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• 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 failed to call avcodec_send_packet

  23 juin 2017, par Gizak

  Windows 10 x64,
  ffmpeg : 3.1, prebuilt dlls

  Absolute beginner here.

  I was trying out a very basic case to decode frames from a video file but desperately failed at every attempts. The final code snippet looks like this :

  #define __STDC_CONSTANT_MACROS
  
  extern "C" {
  
  #include<libavutil></libavutil>avutil.h>
  
  #include<libavutil></libavutil>imgutils.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  }
  
  
  
  #include <iostream>
  
  
  
  
  
  int main(int argc, char **argv) {
  
      AVFormatContext* ctx_format = nullptr;
  
      AVCodecContext* ctx_codec = nullptr;
  
      AVCodec* codec = nullptr;
  
      AVFrame* frame = av_frame_alloc();
  
      int stream_idx;
  
      SwsContext* ctx_sws = nullptr;
  
      const char* fin = argv[1];
  
      AVStream *vid_stream = nullptr;
  
      AVPacket* pkt = av_packet_alloc();
  
  
  
      av_register_all();
  
  
  
      if (int ret = avformat_open_input(&amp;ctx_format, fin, nullptr, nullptr) != 0) {
  
          std::cout &lt;&lt; 1 &lt;&lt; std::endl;
  
          return ret;
  
      }
  
      if (avformat_find_stream_info(ctx_format, nullptr) &lt; 0) {
  
          std::cout &lt;&lt; 2 &lt;&lt; std::endl;
  
          return -1; // Couldn't find stream information
  
      }
  
      av_dump_format(ctx_format, 0, fin, false);
  
  
  
      for (int i = 0; i &lt; ctx_format->nb_streams; i++)
  
          if (ctx_format->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
  
              stream_idx = i;
  
              vid_stream = ctx_format->streams[i];
  
              break;
  
      }
  
      if (vid_stream == nullptr) {
  
          std::cout &lt;&lt; 4 &lt;&lt; std::endl;
  
          return -1;
  
      }
  
  
  
      codec = avcodec_find_decoder(vid_stream->codecpar->codec_id);
  
      if (!codec) {
  
          fprintf(stderr, "codec not found\n");
  
          exit(1);
  
      }
  
      ctx_codec = avcodec_alloc_context3(codec);
  
  
  
      if(avcodec_parameters_to_context(ctx_codec, vid_stream->codecpar)&lt;0)
  
          std::cout &lt;&lt; 512;
  
      if (avcodec_open2(ctx_codec, codec, nullptr)&lt;0) {
  
          std::cout &lt;&lt; 5;
  
          return -1;
  
      }
  
  
  
      //av_new_packet(pkt, pic_size);
  
  
  
      while(av_read_frame(ctx_format, pkt) >= 0){
  
          int ret = avcodec_send_packet(ctx_codec, pkt);
  
          if (ret &lt; 0 || ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
  
              std::cout &lt;&lt; "avcodec_send_packet: " &lt;&lt; ret &lt;&lt; std::endl;
  
              break;
  
          }
  
          if (pkt->stream_index == stream_idx) {
  
              while (ret  >= 0) {
  
                  ret = avcodec_receive_frame(ctx_codec, frame);
  
                  if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
  
                      //std::cout &lt;&lt; "avcodec_receive_frame: " &lt;&lt; ret &lt;&lt; std::endl;
  
                      break;
  
                  }
  
                  std::cout &lt;&lt; "frame: " &lt;&lt; ctx_codec->frame_number &lt;&lt; std::endl;
  
              }
  
          }
  
          av_packet_unref(pkt);
  
      }
  
  
  
      avformat_close_input(&amp;ctx_format);
  
      av_packet_unref(pkt);
  
      avcodec_free_context(&amp;ctx_codec);
  
      avformat_free_context(ctx_format);
  
      return 0;
  
  }
  
  </iostream>

  It basically leaves everything by its defaults and try to read packets and decode frames from them. The avcodec_send_packet always returned a negative value at the first or second round of calling in the while loop.

  Output for flv :

  > .\streamer_test.exe .\SampleVideo_360x240_5mb.flv
  
  Input #0, flv, from '.\SampleVideo_360x240_5mb.flv':
  
    Metadata:
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:53.32, start: 0.000000, bitrate: 787 kb/s
  
      Stream #0:0: Audio: aac (LC), 48000 Hz, 5.1, fltp, 384 kb/s
  
      Stream #0:1: Video: flv1, yuv420p, 320x240, 500 kb/s, 1k fps, 25 tbr, 1k tbn
  
  frame: 1
  
  [flv @ 000001545edb66c0] Bad picture start code
  
  [flv @ 000001545edb66c0] header damaged
  
  avcodec_send_packet: -1094995529

  Output for mp4 :

  > .\streamer_test.exe .\SampleVideo_360x240_10mb.mp4
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\SampleVideo_360x240_10mb.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01T00:00:00.000000Z
  
      encoder         : Lavf53.24.2
  
    Duration: 00:02:05.95, start: 0.000000, bitrate: 669 kb/s
  
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 320x240 [SAR 1:1 DAR 4:3], 282 kb/s, 15 fps, 15 t
  
  br, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01T00:00:00.000000Z
  
        handler_name    : SoundHandler
  
  [h264 @ 000002e2446a6cc0] Invalid NAL unit size (17191968 > 1007).
  
  [h264 @ 000002e2446a6cc0] Error splitting the input into NAL units.
  
  avcodec_send_packet: -1094995529

  Output for mkv :

  > .\streamer_test.exe .\SampleVideo_1280x720_2mb.mkv
  
  Input #0, matroska,webm, from '.\SampleVideo_1280x720_2mb.mkv':
  
    Metadata:
  
      ENCODER         : Lavf53.24.2
  
    Duration: 00:00:10.65, bitrate: 1575 kb/s
  
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 1k tbn, 25 tbc (de
  
  fault)
  
      Stream #0:1: Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
  
  frame: 1
  
  [mpeg4 @ 000001166798ede0] header damaged
  
  avcodec_send_packet: -1

  So I guess there must be something wrong around avcodec_send_packet call but could not figured out what is missing. Any ideas about the causes ? Much appreciate your help !

• FFmpeg (Thumbnail from video) works in command line, but not in PHP script

  25 juin 2017, par Jun Kim

  I looked at the similar questions, and the solutions there do not work in my case. Anyone has any idea ? I am trying to capture a thumbnail from a given video file.

  Later, my goal is to capture a thumbnail from live streaming video file.

  Below is my current set up.

  Linux Ubuntu 16.04

  PHP version 7.0

  Nginx Version 1.10.3

  FFmpeg Version FFmpeg 2.8.11

  I installed FFmpeg through below commands in my Ubuntu server.

  apt-get update
  
  apt-get install ffmpeg

  When I type the below command line in the terminal, it does the conversion fine.

  ffmpeg -i /etc/nginx/html/test.mp4 -ss 00:00:01 -vframes 1 -vf scale=240:120 /etc/nginx/html/Share/ffmpeg/thumbnails/test.png;

  In order to use it in php file, I confirmed the location of ffmpeg binaries by I typing in the terminal, which ffmpeg, and it returns /usr/bin/ffmpeg

  I also gave permission to the directory by using chmod 755 command line.

  Here is what I have in my ffmpeg.php file.
  I included the full path to my ffmpeg as you can see.

  <?php
  
  header("Content-Type: text/html;charset=UTF-8");
  
  
  
  $ffmpeg = "/usr/bin/ffmpeg";
  
  $videoFile="/etc/nginx/html/test.mp4";
  
  $thumbnail= "/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg";
  
  
  
  $cmd = "$ffmpeg -i $videoFile -ss 00:00:01 -vframes 1 -vf scale=240:120 $thumbnail 2>&1 &";
  
  
  
  $output = shell_exec($cmd);
  
  echo "<pre>".$output."</pre>";
  
  ?>

  This returns the message like below.

  ffmpeg version 2.8.11-0ubuntu0.16.04.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 20160609
  
    configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencv
  
    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/etc/nginx/html/Share/test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:06.40, start: 0.000000, bitrate: 1321 kb/s
  
      Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 932 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  [swscaler @ 0x1621be0] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to '/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 240x120 [SAR 20:23 DAR 40:23], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.60.100 mjpeg
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  [image2 @ 0x16165a0] Could not open file : /etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail1.jpg
  
  av_interleaved_write_frame(): Input/output error
  
  frame=    1 fps=0.0 q=3.9 Lsize=N/A time=00:00:00.04 bitrate=N/A    
  
  video:8kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed!

  UPDATED : I also gave permission to ffmpeg by chmod +x $(which ffmpeg)

  I tried php /etc/nginx/html/Share/ffmpeg/ffmpeg.php in the terminal, and it also does conversion fine.

    libavutil      54. 31.100 / 54. 31.100
  
    libavcodec     56. 60.100 / 56. 60.100
  
    libavformat    56. 40.101 / 56. 40.101
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 40.101 /  5. 40.101
  
    libavresample   2.  1.  0 /  2.  1.  0
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.101 /  1.  2.101
  
    libpostproc    53.  3.100 / 53.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/etc/nginx/html/Share/test.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.24.2
  
    Duration: 00:00:06.40, start: 0.000000, bitrate: 1321 kb/s
  
      Stream #0:0(und): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p, 640x368 [SAR 1:1 DAR 40:23], 932 kb/s, 25 fps, 25 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp, 383 kb/s (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  [swscaler @ 0x72dbe0] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, image2, to '/etc/nginx/html/Share/ffmpeg/thumbnails/thumbnail.jpg':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 240x120 [SAR 20:23 DAR 40:23], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc (default)
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.60.100 mjpeg
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 (native) -> mjpeg (native))
  
  Press [q] to stop, [?] for help
  
  frame=    1 fps=0.0 q=3.9 Lsize=N/A time=00:00:00.04 bitrate=N/A    
  
  video:8kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown