Changes between Version 19 and Version 20 of DenoiseExamples

Timestamp:

Jun 9, 2024, 5:25:33 PM (2 years ago)

Author:

uncoder

Comment:

Added section on codec-specific denoisers, for completeness.

DenoiseExamples

@@ -92 +92 @@
 }}}
 
-== Benchmarking the relative performance of denoise filters #Benchmarking
+=== Benchmarking the relative performance of denoise filters #Benchmarking
 
 The performance of denoise filters varies depending on a number of factors, including algorithm, patch size, number of planes being processed, hardware etc.  A user can measure and compare the relative performance of a denoise filter and the selected options using the [https://ffmpeg.org/ffmpeg-filters.html#latency_002c-alatency `latency`] benchmarking filter.
@@ -102 +102 @@
  [Parsed_latency] Min latency: 156 bitrate=N/A speed=14.1x
 
-$ ffmpeg -an -dn -sn -i "${In}" -filter:v nlmeans,latency,trim=end_frame=1000 -f 'null' -
+$ ffmpeg -an -dn -sn -i "${In}" -filter:v nlmeans,latency,trim=end_frame=1000 -f null -
  [Parsed_latency] Min latency: 136 bitrate=N/A speed=0.087x
 
@@ -251 +251 @@
 }}}
 
-Note:\\
-͏    At the time of writing (FFmpeg 7.0.1), the command-line interface help suggests that all options default to 0.  The Official FFmpeg online documentation suggests that the default value of luma_spacial is `4.0` and all other default values are solved-for.  The contradiction in documentation is noted.
+  Note: At the time of writing (FFmpeg 7.0.1), the command-line interface help suggests that all options default to 0.  The Official FFmpeg online documentation suggests that the default value of luma_spacial is `4.0` and all other default values are solved-for.  The contradiction in documentation is noted.
 
 Official FFmpeg online documentation is available at https://ffmpeg.org/ffmpeg-filters.html#hqdn3d
@@ -352 +351 @@
 
 Official FFmpeg online documentation is available at https://ffmpeg.org/ffmpeg-filters.html#vaguedenoiser
+
+== Codec-specific denoisers
+
+It is noted that some encoders include denoise functions as private codec options.
+  For example, the external x264 encoder supports the `--nr` option, where a user may specify a value in the range of {0...65536}, with the default being 0 (disabled).
+
+{{{#!shell
+$ x264 --nr 200 -o "${Out}" "${In}"
+
+$ ffmpeg -i "${In}" -codec:v 'libx264' -x264opts 'nr=200' "${Out}"
+}}}
+
+FFmpeg's range of denoise filters have the advantage of being codec-agnostic, can be evaluated independent of a transcode and offer a wider selection of algorithms.