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    5 septembre 2013, par

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    21 juin 2013, par

    MediaSPIP 0.2 est la première version de MediaSPIP stable.
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    12 avril 2011, par

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Sur d’autres sites (10804)

  • 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 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

  • ffmpeg concatenate videos keeping data stream

    27 juin 2017, par jabal

    I have 2 video segments where each of them has an AMF data stream embedded.

    ffprobe segment_360p.mp4
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'segment_360p.mp4':
    
  Metadata:
    
    **major_brand     : f4v**
    
    minor_version   : 0
    
    compatible_brands: isommp42m4v
    
    creation_time   : 2017-06-26 19:16:08
    
  Duration: 00:01:14.23, start: 0.000000, bitrate: 1055 kb/s
    
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 640x360 [SAR 1:1 DAR 16:9], 933 kb/s, 29.76 fps, 29.97 tbr, 90k tbn, 59.94 tbc (defa
    
lt)
    
    Metadata:
    
      creation_time   : 2017-06-26 19:16:08
    
      handler_name    : WowzaStreamingEngine
    
      encoder         : WowzaStreamingEngine
    
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 116 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-06-26 19:16:08
    
      handler_name    : WowzaStreamingEngine
    
    Stream #0:2(eng): Data: none (amf0 / 0x30666D61), 0 kb/s (default)
    
    Metadata:
    
      creation_time   : 2017-06-26 19:16:08
    
      handler_name    : WowzaStreamingEngine

    I am using ffmpeg to concatenate two such videos with the -f concat filter (ffmpeg -f concat -i mylist.txt -c copy output.mp4) Unfortunately in the output stream this data stream is completely lost :

    ffprobe output.mp4
    
  libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
    
  Metadata:
    
    **major_brand     : isom**
    
    minor_version   : 512
    
    compatible_brands: isomiso2avc1mp41
    
    encoder         : Lavf56.16.102
    
  Duration: 00:03:38.93, start: 0.000000, bitrate: 1032 kb/s
    
    Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 640x360 [SAR 1:1 DAR 16:9], 903 kb/s, 29.50 fps, 29.97 tbr, 90k tbn, 59.94 tbc (defau
    
lt)
    
    Metadata:
    
      handler_name    : VideoHandler
    
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 120 kb/s (default)
    
    Metadata:
    
      handler_name    : SoundHandler

    While looking at the output, I noticed that the "major_brand" changed from f4v to isom, not sure if that is related or not.

    How can I preserve the data stream while concatenating videos ?

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