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• FFMpeg is dropping video track when clipping an mpg video

  16 juin 2017, par M. Grishaber

  I am extracting a clip from an mpg video using the following command.
  ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t 00:00:03.200 -c copy out_271b.mpg

  I am using the copy parameter to avoid reencoding the clip.
  The resulting mpg file only has the audio track, no video.
  The following is the FFMpeg screen dump.

  C:\ffmpeg-20170615\bin>ffmpeg.exe -i 271b.mpg -ss 00:00:05.000 -t 00:00:03.200 -c copy out_271b.mpg
  
      ffmpeg version N-86482-gbc40674 Copyright (c) 2000-2017 the FFmpeg developers
  
        built with gcc 7.1.0 (GCC)
  
        configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
        libavutil      55. 66.100 / 55. 66.100
  
        libavcodec     57. 99.100 / 57. 99.100
  
        libavformat    57. 73.100 / 57. 73.100
  
        libavdevice    57.  7.100 / 57.  7.100
  
        libavfilter     6. 92.100 /  6. 92.100
  
        libswscale      4.  7.101 /  4.  7.101
  
        libswresample   2.  8.100 /  2.  8.100
  
        libpostproc    54.  6.100 / 54.  6.100
  
      Input #0, mpeg, from '271b.mpg':
  
        Duration: 00:01:11.44, start: 0.460000, bitrate: 2154 kb/s
  
          Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], 2000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
          Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      [mpeg @ 0000000000666aa0] VBV buffer size not set, using default size of 130KB
  
      If you want the mpeg file to be compliant to some specification
  
      Like DVD, VCD or others, make sure you set the correct buffer size
  
      Output #0, mpeg, to 'out_271b.mpg':
  
        Metadata:
  
          encoder         : Lavf57.73.100
  
          Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, bt470bg, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 2000 kb/s, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
          Stream #0:1: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      Stream mapping:
  
        Stream #0:0 -> #0:0 (copy)
  
        Stream #0:1 -> #0:1 (copy)
  
      Press [q] to stop, [?] for help
  
      frame=   74 fps=0.0 q=-1.0 Lsize=     786kB time=00:00:03.17 bitrate=2027.2kbits/s speed= 198x
  
      video:730kB audio:50kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.843343%

  Thanks

  Addition : I tried to open the generated clip file with ffplay and got the following results. Note that ffplay was able to open and play the original mpg file.

  ffplay.exe out_271b.mpg
  
  ffplay version N-86482-gbc40674 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 66.100 / 55. 66.100
  
    libavcodec     57. 99.100 / 57. 99.100
  
    libavformat    57. 73.100 / 57. 73.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 92.100 /  6. 92.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  [mpeg @ 00000000023cde80] probed stream 2 failedB sq=    0B f=0/0
  
  [mpeg @ 00000000023cde80] start time for stream 0 is not set in estimate_timings_from_pts
  
  [mpeg @ 00000000023cde80] Could not find codec parameters for stream 2 (Video: none, none): unknown codec
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpeg, from 'out_271bb.mpg':
  
    Duration: 00:00:03.22, start: 0.500000, bitrate: 2068 kb/s
  
      Stream #0:0[0x1bf]: Data: dvd_nav_packet  0KB sq=    0B f=0/0
  
      Stream #0:1[0x1c0]: Audio: mp2, 44100 Hz, mono, s16p, 128 kb/s
  
      Stream #0:2[0x1e0]: Video: none, none, 25 fps, 25 tbr, 90k tbn
  
  SDL_OpenAudio (1 channels, 44100 Hz): DirectSoundCreate: No audio device found
  
  No more combinations to try, audio open failed
  
  No codec could be found with id 0
  
  Failed to open file 'out_271b.mpg' or configure filtergraph

• A ffmpeg comman canwork in cmd but not in Python using subprocess.call() or os.system()

  6 juin 2018, par Starrysky

  I wanna transfer a .mp3 to .wav. This is my command :
  ffmpeg -i a.mp3 -ar 16000 -ac 1 -acodec pcm_s16le a.wav

  It worked well in cmd

  C:\Users\starrysky\Documents\GitHub\bing_pic\html>ffmpeg -i a.mp3 -ar 16000 -ac 1 -acodec pcm_s16le a.wav
  
  ffmpeg version N-86482-gbc40674 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.1.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 66.100 / 55. 66.100
  
    libavcodec     57. 99.100 / 57. 99.100
  
    libavformat    57. 73.100 / 57. 73.100
  
    libavdevice    57.  7.100 / 57.  7.100
  
    libavfilter     6. 92.100 /  6. 92.100
  
    libswscale      4.  7.101 /  4.  7.101
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, mp3, from 'a.mp3':
  
    Metadata:
  
      encoder         : Lavf54.6.100
  
    Duration: 00:00:01.87, start: 0.000000, bitrate: 8 kb/s
  
      Stream #0:0: Audio: mp3, 8000 Hz, mono, s16p, 8 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mp3 (native) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, wav, to 'a.wav':
  
    Metadata:
  
      ISFT            : Lavf57.73.100
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 16000 Hz, mono, s16, 256 kb/s
  
      Metadata:
  
        encoder         : Lavc57.99.100 pcm_s16le
  
  size=      59kB time=00:00:01.87 bitrate= 256.3kbits/s speed= 187x
  
  video:0kB audio:58kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.130208%

  but when I moved it into my python program, something strange happened.

  >>> C:\Users\starrysky\Documents\GitHub\bing_pic\html\
  
  'ffmpeg' �����ڲ����ⲿ���Ҳ���ǿ����еij���
  
  ���������ļ���
  
  1 Command 'ffmpeg -i a.mp3 -ar 16000 -ac 1 -acodec pcm_s16le a.wav' returned non-zero exit status 1.
  
  文件错误啊，亲
  
  [WinError 2] 系统找不到指定的文件。: 'a.wav'

  This is part of my python code :

  @bot.register(wife, RECORDING)
  
  def translate_sound(msg):
  
      msg.get_file(save_path='a.mp3')
  
      path = os.path.abspath('.')+'\\'
  
      print(path)
  
      try:
  
          subprocess.check_call('ffmpeg -i a.mp3 -ar 16000 -ac 1 -acodec pcm_s16le a.wav', shell=True)
  
          # ''
  
      except Exception as e:
  
          print(1, e)
  
      wav_to_text('a.wav')
  
      try:
  
          os.remove('a.wav')
  
      except Exception as e:
  
          print(e)

  ---

  # 调用百度语音识别API
  
  def get_token():
  
      URL = 'http://openapi.baidu.com/oauth/2.0/token'
  
      _params = urllib.parse.urlencode({'grant_type': b'client_credentials',
  
                                        'client_id': b''
  
                                        'client_secret': b''})
  
      _res = urllib.request.Request(URL, _params.encode())
  
      _response = urllib.request.urlopen(_res)
  
      _data = _response.read()
  
      _data = json.loads(_data)
  
      return _data['access_token']
  
  
  
  
  
  def wav_to_text(wav_file):
  
      try:
  
          wav_file = open(wav_file, 'rb')
  
      except IOError:
  
          print('文件错误啊，亲')
  
          return
  
      wav_file = wave.open(wav_file)
  
      n_frames = wav_file.getnframes()
  
      print('n_frames ', n_frames)
  
      frame_rate = wav_file.getframerate()
  
      print("frame_rate ", frame_rate)
  
      if n_frames == 1 or frame_rate not in (8000, 16000):
  
          print('不符合格式')
  
          return
  
      audio = wav_file.readframes(n_frames)
  
      seconds = n_frames/frame_rate+1
  
      minute = int(seconds/60 + 1)
  
      for i in range(0, minute):
  
          sub_audio = audio[i*60*frame_rate:(i+1)*60*frame_rate]
  
          base_data = base64.b64encode(sub_audio)
  
          data = {"format": "wav",
  
                  "token": get_token(),
  
                  "len": len(sub_audio),
  
                  "rate": frame_rate,
  
                  "speech": base_data.decode(),
  
                  "cuid": "B8-AC-6F-2D-7A-94",
  
                  "channel": 1}
  
          data = json.dumps(data)
  
          res = urllib.request.Request('http://vop.baidu.com/server_api',
  
                                data.encode(),
  
                                {'content-type': 'application/json'})
  
          response = urllib.request.urlopen(res)
  
          res_data = json.loads(response.read())
  
          try:
  
              print(res_data['result'][0])
  
          except Exception as e:
  
              print(e)

  What happened ?

• ffmpeg : aspect ratio of image in a slideshow

  26 juin 2020, par worov

  I have a bunch of images PNG files. I'm trying to make a slideshow with these using ffmpeg. The images are 3000*4000. These images don't have all the same aspect ratio.

  



  Some are like these :

  



  

  



  Some are like this :

  



  

  



  I used the command :

  



  ffmpeg -loop 1 -framerate 1/10 -i img%3d.png -i audio.wav -vf scale=w=3840:h=-1 -vcodec libx264 -crf 14 -r 60 -pix_fmt yuv420p -shortest output.mp4


  



  It returns me this :

  



     ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, image2, from 'img%3d.png':
  Duration: 00:02:30.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 4000x3000 [SAR 7087:7087 DAR 4:3], 0.10 tbr, 0.10 tbn, 0.10 tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from 'audio.wav':
  Duration: 01:54:44.14, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x55c1be935420] using SAR=1/1
[libx264 @ 0x55c1be935420] frame MB size (240x180) > level limit (36864)
[libx264 @ 0x55c1be935420] MB rate (2592000) > level limit (2073600)
[libx264 @ 0x55c1be935420] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x55c1be935420] profile High, level 5.2
[libx264 @ 0x55c1be935420] 264 - core 150 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - 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=6 lookahead_threads=1 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=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=14.0 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         : Lavf57.71.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p(progressive), 3840x2880 [SAR 1:1 DAR 4:3], q=-1--1, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc57.89.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc57.89.100 aac
[image2 @ 0x55c1be8edde0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
More than 1000 frames duplicated    5309kB time=00:00:09.13 bitrate=4762.0kbits/s dup=599 drop=0 speed=0.164x   
More than 10000 frames duplicated 137722kB time=00:02:39.13 bitrate=7089.8kbits/s dup=9584 drop=0 speed=0.174x   
More than 100000 frames duplicated429964kB time=00:27:39.13 bitrate=7060.5kbits/s dup=99434 drop=0 speed=0.173x   
frame=413401 fps= 10 q=-1.0 Lsize= 5962186kB time=01:54:49.96 bitrate=7088.9kbits/s dup=413310 drop=0 speed=0.173x   
video:5831116kB audio:117825kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.222641%
[libx264 @ 0x55c1be935420] frame I:2068  Avg QP: 6.65  size:2816521
[libx264 @ 0x55c1be935420] frame P:104040 Avg QP:10.85  size:   470
[libx264 @ 0x55c1be935420] frame B:307293 Avg QP:16.51  size:   318
[libx264 @ 0x55c1be935420] consecutive B-frames:  0.8%  0.0%  0.5% 98.7%
[libx264 @ 0x55c1be935420] mb I  I16..4:  7.3% 54.6% 38.1%
[libx264 @ 0x55c1be935420] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:99.8%
[libx264 @ 0x55c1be935420] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:49.5% L1:50.5% BI: 0.0%
[libx264 @ 0x55c1be935420] 8x8 transform intra:54.6% inter:97.9%
[libx264 @ 0x55c1be935420] coded y,uvDC,uvAC intra: 98.2% 92.7% 92.2% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x55c1be935420] i16 v,h,dc,p: 17% 12% 36% 35%
[libx264 @ 0x55c1be935420] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 26% 13%  5%  6%  6%  9%  6% 11%
[libx264 @ 0x55c1be935420] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 24% 11%  7%  9%  7% 10%  7% 11%
[libx264 @ 0x55c1be935420] i8c dc,h,v,p: 40% 33% 18% 10%
[libx264 @ 0x55c1be935420] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x55c1be935420] ref P L0: 99.6%  0.0%  0.4%  0.0%
[libx264 @ 0x55c1be935420] ref B L0: 21.9% 78.1%  0.0%
[libx264 @ 0x55c1be935420] ref B L1: 99.5%  0.5%
[libx264 @ 0x55c1be935420] kb/s:6933.00
[aac @ 0x55c1be938aa0] Qavg: 640.546


  



  But the second image is distorted in the video (I can't show you because I don't have enough reputation to post more links).

  



  So I would like to preserve the aspect ratio of each picture : the images shouldn't be distorted. What command should I use for this ?

  



  Thanks in advance.