s
  
      Stream #1:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 991 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T18:52:37.000000Z
  
        handler_name    : Mainconcept MP4 Video Media Handler
  
        encoder         : AVC Coding
  
      Stream #1:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
  
      Metadata:
  
        creation_time   : 2016-02-27T18:52:37.000000Z
  
        handler_name    : Mainconcept MP4 Sound Media Handler
  
  
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from '3.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2017-06-27T17:58:17.000000Z
  
    Duration: 00:05:05.05, start: 0.000000, bitrate: 2622 kb/s
  
      Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 2301 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:58:17.000000Z
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:58:17.000000Z
  
        handler_name    : Alias Data Handler
  
  
  
  Input #3, mov,mp4,m4a,3gp,3g2,mj2, from '4.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: mp42mp41
  
      creation_time   : 2017-06-27T17:53:32.000000Z
  
    Duration: 00:06:47.36, start: 0.000000, bitrate: 3144 kb/s
  
      Stream #3:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, smpte170m), 768x432, 2819 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:53:32.000000Z
  
        handler_name    : Alias Data Handler
  
        encoder         : AVC Coding
  
      Stream #3:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
  
      Metadata:
  
        creation_time   : 2017-06-27T17:53:32.000000Z
  
        handler_name    : Alias Data Handler

• Compressing a Video for HLS Streaming

  12 mars 2018, par jAndy

  I’m in the situation where I have a source file (very high quality, direct output from FCPX) which is in 1080p resolution.

  I use ffmpeg to create a 240, 360, 480 and 720 version to have an adaptive stream quality via HLS, so far so good. My question is about the strategy I’m using.
  Right now, I always use the original file as input for ffmpeg. I was wondering if it wouldn’t be a better idea to convert from 1080 to 720 with full compression algorithms and after that, just re-scale from 720 to 480, 360 and 240.

  I’m not really into video compression and ffmpeg, so I’d just like to hear some expert opinions on this approach. Is there any advantage to always go "all the way" (original file -> compressed/rescaled file) ?

• FFMPEG convert and codec

  11 mars 2018, par RonaldoLanhellas

  I have a CENTOS and i installed ffmpeg with : yum install ffmpeg command

  I’m trying to converting a video with the following command :

  ffmpeg -y -i "C:\home\app\cedoc\convert\TREINO_PSC_ACD_PR_02_09_14_IMAGEM_GOROTO_PRESO.MXF" -crf 18.0 -vcodec libx264 -filter:v scale=1920:1080 -preset veryslow -acodec libvo_aacenc -ar 48000 -b:a 192k -coder 1 -flags +loop -cmp chroma -partitions +parti4x4+partp8x8+partb8x8 -me_method hex -subq 6 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -threads 0 "C:\Users\lanhellas\Documents\TREINO_PSC_ACD_PR_02_09_14_IMAGEM_GOROTO_PRESO.mp4"

  But i got the following :

  Unknown encoder 'libvo_aacenc'

  This is my ffmpeg configuration :

  ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)
  
    configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfaac --enable-nonfree --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
  
    libavutil      54. 20.100 / 54. 20.100
  
    libavcodec     56. 26.100 / 56. 26.100
  
    libavformat    56. 25.101 / 56. 25.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 11.102 /  5. 11.102
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Hyper fast Audio and Video encoder
  
  usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...