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• How to use ffmpeg to merge multiple .mp4 files ? (same encoder, simple merge will work)

  6 août 2019, par Mars Robertson

  I’m trying :

  • How to concatenate two MP4 files using FFmpeg ?
  • https://superuser.com/questions/1059245/ffmpeg-join-two-mp4-files-with-ffmpeg-on-command-line

  ---

  Option A :

  ffmpeg -f concat -i list.txt -c copy output

  Line 1 : unknown keyword ’file’
  list.txt : Invalid data found when processing input

  cat list.txt
file './001-eclipse.mp4'
file './002-sundown.mp4'
file './003-robothear.mp4'
file './004-NOPE-boring-tower.mp4'

  Option B :

  ffmpeg -i "concat:001-eclipse.mp4|002-sundown.mp4|003-robothear.mp4|004-NOPE-boring-tower.mp4" -c copy output.mp4

  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
 built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
 configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
 libavutil      56. 14.100 / 56. 14.100
 libavcodec     58. 18.100 / 58. 18.100
 libavformat    58. 12.100 / 58. 12.100
 libavdevice    58.  3.100 / 58.  3.100
 libavfilter     7. 16.100 /  7. 16.100
 libavresample   4.  0.  0 /  4.  0.  0
 libswscale      5.  1.100 /  5.  1.100
 libswresample   3.  1.100 /  3.  1.100
 libpostproc    55.  1.100 / 55.  1.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7feb1d001200] Found duplicated MOOV Atom. Skipped it
   Last message repeated 2 times
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'concat:001-eclipse.mp4|002-sundown.mp4|003-robothear.mp4|004-NOPE-boring-tower.mp4':
 Metadata:
   encoder         : Lavf58.12.100
   major_brand     : isom
   minor_version   : 512
   compatible_brands: isomiso2avc1mp41
 Duration: 00:00:13.64, start: 0.000000, bitrate: 161885 kb/s
   Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 5376x2688, 54015 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Output #0, mp4, to 'output.mp4':
 Metadata:
   compatible_brands: isomiso2avc1mp41
   major_brand     : isom
   minor_version   : 512
   encoder         : Lavf58.12.100
   Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 5376x2688, q=2-31, 54015 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)
   Metadata:
     handler_name    : VideoHandler
Stream mapping:
 Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame=  341 fps=0.0 q=-1.0 Lsize=   89943kB time=00:00:13.52 bitrate=54497.5kbits/s speed=90.2x
video:89937kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005972%

  It contains only the first video :/

  ---

  Any ideas ?

  My version on Mac :

  ffmpeg -version
ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.1.0 (clang-902.0.39.2)
configuration: --prefix=/usr/local/Cellar/ffmpeg/4.0.2 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-gpl --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --enable-videotoolbox --disable-lzma
libavutil      56. 14.100 / 56. 14.100
libavcodec     58. 18.100 / 58. 18.100
libavformat    58. 12.100 / 58. 12.100
libavdevice    58.  3.100 / 58.  3.100
libavfilter     7. 16.100 /  7. 16.100
libavresample   4.  0.  0 /  4.  0.  0
libswscale      5.  1.100 /  5.  1.100
libswresample   3.  1.100 /  3.  1.100
libpostproc    55.  1.100 / 55.  1.100

• FFMPEG - Store FFPROBE's duration output as a variable

  12 août 2023, par user7032056

  I wanted to use a video's duration in the "enable='between(t,0,0)" field to make sure that I overlay an image at 1/3 of the video's duration every time.

  



  According to FFMPEG's info on their site, I need to use this

  



  ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 input.mp4


  



  it does return a value but I can't seem to be able to set it to a usable variable, I already tried by using

  



  set duration=ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 input.mp4


  



  And then referencing it via %duration%, but no luck.

  



  Is there a way to do this, am I doing something wrong ?

  



  Thank you for your help.

  


• create associative data from ffmpeg string result into python

  9 septembre 2018, par Question

  To perform video operations I’m using python with the support of ffmpeg. After I’ve uploaded videos, I need to resize them, so I’ll follow these instructions to calculate the video dimensions :

  link_v = "C:/video/video.mp4"
  
  ffmpeg = "ffprobe -v error -show_entries stream=width,height -of default=noprint_wrappers=1 %s"% link_v
  
  info = check_output(ffmpeg, shell=True)
  
  print(info)

  The console result is something like this :

  width=350
  
  height=350

  But I do not care about this, when it is printed as if it were a string, because the real data would be : b’width=350\r\nheight=350\r\n’ or [’width=350\r\nheight=350\r\n’].

  What I really want to see is an associative data : "width : 350, height : 350", once I get then I would call for example width in the info mode [’width’], how can I get this result ?