Audio: Over modulated and in 2.0 rather than 5.1 format and the aac codec needs updating.
Video: Updated HEVC codec needed. Adding parameters i.e.: [--me 3 --max-merge 3 --subme 5
--tu-intra-depth 4 --tu-inter-depth 4 --aq-motion --analyze-src-pics --range full](especially [--me
3] will improve coding albeit slowing down the encode process but lowering the bitstream while
maintaining quality.
[--early-skip] will help speed up the process without any significant detrimental effects on quality
or file size.
Adding [--rdoq-level 1 --psy-rdoq 2.50 --psy-rd 2] improves temporal visual quality at the expense
of file size.
The default crf for HEVC is 28.0. You are using 24.0. I like cranking it up to 25.5 giving a smaller
bitstream while still having a very tolerable video.
Current versions of x265 will utilize AVX/AVX2 instructions sets depending on your processor. This
will greatly improve encoding speeds. Since you are using Linux, I'm not sure that there are
versions that are capable of using PGO (Performance Guided Optimization), but that's also a major
improvement in speed.
Your encoding versions:
Lavc57.64.101
Lavf57.56.101
MKVMerge v24.0.0 ('Beyond the Pale')
New versions:
Lavc58.32.100
Lavf58.18.104
MKVMerge v27.0.0 ('Metropolis')
x265 v2.8+74
Please update, but most of all, STOP over-modulating the audio!
NOTE: When encoding AAC-LC, I like these parameters:
Step 1:
FFMPEG -i {input}.mkv -sn -vn -ac 6 -ar 384000 -cutoff 0 -af volume=volume={max gain before
distortion}dB:precision=double,aformat=s32:384000 {output}(FLAC384k~24b-5.1).flac
Step 2:
FFMPEG -i {input}(FLAC384k~24b-5.1).flac -sn -vn -acodec aac -ac 6 -ar 96000 -aq 2.35 -cutoff 0
-aac_pns disable -aac_tns disable -af
volume=volume=-1.25dB:precision=double,equalizer=f=22500:t=q:w=0.8:g=+21,equalizer=f=48:t=q:w=2.2:g=+5
{output}(AAC96-aq=2.35-5.1).mka
(As an audio engineer, I do not like the Perceptual Noise Substitution or Temporal Noise Shaping and
by disabling these parameters, results in a smaller, better sounding, more transparent .mka(aac)
file. I don't like lossy audio encoding, given a choice it would be FLAC24b/192kHz, but I don't have
10 terabytes of storage either.)
Assemble HEVC, AAC-LC, (optional)SRT,ASS,etc. with MKVToolNix. Review, make video/audio
synchronization changes if needed in MKVToolNix; reassemble.
Regards,
FlipFlops2001
Audio Engineer: FOH, MON, SE, Studio (1974-present)
Video: Updated HEVC codec needed. Adding parameters i.e.: [--me 3 --max-merge 3 --subme 5
--tu-intra-depth 4 --tu-inter-depth 4 --aq-motion --analyze-src-pics --range full](especially [--me
3] will improve coding albeit slowing down the encode process but lowering the bitstream while
maintaining quality.
[--early-skip] will help speed up the process without any significant detrimental effects on quality
or file size.
Adding [--rdoq-level 1 --psy-rdoq 2.50 --psy-rd 2] improves temporal visual quality at the expense
of file size.
The default crf for HEVC is 28.0. You are using 24.0. I like cranking it up to 25.5 giving a smaller
bitstream while still having a very tolerable video.
Current versions of x265 will utilize AVX/AVX2 instructions sets depending on your processor. This
will greatly improve encoding speeds. Since you are using Linux, I'm not sure that there are
versions that are capable of using PGO (Performance Guided Optimization), but that's also a major
improvement in speed.
Your encoding versions:
Lavc57.64.101
Lavf57.56.101
MKVMerge v24.0.0 ('Beyond the Pale')
New versions:
Lavc58.32.100
Lavf58.18.104
MKVMerge v27.0.0 ('Metropolis')
x265 v2.8+74
Please update, but most of all, STOP over-modulating the audio!
NOTE: When encoding AAC-LC, I like these parameters:
Step 1:
FFMPEG -i {input}.mkv -sn -vn -ac 6 -ar 384000 -cutoff 0 -af volume=volume={max gain before
distortion}dB:precision=double,aformat=s32:384000 {output}(FLAC384k~24b-5.1).flac
Step 2:
FFMPEG -i {input}(FLAC384k~24b-5.1).flac -sn -vn -acodec aac -ac 6 -ar 96000 -aq 2.35 -cutoff 0
-aac_pns disable -aac_tns disable -af
volume=volume=-1.25dB:precision=double,equalizer=f=22500:t=q:w=0.8:g=+21,equalizer=f=48:t=q:w=2.2:g=+5
{output}(AAC96-aq=2.35-5.1).mka
(As an audio engineer, I do not like the Perceptual Noise Substitution or Temporal Noise Shaping and
by disabling these parameters, results in a smaller, better sounding, more transparent .mka(aac)
file. I don't like lossy audio encoding, given a choice it would be FLAC24b/192kHz, but I don't have
10 terabytes of storage either.)
Assemble HEVC, AAC-LC, (optional)SRT,ASS,etc. with MKVToolNix. Review, make video/audio
synchronization changes if needed in MKVToolNix; reassemble.
Regards,
FlipFlops2001
Audio Engineer: FOH, MON, SE, Studio (1974-present)
