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• Cannot concatenate videos ffmpeg [on hold]

  1er mai 2014, par Paul Prescod

  I have a bitmap that I would like to concatenate to the front of many videos as a sort of title screen or disclaimer screen.

  I try to turn it into a video with the same attributes as the rest of the video. So first I introspect the video :

  ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 11 2014 22:50:38 with Apple LLVM version 5.1 (clang-503.0.40) (based on LLVM 3.4svn)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/2.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  
    libavutil      52. 66.100 / 52. 66.100
  
    libavcodec     55. 52.102 / 55. 52.102
  
    libavformat    55. 33.100 / 55. 33.100
  
    libavdevice    55. 10.100 / 55. 10.100
  
    libavfilter     4.  2.100 /  4.  2.100
  
    libavresample   1.  2.  0 /  1.  2.  0
  
    libswscale      2.  5.102 /  2.  5.102
  
    libswresample   0. 18.100 /  0. 18.100
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'EO1.mp4':
  
    Metadata:
  
  major_brand     : isom
  
  minor_version   : 512
  
  compatible_brands: isomiso2avc1mp41
  
  creation_time   : 1970-01-01 00:00:00
  
  encoder         : Lavf52.78.3
  
    Duration: 00:00:17.77, start: 0.000000, bitrate: 582 kb/s
  
  Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 584x328 [SAR 1:1 DAR 73:41], 512 kb/s, 23.98 fps, 23.98 tbr, 1199 tbn, 47.96 tbc (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : VideoHandler
  
  Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
  
  Metadata:
  
    creation_time   : 1970-01-01 00:00:00
  
    handler_name    : SoundHandler

  Then I try and create a similar file :

  /usr/local/Cellar/ffmpeg/2.2.1/bin/ffmpeg -y -loop 1 -i Disclaimer.png -c:v libx264 -r 23.98 -t 5 -pix_fmt yuv420p -profile:v main disclaimer.mp4

  It seems to work okay. The video plays I would expect it to. The attributes turn out very similar. Here is a diff :

  < Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'disclaimer.mp4':
  
  ---
  
  > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'EO1.mp4':
  
  18,20c18,21
  
  <     encoder         : Lavf55.33.100
  
  <   Duration: 00:00:05.01, start: 0.000000, bitrate: 21 kb/s
  
  <     Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 584x328 [SAR 1:1 DAR 73:41], 17 kb/s, 23.98 fps, 23.98 tbr, 19184 tbn, 47.96 tbc (default)
  
  ---
  
  >     creation_time   : 1970-01-01 00:00:00
  
  >     encoder         : Lavf52.78.3
  
  >   Duration: 00:00:17.77, start: 0.000000, bitrate: 582 kb/s
  
  >     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 584x328 [SAR 1:1 DAR 73:41], 512 kb/s, 23.98 fps, 23.98 tbr, 1199 tbn, 47.96 tbc (default)
  
  21a23
  
  22a25,28
  
  >     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 64 kb/s (default)
  
  >     Metadata:
  
  >       handler_name    : SoundHandler

  But when I try to concatenate, I get errors.

  > $ cat temporary.txt 
  
  
  
      file disclaimer.mp4
  
      file EO1.mp4

  /usr/local/Cellar/ffmpeg/2.2.1/bin/ffmpeg -y -f concat -i temporary.txt -c copy output.mp4

  [concat @ 0x7fd880806600] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, concat, from 'temporary.txt':
  
    Duration: 00:00:00.02, start: 0.000000, bitrate: 17 kb/s
  
  Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 584x328 [SAR 1:1 DAR 73:41], 17 kb/s, 23.98 fps, 23.98 tbr, 19184 tbn, 47.96 tbc
  
  Output #0, mp4, to 'output.mp4':
  
    Metadata:
  
  encoder         : Lavf55.33.100
  
  Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 584x328 [SAR 1:1 DAR 73:41], q=2-31, 17 kb/s, 23.98 fps, 19184 tbn, 19184 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 0x7fd880829a00] Non-monotonous DTS in output stream 0:0; previous: 93600, current: 5951; changing to 93601. This may result in incorrect timestamps in the output file.
  
  [concat @ 0x7fd880806600] Invalid stream index 1
  
  [mp4 @ 0x7fd880829a00] Non-monotonous DTS in output stream 0:0; previous: 93601, current: 6001; changing to 93602. This may result in incorrect timestamps in the output file.
  
  [concat @ 0x7fd880806600] Invalid stream index 1
  
  [mp4 @ 0x7fd880829a00] Non-monotonous DTS in output stream 0:0; previous: 93602, current: 6051; changing to 93603. This may result in incorrect timestamps in the output file.

  ...

  frame=  546 fps=0.0 q=-1.0 Lsize=    1127kB time=00:00:04.90 bitrate=1882.9kbits/s    
  
  video:1123kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead 0.349865%

  The output looks like it only has my disclaimer file in it, not the rest of the video.

  I’m also confused why it feels like it needs to "estimate" anything. It knows the input FPS and input durations. I’m not sure if this is the problem or not. Maybe its just a bug.

• ffmpeg to cut beginning and fade in audio

  31 juillet 2024, par cannyboy

  I've got a bunch of spoken word mp3 files, which all have the same intro talking and music, and then the real content begins. So it goes roughly like this :

  


  00:00 Standard intro spoken word
00:20 Standard intro music
00:35 The content


  


  The timings are not always the same (can vary by 5 secs). So I'd to cut the first 25 seconds and then fade in the next five seconds. And then output the file in the same mp3 format. Is this possible with ffmpeg ?

  


• Dynamically set pitches of an mp3 to the pitches of a sample mp3 using JavaScript

  7 juillet 2023, par Maker of worlds

  I am looking for a way set the pitch and tone of an audio file to the pitch and tone of a reference audio file. I can't seem to find a solution anywhere. an example would be if I used a reference and was some song, and the main audio was me talking, it would sound like my voice is talking along the pitch of the song.

  


  I tried the web Api but couldn't find a good solution.

  


  Thank you in advance !