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• aacenc_ltp : disable LTP with high lambda values

  8 décembre 2015, par Rostislav Pehlivanov

  aacenc_ltp : disable LTP with high lambda values
  Makes no sense to enable for high bitrates, the coder does well enough.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aacenc_ltp.c
  • [DH] tests/fate/aac.mak

• Set H264 high quality encoding in FFMPEG

  25 décembre 2015, par hiitiger

  I’m working on a function, using ffmpeg to encode a serial images to a MP4 file.
  I use H264 codec, and want to have a high quality output.

  Other things now goes well, but the video quality looks obvious loss.

  After some Google, I set codec context like this

  video_st = avformat_new_stream(oc, 0); 
  
  ....
  
  pVideoCodec  = avcodec_find_encoder(fmt->video_codec); //AV_CODEC_ID_H264
  
  ....
  
  avcodec_get_context_defaults3(video_st->codec, pVideoCodec);
  
  video_st->codec->codec_id =  fmt->video_codec;
  
  video_st->codec->width = m_outWidth;
  
  video_st->codec->height = m_outHeight;
  
  video_st->codec->time_base.den = m_fps;
  
  video_st->codec->time_base.num = 1;
  
  video_st->codec->pix_fmt = AV_PIX_FMT_YUV420P;
  
  
  
  AVDictionary *param = nullptr;
  
  av_dict_set(&param, "qp", "0", 0);
  
  av_dict_set(&param, "preset", "medium", 0);

  I also try to set bit_rate. But all turned out to be bad.

  I want a visually loss less output video.

  So what parameters should I set or anything else did I missed ?

• avcodec/mpeg12enc : Move high resolution thread check to before initializing threads

  21 janvier 2016, par Michael Niedermayer

  avcodec/mpeg12enc : Move high resolution thread check to before initializing threads
  Cleaner solution is welcome !
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/mpeg12enc.c
  • [DH] libavcodec/pthread_slice.c