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• Transcode video with ffmpeg can't play by Win10 system player ?

  16 juin 2017, par wzjing

   I’m doing a video transcoder demo with ffmpeg lib and libx264 lib. I already can transcode video successully, but the output video can only play by some powerful player like VLC. I need it can be played by the Win10 system player and the Android system player. I hava found the reason may be encode AVCodecContext args. I try to copy those args frome decode AVCodecContext, the output can be played by Win10 defualt player, but the video became totally black.
   Here is my encode AVCodecContext args :

          encoder = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  
  
          if (!encoder) {
  
              av_log(NULL, AV_LOG_FATAL, "Necessary encoder not found\n");
  
              return AVERROR_INVALIDDATA;
  
          }
  
          enc_ctx = avcodec_alloc_context3(encoder);
  
          enc_ctx->height = output_height;
  
          enc_ctx->width = output_width;
  
          enc_ctx->sample_aspect_ratio = dec_ctx->sample_aspect_ratio;
  
          enc_ctx->bit_rate = 1000000;
  
  
  
          /* take first format from list of supported formats */
  
          if (encoder->pix_fmts)
  
              enc_ctx->pix_fmt = AV_PIX_FMT_YUV420P;
  
          else
  
              enc_ctx->pix_fmt = dec_ctx->pix_fmt;
  
  
  
          enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
  
          enc_ctx->gop_size = 12;
  
          av_opt_set(enc_ctx->priv_data, "preset", "slow", 0);
  
          av_opt_set(enc_ctx->priv_data, "tune", "zerolatency", 0);
  
  
  
          enc_ctx->profile = FF_PROFILE_H264_HIGH;
  
          enc_ctx->codec_type = AVMEDIA_TYPE_VIDEO;       
  
  
  
          enc_ctx->codec_tag = 0;

• FFMPEG Concat failing - System cannot find the file specified

  16 janvier 2017, par geekman

  I’m a PC. I just reversed a video, and want to combine the original file and the reversed file into one new output.mp4 file

  I’m using code copied directly from the ffmpeg wiki

  ffmpeg -i input1.mp4 -i input2.webm \
  
  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" \
  
  -map "[v]" -map "[a]" <encoding options="options"> output.mkv
  
  </encoding>

  This is my version :

  ffmpeg -i C:\xampp\htdocs\reviews\uploads\0115171331.mp4 -i C:\xampp\htdocs\reviews\uploads\R0115171331.mp4 \
  
  -filter_complex "[0:v:0] [0:a:0] [1:v:0] [1:a:0] concat=n=2:v=1:a=1 [v] [a]" \
  
  -map "[v]" -map "[a]"  C:\xampp\htdocs\reviews\output.mp4

  And when I run it, it just gives me :

  The system cannot find the file specfied.

  Again, my other ffmpeg commands worked, and these files (except for output) do exist. I’ve double checked.

  Any idea what could be going wrong ?

• configure : Express atomics/thread deps through the dependency system

  18 décembre 2013, par Diego Biurrun

  configure : Express atomics/thread deps through the dependency system
  

  • [DH] configure