compression FFMPEG vs Handbrake giving me different results

[Mr.Stork]

As the 1080p videos from my phone and camera are bloated, running them through handbrake removes the metadata, so I have to use ffmpeg with "-map_metadata 0".

 

These are my video settings on handbrake - Nvidia NVNC HEVC h265, CQR 30, Slow preset. Not sure how much rc-lookahead is affecting the video size, and I don't know what the right command for ffmpeg is. Everything else is passthrough'd. 

 

I got the .bat script from EposVox's github which I edited a bit, full code listed at the bottom. I just want to mirror all settings in handbrake to ffmpeg.

 

The video quality, as I tested using vmaf are slightly worse than the handbrake's encode, and are always smaller. Although I don't see the difference quite as much without pixel peeping, I only tested with smaller videos. 

ffmpeg -hwaccel auto -i "%%A" -map 0:v -map 0:a -map_metadata 0 -c:v hevc_nvenc -preset slow -rc constqp -qp %ffmpeg_qv% -b:v 0K -c:a aac -b:a 384k -movflags +faststart -movflags use_metadata_tags "%%A_compressed.mp4"

 

 

pushd "%2"

::Default variables
SET paths=paths.txt
::paths lets you put a bunch of folder paths in a text file and run this across those, instead of individually. I use this to run overnight on a LOT of footage folders at once. Thanks to Aayla for a lot of these upgrades
::Fun tip - select your folders (15 max at a time) and shift+right-click and click "copy as paths"
SET /A ffmpeg_qv=30
::change CQP value here so you only have to type it once. 22 is lossless for HEVC.

::for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do (
::    echo Processing %%A
::    ffmpeg -hwaccel auto -i "%%A" -pix_fmt p010le -map 0:v -map 0:a -c:v hevc_nvenc -rc constqp -qp 21 -b:v 0K -c:a libfdk_aac -vbr 5 -movflags +faststart "%%A~dnpA_CRF%ffmpeg_qv%_HEVC.mp4"
::    echo Processed %%A
::)
::pause
::Test if the paths file exists and iterate through it
if EXIST %paths% (
    for /f "tokens=*" %%a in (%paths%) do (
        echo Changing to directory %%a
        pushd "%%a"
        CALL :ffmpeg
    )
) else (
    ::It doesn't exist
    CALL :ffmpeg
)
pause
EXIT /B %ERRORLEVEL%
::Don't run the function when they're first defined because that's a thing Batch does for some reason???
:ffmpeg
    for /R %%A in (*.mp4, *.avi, *.mov, *.wmv, *.ts, *.m2ts, *.mkv, *.mts) do (
        echo Processing "%%A"
        ffmpeg -hwaccel auto -i "%%A" -map 0:v -map 0:a -map_metadata 0 -c:v hevc_nvenc -preset slow -rc constqp -qp %ffmpeg_qv% -b:v 0K -c:a aac -b:a 384k -movflags +faststart -movflags use_metadata_tags "%%A_compressed.mp4"
		::"-pix_fmt p010le" is setting it to 10-bit instead of 420 8-bit, which is what I had before (removed by me)
		:: "-map_metadata 0" copies all metadata from source file
		:: "-movflags +faststart" helps with audio streaming
        echo Processed %%A
    )
GOTO :EOF

 

 

[WereCat]

QP21 in FFMPEG, no rc-lookahead (much higher quality in theory but also higher file size)

 

QP30 in Handbrake, with rc-lookiahead

 

At least the obvious things I catched from quick glance on those screenshots

[Mr.Stork]

34 minutes ago, WereCat said:

QP21 in FFMPEG, no rc-lookahead (much higher quality in theory but also higher file size)

 

QP30 in Handbrake, with rc-lookiahead

 

At least the obvious things I catched from quick glance on those screenshots

The QP21 is in comment, the actual code is set to 30 at the top. Check 7th line.