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• I want to captured thumbnail from video but my code is not working

  10 mars 2016, par Zisu

  I want to captured thumbnail from video but my code is not working
  my code :

  $srcFile="https://upic-data-staging.s3.amazonaws.com/uploads/temp/4d265ec5602a67ca39053971372e3f06ffad897c.mp4";
  
     $ffmpeg = '/usr/local/bin/';
  
     $destFile = 'uploads/thumbs/123.jpg';
  
     $cmd = sprintf('%sffmpeg -i %s -an -ss 00:00:05 -r 1 -vframes 1 -y %s', 
  
              $ffmpeg, $srcFile, $destFile);
  
     exec($cmd);

  My video is in aws server

• How to feed data to libav from ethernet streams with video&audio threads

  19 août 2013, par Sirenko

  I have two ethernet streams with H.264 payload and G.711 payload.
  I want to write payloads to file with avi extension using libav.
  I can put data from the payload to the file sample.h264 and then using libav
  function (avformat_open_input, avformat_find_stream_info...)write frames to file sample0.avi.
  I can also do the same thing with g711 and write in sample1.avi
  I can get : Bandwidth information : AS:768 Media Attribute : rtpmap : 117 H264/90000... from Session Description Protocol.
  I guess how to collect video frame but don't know how to specify correct context( AVFormatContext) and
  write data to AVPacket structure (possibly using av_packet_from_data).
  Please suggest how to feed the data to libav from ethernet streams to
  get file *.avi which consists of video and audio threads.

   const char *sFileOutput = "d://video_stream.avi";
  
  ofmt = av_guess_format(NULL, sFileOutput, NULL);
  
  ofcx = avformat_alloc_context();
  
  ofcx->oformat = ofmt;
  
  memcpy(ofcx->filename, sFileOutput, sizeof(ofcx->filename));
  
  if( avio_open2( &ofcx->pb, sFileOutput, AVIO_FLAG_WRITE, NULL, NULL ) < 0){…}
  
  ocodec = avcodec_find_decoder(CODEC_ID_H264);
  
  ost = avformat_new_stream(ofcx, ocodec);
  
  occx = ost->codec;
  
  occx->codec_id = CODEC_ID_H264;
  
  occx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  avcodec_get_context_defaults3(occx, ocodec);
  
  if (avcodec_open2(ost->codec, ocodec, NULL) < 0) {…}
  
  if(avio_open2( &ofcx->pb, sFileOutput, AVIO_FLAG_WRITE, NULL, NULL )) {…}
  
  avformat_write_header( ofcx, NULL );
  
  av_dump_format(ofcx    , 0, ofcx->filename,      1 );
  
  ix = 0;

  ...

  av_init_packet( &pkt );
  
  // m_sFrameBuf – This is a frame formed from the data received from the Ethernet
  
  av_packet_from_data(&pkt, (uint8_t*) &m_sFrameBuf, m_nFpameSize);
  
  pkt.stream_index = 0;//ost->id;
  
  pkt.pts = ix++;
  
  pkt.dts = pkt.pts;
  
  av_write_frame( ofcx, &pkt ); // in this point error -  Unhandled exception at 0x76ff15de in ***.exe: 0xC0000094: Integer division by zero
  
  av_free_packet( &pkt );

  Where is a mistake ?

  I'm working in Visual studio 2010

  Thanks in advance

• ffmpeg error while converting to mp4 Error while opening encoder for output stream #0.0

  20 mars 2016, par Josh

  I am trying to convert various file types to mp4 to be displayed using ffmpeg, but i keep getting the error :

  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

  Another piece that looks important is :

  [libx264 @ 0x93caef0] broken ffmpeg default settings detected

  [libx264 @ 0x93caef0] use an encoding preset (e.g. -vpre medium)

  [libx264 @ 0x93caef0] preset usage : -vpre -vpre

  [libx264 @ 0x93caef0] speed presets are listed in x264 —help

  [libx264 @ 0x93caef0] profile is optional ; x264 defaults to high

  The latest code I am running is :

  ffmpeg -i source -s 320x240 -r 30000/1001 -b 200k -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k destination

  I have seen a few other people with this issue, but their fixes didn’t work for some reason.

  In case it matters : ultimately this will be used in php, though I am trying to get it working first via putty

  EDIT: : Here is the full thing as requested(using a wmv, have tested wmv and flv) :

       ~ >> ffmpeg -i path.wmv -s 320x240 -r 30000/1001 -b 200k -r 29.97 -bt 240k -vcodec libx264 -coder 0 -bf 0 -refs 1 -flags2 -wpred-dct8x8 -level 30 -maxrate 10M -bufsize 10M -acodec libfaac -ac 2 -ar 48000 -ab 192k path.mp4
  
  FFmpeg version SVN-r26076, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Aug 28 2012 17:55:47 with gcc 4.1.2 20080704 (Red Hat 4.1.2-52)
  
    configuration: --enable-version3 --enable-gpl --enable-nonfree --enable-shared --enable-postproc --enable-avfilter --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvpx --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --disable-ffplay --disable-indevs --disable-outdevs --disable-demuxer=v4l --disable-demuxer=v4l2 --disable-mmx
  
    libavutil     50.36. 0 / 50.36. 0
  
    libavcore      0.16. 1 /  0.16. 1
  
    libavcodec    52.108. 0 / 52.108. 0
  
    libavformat   52.93. 0 / 52.93. 0
  
    libavdevice   52. 2. 3 / 52. 2. 3
  
    libavfilter    1.74. 0 /  1.74. 0
  
    libswscale     0.12. 0 /  0.12. 0
  
    libpostproc   51. 2. 0 / 51. 2. 0
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000/1) -> 29.97 (30000/1001)
  
  Input #0, asf, from 'path.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      IsVBR           : 0
  
      title           : Wildlife in HD
  
      artist          :
  
      copyright       : © 2008 Microsoft Corporation
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
    Duration: 00:00:30.09, start: 8.000000, bitrate: 6977 kb/s
  
      Stream #0.0(eng): Audio: wmav2, 44100 Hz, 2 channels, s16, 192 kb/s
  
      Stream #0.1(eng): Video: vc1, yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc
  
  File 'path.mp4' already exists. Overwrite ? [y/N] y
  
  [buffer @ 0x9ce9eb0] w:1280 h:720 pixfmt:yuv420p
  
  [scale @ 0x9ce8f70] w:1280 h:720 fmt:yuv420p -> w:320 h:240 fmt:yuv420p flags:0x4
  
  [libx264 @ 0x9ce9ef0] broken ffmpeg default settings detected
  
  [libx264 @ 0x9ce9ef0] use an encoding preset (e.g. -vpre medium)
  
  [libx264 @ 0x9ce9ef0] preset usage: -vpre <speed> -vpre <profile>
  
  [libx264 @ 0x9ce9ef0] speed presets are listed in x264 --help
  
  [libx264 @ 0x9ce9ef0] profile is optional; x264 defaults to high
  
  Output #0, mp4, to 'path.mp4':
  
      Stream #0.0(eng): Video: libx264, yuv420p, 320x240, q=2-31, 200 kb/s, 90k tbn, 29.97 tbc
  
      Stream #0.1(eng): Audio: libfaac, 48000 Hz, 2 channels, s16, 192 kb/s
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height
  
  </profile></speed>

  Thanks for any help