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• Video not clear when concatinate videos thogther using ffmpeg

  5 février 2018, par no name

  I have 3 types of the video first is start video played when the video start, the main video which is the main content of the video and last is the end video I want to add them together they have different resolutions so I use a text file to write the videos name like this.

  file start.mp4
  
  file main.mp4
  
  file end.mp4

  then I use this command with FFmpeg

  FFmpeg -f concat -i ffmpeg-sound.txt -c copy final_output.mp4

  the problem is when I start watching the video the first video image is appearing in all the video duration I tried different player every one shows me a crashed photo but the sound is working fine.
  also, the main video is created from mp3 file and image with subtitle it’s not original or downloaded from anywhere and I want to concatenate them.
  what i tried when i make some searches and i thought it’s the problem that they have different resolution so i tried this command on both 3 videos to make them have the same resolution so no problem show after the concatenate
  

  FFmpeg -y -i end.mp4 -c copy -bsf:v h264_mp4toannexb -f mpegts end.mp4.ts

  and try to add the 3 files again with ts formate and the same problem shown too so please any help to solve this
  Update
  i tried to use this command to change all the three videos to 1280x720

  FFmpeg -i a.mp4 -vf scale=1280:720 a1.mp4

  after testing the problem exactly i found that the first video only works then when it go to next video to show it, the screen is a freeze on the last image from the first video. I don’t know why this problem even after i make them same scale !
  here is the output of

  ffmpeg -i start.mp4 -i a.mp4 -i end.mp4

  output this before edit all the videos resulution to 1280x720

      ffmpeg version N-89940-gb1af0e23a3 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    libavutil      56.  7.100 / 56.  7.100
  
    libavcodec     58.  9.100 / 58.  9.100
  
    libavformat    58.  7.100 / 58.  7.100
  
    libavdevice    58.  0.101 / 58.  0.101
  
    libavfilter     7. 11.101 /  7. 11.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'start.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Tunepro
  
      artist          : Kiran Khan
  
      album_artist    : Kiran Khan
  
      encoder         : Lavf57.83.100
  
      description     : This video is about Tunepro
  
      keywords        : tunepro,new
  
    Duration: 00:00:03.15, start: 0.000000, bitrate: 863 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 729 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'a.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.7.100
  
    Duration: 00:05:21.24, start: 0.000000, bitrate: 188 kb/s
  
      Stream #1:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuvj444p(pc), 300x300 [SAR 1:1 DAR 1:1], 53 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #1:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'end.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      title           : Tunepro
  
      artist          : Kiran Khan
  
      album_artist    : Kiran Khan
  
      encoder         : Lavf57.83.100
  
      description     : This video is about Tunepro
  
      keywords        : tunepro,new
  
    Duration: 00:00:30.03, start: 0.000000, bitrate: 8051 kb/s
  
      Stream #2:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 7923 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
  At least one output file must be specified

• How can I convert audio to WAVE_FORMAT_PCM using FFmpeg ?

  12 février 2018, par Eric Stdlib

  I am using Python’s wave module to read audio, and using FFmpeg to convert audio from other types to wav. However, I am encountering some problem.

  I wrote v.py to generate an silence audio file a.wav

  import sys, wave, math
  
  import numpy as np
  
  
  
  wave_data = np.zeros(44100).astype(np.short)
  
  
  
  f = wave.open('a.wav', 'wb')
  
  f.setnchannels(1)
  
  f.setsampwidth(2)
  
  f.setframerate(96000)
  
  f.writeframes(wave_data.tostring())
  
  f.close()

  Then I used FFmpeg to "copy" a.wav to b.wav (though it seems to encode / decode the file), but I can only read a.wav with Python ; b.wav cannot be opened.

  [user@localhost tmp]$ ffmpeg -i a.wav b.wav
  
  Guessed Channel Layout for Input Stream #0.0 : mono
  
  Input #0, wav, from 'a.wav':
  
    Duration: 00:00:00.46, bitrate: 1536 kb/s
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 96000 Hz, mono, s16, 1536 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, wav, to 'b.wav':
  
    Metadata:
  
      ISFT            : Lavf57.71.100
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 96000 Hz, mono, s16, 1536 kb/s
  
      Metadata:
  
        encoder         : Lavc57.89.100 pcm_s16le
  
  size=      86kB time=00:00:00.45 bitrate=1537.8kbits/s speed= 706x    
  
  video:0kB audio:86kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.115646%
  
  [user@localhost tmp]$ python3
  
  Python 3.6.4 (default, Jan 23 2018, 22:25:37) 
  
  [GCC 7.2.1 20170915 (Red Hat 7.2.1-2)] on linux
  
  Type "help", "copyright", "credits" or "license" for more information.
  
  >>> import wave
  
  >>> wave.open('a.wav')
  
  
  
  >>> wave.open('b.wav')
  
  Traceback (most recent call last):
  
    File "<stdin>", line 1, in <module>
  
    File "/usr/lib64/python3.6/wave.py", line 499, in open
  
      return Wave_read(f)
  
    File "/usr/lib64/python3.6/wave.py", line 163, in __init__
  
      self.initfp(f)
  
    File "/usr/lib64/python3.6/wave.py", line 143, in initfp
  
      self._read_fmt_chunk(chunk)
  
    File "/usr/lib64/python3.6/wave.py", line 260, in _read_fmt_chunk
  
      raise Error('unknown format: %r' % (wFormatTag,))
  
  wave.Error: unknown format: 65534
  
  >>> 
  
  </module></stdin>

  How should I change the command of FFmpeg to convert the file to WAVE_FORMAT_PCM, so that I can read b.wav with Python ?

• add subtitle to video created from mp3 file and an image using ffmpeg

  1er février 2018, par no name

  I have a simple image and an mp3 file all I want to do is to add a lyrics to this mp3 file in a video as an output with fade out style.
  so i used this command to do so from this this blog
  

  ffmpeg -loop 1 -y -i test.jpg -i test.mp3 -vf subtitles=”f=test.srt:force_style=’FontName=Arial,FontSize=14″ -shortest test1.mp4

  when i used this command i got this eror

      ffmpeg -loop 1 -y -i test.jpg -i test.mp3 -vf subtitles="f=test.srt:force_style=’FontName=Arial,FontSize=14″ -shortest test1.mp4
  
  ffmpeg version N-89940-gb1af0e23a3 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-amf --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
  
    libavutil      56.  7.100 / 56.  7.100
  
    libavcodec     58.  9.100 / 58.  9.100
  
    libavformat    58.  7.100 / 58.  7.100
  
    libavdevice    58.  0.101 / 58.  0.101
  
    libavfilter     7. 11.101 /  7. 11.101
  
    libswscale      5.  0.101 /  5.  0.101
  
    libswresample   3.  0.101 /  3.  0.101
  
    libpostproc    55.  0.100 / 55.  0.100
  
  Trailing options were found on the commandline.
  
  Input #0, image2, from 'test.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: 17290 kb/s
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 960x959 [SAR 1:1 DAR 960:959], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Input #1, mp3, from 'test.mp3':
  
    Metadata:
  
      comment         : converted by convert2mp3.net
  
      title           : Celestial Empire [ Worlds 2017 ] [ Pick and b
  
      artist          : Raffael Gruber Matthias Ullrich
  
    Duration: 00:02:33.13, start: 0.025057, bitrate: 193 kb/s
  
      Stream #1:0: Audio: mp3, 44100 Hz, stereo, s16p, 192 kb/s
  
      Metadata:
  
        encoder         : Lavc57.28
  
  At least one output file must be specified

  iam using windows 10, last version of ffmpeg, so what makes this problem. also how to make the style of the lyrics to be something like fade in/out and so on. if it’s possible
  Thanks in advance.
  update
  when i use this command

  ffmpeg -loop 1 -y -i test.jpg -i test.mp3 -vf "subtitles=test.srt:force_style='FontName=Arial,FontSize=14'" -shortest test1.mp4

  it give me this error

  Press [q] to stop, [?] for help
  
  [Parsed_subtitles_0 @ 049af980] Shaper: FriBidi 0.19.7 (SIMPLE)
  
  [Parsed_subtitles_0 @ 049af980] Using font provider directwrite
  
  [libx264 @ 049d2440] height not divisible by 2 (960x959)
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

  i searched this error and i found a solution by add this part before output file so the final command is

  ffmpeg -loop 1 -y -i test.jpg -i test.mp3 -vf "subtitles=test.srt:force_style='FontName=Arial,FontSize=14'" -shortest -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" test1.mp4

  i got no error and it worked but the output video not contains any lyrics which i added

  Update
  
  last thing i tried and it works first i use this command to convert the image and mp3 file to a mp4 video

  ffmpeg -loop 1 -i test.jpg -i test.mp3 -shortest -acodec copy -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" video.mp4

  but this command take a long time to process to convert mp3 of 2:55 minute it with image.
  then i start to add lyrics or subtitle using this command

  ffmpeg -i video.mp4 -vf "subtitles=test.srt:force_style='FontName=Arial,FontSize=14,PrimaryColour=&H0000ff&'" -c:a copy output.mp4

  this worked perfect and give the output but it take a long time to process i don’t know if this normal.
  now last thing how can i set the style of the subtitle so it be fade out or something