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• What is the "Error initializing filter 'drawtext' with args..." error in using of ffmpeg at c# process class ?

  7 novembre 2016, par parsa

  I used this below code for create a resolution of a video and write text on it.

      var proc = new System.Diagnostics.Process();
  
      strin OrginalResolution="nhd";
  
      proc.EnableRaisingEvents = false;
  
      proc.StartInfo.FileName = ffmpegPath;
  
      proc.StartInfo.Arguments = "-i \"" + fileIn +
  
                                 "\" -f mp4 -s " + OrginalResolution + " -vf drawtext=fontfile=/OtherProjects/ConvertProj/ff‌​mpeg/OpenSans-Reg‌​ular.ttf:text=Parsa" \"" + fileOut.Split('.')[0] +
  
                                 ".mp4";
  
      proc.StartInfo.UseShellExecute = false;
  
      proc.StartInfo.CreateNoWindow = false;
  
      proc.StartInfo.RedirectStandardOutput = true;
  
      proc.StartInfo.RedirectStandardError = true;
  
  
  
      proc.Start();
  
      proc.WaitForExit();
  
      string sdsd = proc.StandardError.ReadToEnd();
  
      proc.Close();

  I faced with this problem(some string output of StandardError is in below) :

  Fontconfig error: Cannot load default config file\r\n[Parsed_drawtext_0       
  
  @0000000002fd8c20] Cannot find a valid font for the family 
  
  Sans\r\n[AVFilterGraph @ 0000000000511660] Error initializing 
  
  filter'drawtext' with args 
  
  'fontfile=/OtherProjects/ConvertProj/ffmpeg/OpenSans-
  
  Regular.ttf:text=parsa'\r\nError opening 
  
  filters!\r\n

  In cmd the same argument value of process works fine.
  I read that this issue related to how to using quotation mark at using
  of text property of drawtext in ffmpeg.but I can’t find any
  solution for solving this issue.
  Can anyone help me ?

  Can anyone help me still ?Is this a bug ?
  I used any solutions for escape from : in my code,but can’t solve this problem.
  It can’t find font.I delete other filters of drawtext to findout that any of filters don’t mistake, but still error exists yet.

  expansion=none property of drawtext doesn’t influence on this case, for escape :.

• Converting .webm to mp4 produces "incorrect parameters" error [duplicate]

  23 mars 2020, par Chognificent

  I am attempting to convert a particular video from webm to mp4 using :
  ffmpeg -fflags +genpts -i $input -r 24 $output, but I am getting an error :

  [libx264 @ 0x55c8801feb00] width not divisible by 2 (1025x525)
  
  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
  
  [aac @ 0x55c880283340] Qavg: 110.549
  
  [aac @ 0x55c880283340] 2 frames left in the queue on closing

  Is there a solution I can use that will be generic for all videos including this video file.

• c++ ffmpeg "Starting new cluster" error

  9 novembre 2016, par R2-D2

  I want to encode a live stream into webm, but ffmpeg gets stuck in a live lock after 5 seconds stating

  [webm @ 0x1d81940] Starting new cluster at offset 0 bytes, pts 5040dts 5040

  I tried increasing the related AVFormatContext params

  av_opt_set_int(oc->priv_data, "chunk_duration", INT_MAX, 0);
  
  av_opt_set_int(oc->priv_data, "cluster_time_limit", INT_MAX, 0);
  
  av_opt_set_int(oc->priv_data, "cluster_size_limit", INT_MAX, 0);

  which avoids the error for about 30 seconds, but then again ffmpeg hangs

  [webm @ 0xbc9940] Starting new cluster due to timestamp
  
  [webm @ 0xbc9940] Starting new cluster at offset 0 bytes, pts 32800dts 32800

  The error can be reproduced with the official example doc/examples/muxing.c just by writing into a buffer instead of a file like this

  oc = avformat_alloc_context();
  
  oc->oformat = av_guess_format("webm", NULL, NULL);
  
  oc->oformat->flags |= AVFMT_NOFILE;

  and for actual writing

  uint8_t *output_buf;
  
  avio_open_dyn_buf(&oc->pb);
  
  
  
  avformat_write_header(oc, &opt);
  
  /* or */
  
  av_interleaved_write_frame(fmt_ctx, pkt);
  
  
  
  avio_close_dyn_buf(oc->pb, &output_buf);
  
  av_free(output_buf);

  How can I encode webm into a buffer ?
  (And why does it work for files ?)