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• ffmpeg video concate not working when one video is generated from a single image

  16 décembre 2017, par Sid

  what I am doing is generating a video of 5 secs from a single image using FFmpeg.

  for that I'm using the following command:

  -loop 1 -i image.jpg -c:v libx264 -t 5 -pix_fmt yuv420p -crf 25 -s 1280x720 Out.mp4.

  Now I want to concatenate this video with another one.

  I am able to do this for other videos with the following command

  -y -i input1.mp4 -i input2.mp4 -strict experimental -filter_complex [0:v]scale=1280x720,setsar=1:1[v0][1:v]scale=1280x720,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 -ab 48000 -ac 2 -ar 22050 -s 1280x720 -r 30 vcodec mpeg4 -b 2097k output.mp4

  But when I join the video generated from the image, the videos do not join as the second input does not have an audio because it is generated from the image.So is there any way to join these two videos using -filter_complex in FFmpeg?

• decrypt AES-128 encrypted m3u8 TS files with ffmpeg

  16 décembre 2017, par Oli

  i am trying to decrypt a .m3u8 playlist, I followed these steps :

  • create a directory
  • copy the key to a key file, ie my.key, and place it in the dir. Note that keys can be rotated, if the playlist has multiple keys copy all of them to different files.
  • copy all .ts segments to the same dir
  • copy and edit the playlist.m3u8 and use just the filename(s) for the key(s) URI(s) and segments.

  and using this command to decrypt the playlist

  ffmpeg -i playlist.m3u8 -c copy output.ts
  

  but i got this error : Invalid data found when processing input

  here is my m3u8 :

  #EXTM3U
  #EXT-X-TARGETDURATION:12
  #EXT-X-ALLOW-CACHE:YES
  #EXT-X-PLAYLIST-TYPE:VOD
  #EXT-X-KEY:METHOD=AES-128,URI="my.key"
  #EXT-X-VERSION:3
  #EXT-X-MEDIA-SEQUENCE:1
  #EXTINF:6.000,
  s-1-v1-a1.ts
  #EXTINF:6.000,
  s-2-v1-a1.ts
  #EXTINF:6.000,
  s-3-v1-a1.ts
  #EXTINF:12.000,
  s-4-v1-a1.ts
  #EXTINF:12.000,
  s-5-v1-a1.ts
  #EXTINF:6.000,
  s-6-v1-a1.ts
  #EXT-X-ENDLIST
  

  • whats wrong with my command ?
  • how to not convert playlist to one .TS file? i want to decrypt files separtly

• FFmpeg formats list with alpha support

  15 décembre 2017, par user1722669

  I am looking the list of FFmpeg codecs which support the alpha channel. seems that there is no description of codec list with alpha in FFmpeg.

  I am interested only in decoding files with alpha, not for encoding one. Thank you.

• How to convert audio files from mp4 to mp3 using applescript ?

  15 décembre 2017, par MBUST

  Can someone please help me understand how to convert audio files from mp4 to mp3 using AppleScript?

  I have tried scripting VLC or Sound Studio but the commands don't seem to come close to doing that. I downloaded and installed ffmpeg but I don't know the syntax to use.

  I tried something like this with ffmpeg:

   tell application "Finder"
  set CurrentPath to container of (path to me) as alias
  set OriginalFile to CurrentPath & "ASProcessing:SoundToProcess.mp4" as string
  set NewFile to CurrentPath & "ASProcessing:NewFile.mp3" as string
  
  end tell
  
  
   set outputFile to POSIX path of OriginalFile
   set inputFile to POSIX path of NewFile
   do shell script ffmpeg something, something
  

  But clearly I'm missing most of the script syntax. Eventually, I would do a repeat loop to go through a set of files.

  Sorry that I can't be more specific. I'm pretty lost with this. What I do know is that I do not want to use Automator. I need something like AppleScript.

  Thanks.

  mbust

• ffmpeg filters image processing

  15 décembre 2017, par Ja_cpp

  ffmpeg is applying some filters to the images before constructing the video. Is there any way to know those filters?

  I'm using this command (so every parameters are kept by default):

  ffmpeg -framerate 12 -i frame%02d.jpg out.mp4
  

  Example of one frame:

  Image file:

  

  From the video:

  I'm working on image processing with c++ and I'm interested in the way ffmpeg filtering the images

  EDIT

  When I launch the command line, that what I get in the terminal:

  ffmpeg -framerate 5 -i frame%02d.jpg output.mp4
  
  
  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
    libavutil      54. 31.100 / 54. 31.100
    libavcodec     56. 60.100 / 56. 60.100
    libavformat    56. 40.101 / 56. 40.101
    libavdevice    56.  4.100 / 56.  4.100
    libavfilter     5. 40.101 /  5. 40.101
    libavresample   2.  1.  0 /  2.  1.  0
    libswscale      3.  1.101 /  3.  1.101
    libswresample   1.  2.101 /  1.  2.101
    libpostproc    53.  3.100 / 53.  3.100
  [mjpeg @ 0x23e8600] Changeing bps to 8
  Input #0, image2, from 'frame%02d.jpg':
    Duration: 00:01:40.20, start: 0.000000, bitrate: N/A
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 2576x1456 [SAR 1:1 DAR 23:13], 5 fps, 5 tbr, 5 tbn, 5 tbc
  No pixel format specified, yuvj420p for H.264 encoding chosen.
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  [libx264 @ 0x23ec680] using SAR=1/1
  [libx264 @ 0x23ec680] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  [libx264 @ 0x23ec680] profile High, level 5.0
  [libx264 @ 0x23ec680] 264 - core 148 r2643 5c65704 - H.264/MPEG-4 AVC codec - Copyleft 2003-2015 - 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=-2 threads=12 lookahead_threads=2 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=5 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, mp4, to 'output.mp4':
    Metadata:
      encoder         : Lavf56.40.101
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuvj420p(pc), 2576x1456 [SAR 1:1 DAR 23:13], q=-1--1, 5 fps, 10240 tbn, 5 tbc
      Metadata:
        encoder         : Lavc56.60.100 libx264
  Stream mapping:
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
  Press [q] to stop, [?] for help
  frame=  501 fps=3.8 q=-1.0 Lsize=  154288kB time=00:01:39.80 bitrate=12664.6kbits/s    
  video:154284kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.002771%
  [libx264 @ 0x23ec680] frame I:3     Avg QP:17.31  size:564506
  [libx264 @ 0x23ec680] frame P:498   Avg QP:19.27  size:313841
  [libx264 @ 0x23ec680] mb I  I16..4:  0.2% 97.1%  2.7%
  [libx264 @ 0x23ec680] mb P  I16..4:  0.0% 46.3%  0.5%  P16..4: 12.5% 13.0%  7.7%  0.0%  0.0%    skip:20.1%
  [libx264 @ 0x23ec680] 8x8 transform intra:98.9% inter:73.3%
  [libx264 @ 0x23ec680] coded y,uvDC,uvAC intra: 99.0% 99.7% 96.0% inter: 52.0% 57.7% 37.0%
  [libx264 @ 0x23ec680] i16 v,h,dc,p: 17% 16% 13% 54%
  [libx264 @ 0x23ec680] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 10% 12% 33%  6%  7%  6%  8%  7% 10%
  [libx264 @ 0x23ec680] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 13% 14% 10% 13%  9% 11%  8% 10%
  [libx264 @ 0x23ec680] i8c dc,h,v,p: 66% 14% 14%  5%
  [libx264 @ 0x23ec680] Weighted P-Frames: Y:2.0% UV:1.2%
  [libx264 @ 0x23ec680] ref P L0: 45.6% 16.0% 20.4% 17.6%  0.5%
  [libx264 @ 0x23ec680] kb/s:12613.66