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• FFmpeg H.264 NVENC - high444p profile not working at 1920x1080 via library but works via command line encoding

  10 décembre 2024, par Vivek Nathani

  I am building a real-time desktop streaming application in Rust and I am using FFmpeg (H.264 NVENC) to encode the raw frames captured as BGRA from desktop.

  


  I am able to get it to work on profiles such as baseline, main, and high but nothing seems to be working on high444p which is what I need to do 4:4:4 chroma subsampling.

  


  Below is the setup I have for constructing the encoder. I am using the rust-ac-ffmpeg crate to do this.

  


  builder = builder
    .pixel_format("bgra")
    .height(1080)
    .width(1920)
    .set_option("profile", "high444p")
    .set_option("preset", "medium")
    .set_option("tune", "hq")
    .set_option("b:v", "30M")
    .set_option("maxrate", "30M")
    .set_option("bufsize", "60M")
    .set_option("framerate", "60")
    .set_option("pix_fmt", "yuv444p");


  


  No matter what combination of settings I try, I always get a single line error as follows :

  


  [h264_nvenc @ 0000020bf69f6680] InitializeEncoder failed: invalid param (8): Invalid Level.


  


  I have also tried adding levels explicitly. Have tried 4.1, 4.2, 5.1, 5.2, 6.1 and 6.2.

  


  The only case where this does work is if the resolution is low, let's say around 500x500 or 600x800. But this is not suitable for my usecases.

  


  Moreover, the equivalent command for this just works right out of the box. On the same machine. Same ffmpeg version. Running this command on an output.raw file which is just a dump of the frames captured by my screen capture mechanism.

  


  ffmpeg -f rawvideo -pix_fmt bgra -s 1920x1080 -framerate 60 -i input.raw -c:v h264_nvenc -preset p1 -profile:v high444p -pix_fmt yuv444p -b:v 30M -maxrate 30M -bufsize 60M output.mp4


  


• libavformat/hlsenc.c : Populate OTI using AAC profile in write_codec_attr.

  1er janvier 2024, par Romain Beauxis

  libavformat/hlsenc.c : Populate OTI using AAC profile in write_codec_attr.
  This patch populates the third entry for HLS codec attribute using the
  
  AAC profile.
  The HLS specifications[1] require this value to be the Object Type ID as
  
  referred to in table 1.3 of ISO/IEC 14496-3:2009[2].
  The numerical constants in the code refer to these OTIs minus one, as
  
  documented in commit 372597e[3], confirmed by comparing the values in the
  
  code with the values in the table mentioned above.
  Links :
  
  1 : https://datatracker.ietf.org/doc/html/rfc6381#section-3.3
  
  2 : https://csclub.uwaterloo.ca/~ehashman/ISO14496-3-2009.pdf
  
  3 : https://github.com/FFmpeg/FFmpeg/commit/372597e5381c097455a7b73849254d56083eb056
  Changes in this version :
  
   Default value set to "mp4a.40.2" when profile is unknown for backward
  
    compatibility.
  Signed-off-by : Steven Liu <liuqi05@kuaishou.com>
  

  • [DH] libavformat/hlsenc.c

• avcodec/codec_internal : add cap for ICC profile support

  28 juin 2022, par Niklas Haas

  avcodec/codec_internal : add cap for ICC profile support
  Codecs that can read/write ICC profiles deserve a special capability so
  
  the common logic in encode.c/decode.c can decide whether or not there
  
  needs to be any special handling for ICC profiles. The motivation here
  
  is to be able to use it to decide whether or not an ICC profile needs to
  
  be generated in the encode path, but it might as well get added to
  
  decoders as well for purely informative reasons.
  It's not entirely clear to me whether the "thp" and "smvjpeg" variants
  
  of "mjpeg" should have this capability set or not, given that the code
  
  technically supports it but I somehow doubt these files may contain
  
  them. In either case, this cap is purely informative for decoders so it
  
  doesn't matter too much either way.
  It's also not entirely clear whether the "amv" encoder should signal ICC
  
  profile support, but again erring on the side of caution, we probably
  
  *shouldn't* be generating (and encoding !) ICC profiles for this type of
  
  media file.
  Signed-off-by : Niklas Haas <git@haasn.dev>
  

  • [DH] libavcodec/codec_internal.h
  • [DH] libavcodec/libjxldec.c
  • [DH] libavcodec/libjxlenc.c
  • [DH] libavcodec/mjpegdec.c
  • [DH] libavcodec/mjpegenc.c
  • [DH] libavcodec/pngdec.c
  • [DH] libavcodec/pngenc.c
  • [DH] libavcodec/tiff.c
  • [DH] libavcodec/webp.c