Newest 'libx264' Questions - Stack Overflow

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• How to use commercial libx264 with GStreamer ? [closed]

  23 octobre 2018, par Vlad.Z

  I need to produce an x264 video stream with my product using GStreamer framework, and I am going to get a commercial x264 license for that. But now the question is how to actually plug the commercial x264 into GStreamer, because the x264enc element is under GPL. Anyone has experience with this? Thanks.

• How can I set x.264 lambda parameter ? [closed]

  5 octobre 2018, par Atrin

  I'm wondering how I can change lambda parameter in x.264? that would be great if I can have a sample command to do that.

• x264 options for colorprim

  25 septembre 2018, par Kumar Swaminathan

  I have a source with the following color characteristics (as determined by ffprobe using "ffprobe -v error -show_format -show_streams source") colormatrix=smpte170m:colorprim=reserved:transfer=reserved.

  I would like to preserve this and so I encoded with ffmpeg with libx264 by specifying the following x264 specific options:

  "-vcodec libx264 -profile:v baseline -level 3.1 -b:v 2400k -preset medium -x264opts ref=3:keyint=90:colormatrix=smpte170m:colorprim=reserved:transfer=reserved -r 30000/1001"

  But now I get an error =>

  [libx264 @ 0x2234820] bad value for 'colorprim': 'reserved'

  Error initializing output stream 0:1 -- Error while opening encoder for output stream #0:1 - maybe incorrect parameters such as bit_rate, rate, width or height

  What should the ideal mapping here be to preserve the input color characteristics ?

• Conversion from mjpeg to mp4 (libx264) with FFmpeg

  19 septembre 2018, par salud

  If you convert from mjpeg to mp4 (libx264) with FFmpeg, Playback can not be performed on Windows · Mac.

  Thumbnails are not displayed on the icon. However, with the HTML5 Video tag, playback is possible.

  Why? Please tell me if you understand. Thank you.

  ffmpeg -i source_file.mov -b 4000k -vcodec libx264 destination_file.mp4
  

• Export dynamic metadata using x265

  28 août 2018, par nam

  I am working on ffmpeg and x265 for video encoding. From the release note of x265:

  HDR10+ supported. Dynamic metadata may be either supplied as a bitstream via the userSEI field of x265_picture, or as a json jile that can be parsed by x265 and inserted into the bitstream; use --dhdr10-info to specify json file name, and --dhdr10-opt to enable optimization of inserting tone-map information only at IDR frames, or when the tone map information changes.

  But I dont know how to export the dynamic metadata from a video sequence as a userSEI or json file. Hope to get solution from you.