Recherche avancée

Sur d’autres sites (11397)

• avformat_write_header is not working properly in ffmepg

  26 mars 2017, par ganesh kumar

  I was working on mp4 file creation project using FFMPEG, i tried to convert the stream information of video packet based on FFMPEG muxing,remuxing code, but header get damaged after convert into so file is corrupted.

  /*this code using set the stream information */

  AVFormatContext *input_context,*output_context;
  
      AVDictionary *opt;
  
     AVStream *out_stream;
  
     AVCodecContext *newcontext=NULL;
  
     out_stream= avformat_new_stream(output_context,NULL);
  
                  newcontext = avcodec_alloc_context3(codec);
  
                  newcontext->codec_id=Output_fmt->video_codec;
  
                  newcontext->bit_rate =in_stream->codec->bit_rate;
  
                  newcontext->width    = in_stream->codec->width;
  
                  newcontext->height   = in_stream->codec->height;
  
                  newcontext->timecode_frame_start=in_stream->codec->timecode_frame_start;
  
                  newcontext->gop_size      = in_stream->codec->gop_size;
  
                  newcontext->profile       =  in_stream->codec->profile;
  
                  newcontext->level         =in_stream->codec->level;
  
                  newcontext->pix_fmt       = PIX_FMT_YUV420P;
  
                  newcontext->frame_size=in_stream->codec->frame_size;
  
                  newcontext->sample_fmt=in_stream->codec->sample_fmt;
  
                  newcontext->sample_rate=in_stream->codec->sample_rate;
  
                   time_base=  (double)in_stream->time_base.num / (double)in_stream->time_base.den;
  
                   duration= (double)in_stream->duration * time_base * 1000.0;
  
                  if (!out_stream) {
  
                      fprintf(stderr, "Failed allocating output stream\n");
  
                      ret = AVERROR_UNKNOWN;
  
                      return;
  
                  }
  
                 ret = avcodec_copy_context(out_stream->codec,newcontext);
  
                  if (ret < 0) {
  
                      fprintf(stderr, "Failed to copy context from input to output stream codec context\n");
  
                      goto end;
  
                  }
  
                  out_stream->codec->codec_tag = 0;
  
                  if (output_context->oformat->flags & AVFMT_GLOBALHEADER)
  
                      out_stream->codec->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;

  Changed the Header Information using :
  /*this code using set the metadata */

  av_dict_set(&opt, "major_brand", "mp42", 0);
  
      av_dict_set(&opt, "minor_version","512" , 0);
  
      av_dict_set(&opt, "compatible_brands","isomiso2avc1mp41",0);
  
      av_dict_set(&opt, "comment","Hash=855738390",0);
  
      output_context->metadata = opt;
  
      ret = avformat_write_header(output_context,NULL);

  after create the mp4 file check file using ffmpeg in terminal. getting Error like this :

  /this error message/

  [mpeg4 @ 0x7ff2b9811c00] header damaged Last message repeated 39
  times [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff2ba800000] decoding for stream 0
  failed [mov,mp4,m4a,3gp,3g2,mj2 @ 0x7ff2ba800000] Could not find codec
  parameters for stream 0 (Video : mpeg4 (mp4v / 0x7634706D), none, 376
  kb/s) : unspecified size Consider increasing the value for the
  ’analyzeduration’ and ’probesize’ options.

• ffmpeg batch retains old filetype in name

  3 juin 2018, par InsertDisplayNameHere

  I’m using the following ffmpeg script to convert all .mp4 files in the folder to .webm.

  for %%A IN (*.mp4) DO ffmpeg -i "%%A" -c:v libvpx -crf 4 -b:v 3M -c:a libvorbis "%%A.webm"

  I am trying to make it go from "xxx.mp4" to "xxx.webm"

  However when I run the script the file name goes from "xxx.mp4" to "xxx.mp4.webm"

  Any suggestions are highly appreciated.

• ffmpeg batch retains old filetype in name

  8 février 2015, par InsertDisplayNameHere

  I’m using the following ffmpeg script to convert all .mp4 files in the folder to .webm.

  for %%A IN (*.mp4) DO ffmpeg -i "%%A" -c:v libvpx -crf 4 -b:v 3M -c:a libvorbis "%%A.webm"

  I am trying to make it go from "xxx.mp4" to "xxx.webm"

  However when I run the script the file name goes from "xxx.mp4" to "xxx.mp4.webm"

  Any suggestions are highly appreciated.