[FFmpeg-user] Benchmarking with ffmpeg - What are the parameters meaning?
Francois Visagie
francois.visagie at gmail.com
Tue Sep 11 14:13:50 CEST 2012
> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of David Wagner
> Sent: 11 September 2012 12:48
> To: FFmpeg user questions
> Subject: Re: [FFmpeg-user] Benchmarking with ffmpeg - What are the
> parameters meaning?
>
> Am 11.09.2012 09:38, schrieb Francois Visagie:
> >> -----Original Message-----
> >> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> >> bounces at ffmpeg.org] On Behalf Of David Wagner
> >> Sent: 11 September 2012 00:38
> >> To: FFmpeg user questions
> >> Subject: Re: [FFmpeg-user] Benchmarking with ffmpeg - What are the
> >> parameters meaning?
> >>
> >> Am 09.09.2012 23:01, schrieb Carl Eugen Hoyos:
> >>> David Wagner<david.wagner123<at> googlemail.com> writes:
> >>>
> >>>> frame= 1065 fps=214 q=-1.0 Lsize= 238kB time=00:00:35.46
> >>>> bitrate= 55.0kbits/s
> >>>> bench: utime=8.781s maxrss=49488kB
> >>>>
> >>>> What is meant by the fps? Is it the (averaged) speed at which the
> >>>> frames are processed?
> >>> No, not averaged but current.
> >>>
> >>>> So 1065frames / 214fps = 4,97 s. Which is not equal utime = 8,7818s.
> >>>> Also I have seen that at the end time=00:00:35.46 is exactly the
> >>>> length of the encoded video.
> >>> That is correct and this should be very accurate.
> >>>
> >>>> Could someone please explain me the parameters?
> >>> If you mean frame, size and bitrate, I assumed they are
> >>> self-explanatory...
> >>> (I suspect bitrate is also current, not average, but I did not
> >>> test.) utime is the time spent on CPU, maxrss should be maximum
> >>> memory footprint.
> >>>
> >> I couldn't find much information about theses parameters. Can you
> >> tell me is utime a good one for comparing codecs?
> >> What benefit do I have from knowing maximum memory footprint? It
> >> doesn't seem much informative.
> >>>> BTW exists there a mode for benchmarking the DEcoding process, so
> >>>> that I have some stats and won't need to play all the files in
> >>>> realtime?
> >>> I always use:
> >>> $ time ffmpeg -i input -f null -
> >>>
> >> Unfortunately I wanted to do the whole process on windows. So I don't
> >> have time.
> > It isn't quite clear to me exactly what time lapse you want to
> > measure. If it's for the whole ffmpeg pass from start to finish, I use
> > the below on Windows. %INPUT% and %OUTPUT% are set to the input and
> > output filenames respectively. %PASS% is obviously set to the pass. My
> > script actually uses a single command line for both passes,
> > appropriately adjusted for each. So the first time execution passes
> > through here %PASS% is set to 1 and the 2nd time to 2.
> >
> > Hopefully this is of some help.
> >
> > echo Start %INPUT%>%OUTPUT%.time.txt
> >
> > echo Start pass %PASS%>>%OUTPUT%.time.txt echo. | date | find /v
> > "Enter the new date: (yy-mm-dd)">>%OUTPUT%.time.txt echo. | time |
> > find /v "Enter the new time:">>%OUTPUT%.time.txt
> >
> > ffmpeg ... -pass %PASS% ...
> >
> > echo End pass %PASS%>>%OUTPUT%.time.txt echo. | date | find /v "Enter
> > the new date: (yy-mm-dd)">>%OUTPUT%.time.txt echo. | time | find /v
> > "Enter the new time:">>%OUTPUT%.time.txt
> >
>
> Thank you for your script. Can you tell me how I can start it with
arguments. I
> don't know the syntax. I tried to give it arguments but it doesn't takes
them.
> How can I set e.g. %OUTPUT% from command line?
My hard-coded DVD MPEG-2 script (called ffmpegencode.bat) is called with
parameters on the command line e.g.:
ffmpegencode input.avi 6090000 input.ass
where in this case input.avi is the input file, 6090000 is the requested
bitrate and input.ass is a subtitle file.
Command line parameters in Windows and DOS are identified inside the script
as %1, %2 etc. Up to a maximum of 10 I think, then you have to use the
'shift' command.
The script sets other values such as %OUTPUT% internally. Here is the full
script (ffmpeg command not yet updated for presets etc.). Hopefully this
will give you some idea of how the script uses command line parameters as
well as the time-stamping commands.
This may not work as is for you esp. when specifying subtitles, in which
case the script uses Avisynth to inlay them. If you set the external
environment variable FFMPDBUG to 'echo' before calling the script, i.e.
set FFMPDBUG=echo
the script prints what it would have done and exits.
---
@echo off
setlocal
goto INIT
:HELP
echo.
echo ffmpegencode v1.6 (c) F. Visagie 2012/08/24
echo Function: encode PAL DV to DVD-compliant MPEG-2
echo.
echo Usage:
echo ffmpegencode "infile" [bitrate ["subsfile"]] [pass]]]
echo.
echo where:
echo "infile" video file to encode
echo bitrate set video bitrate in bits/s (default %BITRATE%, max
%MAXRATE%)
echo "subsfile" ASS text script with inlay subtitles
echo pass nothing for uninterrupted 2-pass encoding
echo 1 for pass 1 only
echo 2 for pass 2 only
echo.
echo All value parameters accept 0 to indicate default/none
echo To ensure correct processing, double-quote space-separated filenames
echo Encoded output file is named infile%SUFFIX%
echo.
echo To display commands instead of executing for debugging purposes,
echo set external environment variable FFMPDBUG=echo, otherwise EMPTY
goto ERRPAUSE
rem Version History
rem v1.1 2009/05/20: added separate pass 1/2 support
rem v1.2 2009/05/20: removed Avisynth input for r19192 & later
rem v1.3 2009/09/04: restored Avisynth input for subtitle inlays
rem v1.4 2010/04/27: explicitly require quoted filenames, esp. for adding
subtitles
rem v1.5 2012/08/14: updated for ffmpeg version N-43418-g633b90c
rem added bitrate parameter
rem added copyright tag
rem added DEBUG flag
rem v1.6 2012/08/24: changed DEBUG flag to external environment variable
FFMPDBUG
rem removed built-in denoising
:INIT
rem Default encode settings
rem -----------------------
rem Production bitrates
set BITRATE=6090000
set MAXRATE=9000000
set MUXRATE=10080000
rem Bitrates for testing
rem Following bitrate causes buffer underflow and MuxMan P-STD buffer
underflow (with -maxrate 9800000)
rem set BITRATE=9000000
rem set MAXRATE=9800000
rem Following muxrate leaves enough room for audio and triggers buffer
underflow for illegal video
rem set MUXRATE=9928000
set PSNR=
rem set PSNR=-psnr
set SUFFIX=.mpg
set METADATA=-metadata copyright="Encode (c) Francois Visagie
francois.visagie at gmail.com"
set INPUT=
set PASSOPT=
set SUBSFILE=
REM Parse input file
if [%1] == [] goto HELP
if [%1] == [?] goto HELP
if [%1] == [-?] goto HELP
if [%1] == [/?] goto HELP
if [%1] == [h] goto HELP
if [%1] == [-h] goto HELP
if [%1] == [/h] goto HELP
if [%1] == [help] goto HELP
if [%1] == [-help] goto HELP
if [%1] == [/help] goto HELP
rem Preserve input filename
set INPUT=%1
if exist %1. goto QUOTIN
echo.
echo Invalid input file %1!
echo HINT: If it contains spaces, enclose input filename in quotes
:ERRPAUSE
echo
echo.
pause
goto EXIT
:QUOTIN
rem Ensure input file name quoted
echo %INPUT% | find """" > NUL
if not errorlevel 1 goto CHKBIT
set INPUT="%INPUT%"
:CHKBIT
if [%2] == [] goto CHKOUT
if [%2] == [0] goto CHKSUBS
set BITRATE=%2
:CHKSUBS
if [%3] == [] goto CHKOUT
if [%3] == [0] goto CHKPASS
if exist %3. goto QUOTSUBS
echo.
echo Invalid subtitle file %3!
echo HINT: If it contains spaces, enclose subtitle filename in quotes
goto ERRPAUSE
:QUOTSUBS
rem Ensure subtitle file name quoted
set SUBSFILE=%3
echo %SUBSFILE% | find """" > NUL
if not errorlevel 1 goto CHKPASS
set SUBSFILE="%SUBSFILE%"
:CHKPASS
if [%4] == [] goto CHKOUT
if [%4] == [1] goto SETPASS1
if [%4] == [2] goto SETPASS2
echo.
echo Invalid pass number %4!
goto ERRPAUSE
:SETPASS1
set PASSOPT=1
goto CHKOUT
:SETPASS2
set PASSOPT=2
:CHKOUT
rem Now we're committed and may over-write output file
set OUTPUT=%INPUT%%SUFFIX%
if not exist %OUTPUT%. goto MAIN
echo
echo.
echo %OUTPUT% already exists!
echo Press Ctrl-C to abort, else
echo.
pause
goto MAIN
:MISSFILE
set MISSMESG=Missing pass 1 file (ffmpeg2pass-?.log
if not [%SUBSFILE%] == [] set MISSMESG=%MISSMESG% or %AVSCRIPT%
set MISSMESG=%MISSMESG%)!
echo.
echo %MISSMESG%
goto ERRPAUSE
:MAIN
set FFINPUT=%INPUT%
rem Use distinct variable for AVS script to protect input file from
accidental deletion
set AVSCRIPT=
if [%SUBSFILE%] == [] goto CHKPASS#
set FFINPUT=%INPUT%.AVS
set AVSCRIPT=%FFINPUT%
:CHKPASS#
if [%PASSOPT%] == [2] goto ENDPASS
set PASS=1
set VB_STRAT=-b_strategy 1
if not [%FFMPDBUG%] == [echo] if exist ffmpeg2pass-?.log del
ffmpeg2pass-?.log
if [%SUBSFILE%] == [] goto LOGSTART
echo OpenDMLSource(%INPUT%)>%AVSCRIPT%
echo TextSub(%SUBSFILE%)>>%AVSCRIPT%
if not [%FFMPDBUG%] == [echo] goto LOGSTART
echo.
echo %AVSCRIPT%:
echo.
type %AVSCRIPT%
echo.
del %AVSCRIPT%
:LOGSTART
if [%FFMPDBUG%] == [echo] goto ENCODE
echo Start %INPUT% >%OUTPUT%.time.txt
:BEGNPASS
if [%FFMPDBUG%] == [echo] goto ENCODE
echo Start pass %PASS% >>%OUTPUT%.time.txt
echo. | date | find /v "Enter the new date: (yy-mm-dd)" >>%OUTPUT%.time.txt
echo. | time | find /v "Enter the new time:" >>%OUTPUT%.time.txt
:ENCODE
REM MEncoder reference command line
rem mencoder -field-dominance 1 -mc 0 -vf hqdn3d=2:1:2,harddup -oac lavc
-ovc lavc -lavcopts
abitrate=128:acodec=ac3:autoaspect:ilme:ildct:keyint=15:mbd=2:top=0:trell:vb
itrate=%BITRATE%:vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vstric
t=0%PSNR%:vmax_b_frames=2%VB_STRAT%:dia=2:preme=2:predia=2:mbcmp=6:precmp=2:
cmp=2:subcmp=6:last_pred=2:mv0:mv0_threshold=0 -of mpeg -mpegopts
format=dvd:muxrate=%MUXRATE%:tsaf %1 -o %OUTPUT% >%OUTPUT%.%PASS%.txt
REM Fast test encode
rem ffmpeg -y -i %FFINPUT% -target pal-dvd -acodec ac3 -ab 128000 -flags
ildct+ilme -maxrate %MAXRATE% -vcodec mpeg2video -b:v %BITRATE% -pass %PASS%
%OUTPUT%
%FFMPDBUG% ffmpeg -y -top 0 -async 0 -i %FFINPUT% -aspect 4:3 -target
pal-dvd -muxrate %MUXRATE% -acodec ac3 -ab 128000 -flags ildct+ilme+mv0 -g
15 -mbd 2 -trellis 1 -bufsize 1835000 -strict 0 -bf 2 %VB_STRAT% -mbcmp 6
-preme 2 -precmp 2 -pre_dia_size 2 -cmp 2 -dia_size 2 -subcmp 6 -last_pred 2
-mv0_threshold 0 %PSNR% -maxrate %MAXRATE% -vcodec mpeg2video -b:v %BITRATE%
-pass %PASS% %METADATA% %OUTPUT%
if [%FFMPDBUG%] == [echo] goto CHKEND
echo End pass %PASS% >>%OUTPUT%.time.txt
echo. | date | find /v "Enter the new date: (yy-mm-dd)" >>%OUTPUT%.time.txt
echo. | time | find /v "Enter the new time:" >>%OUTPUT%.time.txt
:CHKEND
if %PASS% == 2 goto END
if [%PASSOPT%] == [1] goto END
:ENDPASS
if not [%FFMPDBUG%] == [echo] if not exist ffmpeg2pass-?.log goto MISSFILE
if not [%FFMPDBUG%] == [echo] if not [%SUBSFILE%] == [] if not exist
%AVSCRIPT%. goto MISSFILE
set PASS=2
set VB_STRAT=
goto BEGNPASS
:END
echo
rem pause
if [%PASSOPT%] == [1] goto EXIT
if exist ffmpeg2pass-?.log del ffmpeg2pass-?.log
if not [%SUBSFILE%] == [] if exist %AVSCRIPT%. del %AVSCRIPT%
:EXIT
set MUXRATE=
set MAXRATE=
set BITRATE=
set OUTPUT=
set PASS=
set PSNR=
set SUFFIX=
set METADATA=
set VB_STRAT=
set AVSCRIPT=
set SUBSFILE=
set PASSOPT=
set INPUT=
set FFINPUT=
set MISSMESG=
endlocal
---
> And what means 'Start pass' (not %Pass%)?
Start pass %PASS% writes to the text file 'Start pass 1' or 'Start pass 2'
(depending on value of %PASS%), to distinguish the timestamps of the two
passes.
>
> I tried it with replacing with setting the variables in the script.....
> and it shows me time, but only hh:mm:ss.
Mine shows "13:54:30.37". I can't be certain but the format is probably
specified in your computer's date and time settings.
>
> David
> >>> Carl Eugen
> >>>
> >>> _______________________________________________
> >>> ffmpeg-user mailing list
> >>> ffmpeg-user at ffmpeg.org
> >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >>>
> >> _______________________________________________
> >> ffmpeg-user mailing list
> >> ffmpeg-user at ffmpeg.org
> >> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> > _______________________________________________
> > ffmpeg-user mailing list
> > ffmpeg-user at ffmpeg.org
> > http://ffmpeg.org/mailman/listinfo/ffmpeg-user
> >
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
More information about the ffmpeg-user
mailing list