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• avutil/film_grain_params : add av_film_grain_params_select()

  15 mars 2024, par Niklas Haas

  avutil/film_grain_params : add av_film_grain_params_select()
  Common utility function that can be used by all codecs to select the
  
  right (any valid) film grain parameter set. In particular, this is
  
  useful for AFGS1, which has support for multiple parameters.
  However, it also performs parameter validation for H274.
  

  • [DH] doc/APIchanges
  • [DH] libavutil/film_grain_params.c
  • [DH] libavutil/film_grain_params.h
  • [DH] libavutil/version.h

• Libavcodec and QuickSync

  15 février 2016, par FrancescoBLT

  I’m attempting to encode in h264 format using libavcodec with and without QuickSync hardware acceleration. If I don’t use the hw acceleration is quite simple :

  ff_codec = avcodec_find_encoder(AV_CODEC_ID_H264) ;

  ff_cdctx = avcodec_alloc_context3(ff_codec) ;

  ff_cdctx->width = 1920;
  
  ff_cdctx->height = 1080;
  
  ff_cdctx->time_base.num = 1;
  
  ff_cdctx->time_base.den = 25;
  
  ff_cdctx->sample_aspect_ratio.num = 16;
  
  ff_cdctx->sample_aspect_ratio.den = 9;
  
  ff_cdctx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  av_dict_set(&param,"profile","main",0);
  
  av_dict_set(&param,"preset","medium",0);
  
  av_dict_set(&param,"tune","film",0)<0);
  
  ff_cdctx->gop_size = 10;
  
  ff_cdctx->max_b_frames = 1;
  
  opres = avcodec_open2(ff_cdctx,ff_codec,&param);
  
  ff_frame = av_frame_alloc();
  
  ff_frame->format = ff_cdctx->pix_fmt;
  
  ff_frame->width  = ff_cdctx->width;
  
  ff_frame->height = ff_cdctx->height; 
  
  
  
  opres = av_image_alloc(ff_frame->data, ff_frame->linesize,ff_cdctx->width,ff_cdctx->height,ff_cdctx->pix_fmt, 32);
  
  ff_frame->linesize[0] = ff_cdctx->width;
  
  ff_frame->linesize[1] = ff_frame->linesize[2] = ff_cdctx->width>>1;
  
  
  
  ff_frame->sample_aspect_ratio.num = ff_cdctx->sample_aspect_ratio.num;
  
  ff_frame->sample_aspect_ratio.den = ff_cdctx->sample_aspect_ratio.den;
  
  av_init_packet(&pkt);
  
  enc_err = avcodec_encode_video2(ff_cdctx,&pkt,ff_frame,&got_pkt);  }

  And so on for all source frame. Problem arise when I attempt to use hardware
  acceleration. In this case I use :

  ff_codec = avcodec_find_encoder_by_name("h264_qsv") ;
  for gathering the codec. But when I attempt to open it, the result is "invalid parameter" :
  opres = avcodec_open2(ff_cdctx,ff_codec,&param) ;
  if(opres<0)
  
  if(av_strerror(opres,err_str,256)==0) OutputDebugStringA(err_str) ;
  return -6 ;
  
  Did anyone have attempted to use QuickSync from code ? In the examples there is only one file (qsvdec.c) and is for decoding, not for encoding.
  regards

• x264 on Ubuntu video bad/corrupted

  6 septembre 2013, par Ryzone

  I am trying to use command line x264 to produce a blu-ray compatible file for use in Adobe Encore. For the source file I've tried both ProRes and mpeg2, both 1080p24. Both files import into Encore fine (no transcoding needed which is great) but the ProRes version is pink and grey "static" and the mpeg2 is just a bunch of green/black lines. The exact same files and the exact same commands on my Win7 PC come out fine. I'm only doing a 10 sec sample of the complete 90min movie. I'd love for it to work on Ubuntu cause it is running a new i7 haswell that encodes much quicker than my PC (many hours difference in encoding time)

  Ubuntu 13.04
  
  
  
  x264 0.135.2 f0c1c53<br />
  
  built on Jul 24 2013, gcc: 4.7.3<br />
  
  configuration: --bit-depth=8 --chroma-format=all<br />
  
  x264 license: GPL version 2 or later
  
  
  
  command:
  
      x264 --bitrate 30000 --preset veryslow --tune film --bluray-compat --fps 24000/1001 --force-cfr --bframes 3 --ref 4 --muxer raw --no-weightb --weightp 0 --b-pyramid none --vbv-maxrate 40000 --vbv-bufsize 30000 --level 4.1 --profile high --keyint 24 --min-keyint 1 --open-gop --slices 4 --colorprim "bt709" --transfer "bt709" --colormatrix "bt709" --sar 1:1  -o output.264 --input-res 1920x1080 sample.mov

  (if it would work I'd be doing two pass encoding)

  I am able to encode the sample file with ffmpeg to h264 (if that helps).