[FFmpeg-user] XvidExpert needed for "transcoding" xml into ffmpeg parameters

[David Wagner]

Am 12.09.2012 21:01, schrieb Andy Civil:
> On 2012-09-11 8:08 AM, David Wagner wrote:
>> Hey,
>>
>> I have this xml and need it convertet into parameter for ffmpeg. But 
>> how in the
>> hell shall I find all the right commands in ffmpeg?
>> I don't have the time and the knowledge to for doing that. Is there 
>> anyone who
>> really knows the parameter conversion. I tried some GUIs but they all 
>> produced
>> nothing of worth.
>
> I'm not an "expert" but I'm hoping that if I start with the parameters 
> I understand, people will add or correct any I miss.
>
> Many of the lines in this are irrelevant. They are formalities such as 
> "Name", or they're defining things as not applying in this case, such 
> as QPel (false). Yet others simply control the way the coder works, 
> e.g. Turbo (false). Yet others are options; only one FourCC can be in 
> any file, and the XML gives four! Even further, some options are 
> plainly silly: if interlacing is "false" then we don't need to know 
> that "bottom field first" is "true" - LOL
>
>
> I will translate the options that I think you actually need:
>
>>
>> <?xml version="1.0"?>
>> <VideoProfile xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
>> xmlns:xsd="http://www.w3.org/2001/XMLSchema">
>> <Name>XviD_Default</Name>
>> <Settings xsi:type="xvidSettings">
> -c:v libxvid
>
>> <EncodingMode>3</EncodingMode>
>> <BitrateQuantizer>700</BitrateQuantizer>
>> <KeyframeInterval>300</KeyframeInterval>
> -g 300
>
>> <NbBframes>2</NbBframes>
> -bf 2
>
>> <MinQuantizer>3</MinQuantizer>
> -qmin 3
>
>> <MaxQuantizer>5</MaxQuantizer>
> -qmax 5
>
>> <Turbo>false</Turbo>
>> <V4MV>false</V4MV>
>> <QPel>false</QPel>
>> <Trellis>true</Trellis>
> -trellis 2
>
>> <CreditsQuantizer>12</CreditsQuantizer>
>> <FourCCs>
>> <string>XVID</string>
>> <string>DIVX</string>
>> <string>DX50</string>
>> <string>MP4V</string>
>> </FourCCs>
> -vtag XVID
>
>> <Logfile>.stats</Logfile>
>> <CustomEncoderOptions />
>> <FourCC>0</FourCC>
>> <Zones />
>> <MaxNumberOfPasses>2</MaxNumberOfPasses>
> If you want two pass encoding then you should read up about it; 
> basically you do it twice, first with "-pass 1" then with "-pass 2" 
> but it's ONLY relevant if you're trying to squeeze into a certain size 
> (e.g. fit on a CD).
>
>> <NbThreads>1</NbThreads>
> -threads 1
>
>> <MotionSearchPrecision>6</MotionSearchPrecision>
> -dia_size 6
>
>> <VHQMode>1</VHQMode>
>> <QuantType>2</QuantType>
>> <MinPQuant>1</MinPQuant>
>> <MaxPQuant>31</MaxPQuant>
>> <MinBQuant>1</MinBQuant>
>> <MaxBQuant>31</MaxBQuant>
>> <BQuantRatio>150</BQuantRatio>
>> <BQuantOffset>100</BQuantOffset>
>> <KeyFrameBoost>10</KeyFrameBoost>
>> <KeyframeThreshold>1</KeyframeThreshold>
>> <KeyframeReduction>20</KeyframeReduction>
>> <OverflowControlStrength>5</OverflowControlStrength>
>> <MaxOverflowImprovement>5</MaxOverflowImprovement>
>> <MaxOverflowDegradation>5</MaxOverflowDegradation>
>> <HighBitrateDegradation>0</HighBitrateDegradation>
>> <LowBitrateImprovement>0</LowBitrateImprovement>
>> <ReactionDelayFactor>16</ReactionDelayFactor>
>> <AveragingPeriod>100</AveragingPeriod>
>> <FrameDropRatio>0</FrameDropRatio>
>> <RateControlBuffer>0</RateControlBuffer>
>> <VbvPeakRate>0</VbvPeakRate>
>> <VbvMaxRate>0</VbvMaxRate>
>> <VbvBuffer>0</VbvBuffer>
>> <altpass2>false</altpass2>
>> <PackedBitstream>false</PackedBitstream>
>> <GMC>false</GMC>
>> <NoChromaMotion>false</NoChromaMotion>
>> <NoClosedGOP>false</NoClosedGOP>
>> <VHQForBframes>true</VHQForBframes>
>> <AdaptiveQuant>true</AdaptiveQuant>
>> <Greyscale>false</Greyscale>
>> <Interlaced>false</Interlaced>
>> <BottomFieldFirst>true</BottomFieldFirst>
>> <LumiMasking>false</LumiMasking>
>> <Width>false</Width>
>> <BframeThreshold>0</BframeThreshold>
>> <muxing>auto</muxing>
>> <CustomQuantizerMatrix></CustomQuantizerMatrix>
>> </Settings>
>> </VideoProfile>
>
> The other options that I generally use for XVID are
> -mbd rd -flags +mv4+aic -cmp 2 -subcmp 2
> and also
> -vb 1500k
> which sets the bitrate.
>
> Hope this helps. What about audio?
>

Thank you very much. Unfortunately  I  now used the command line utility 
XvidEncraw which took me 5 minutes, as it has almost all of the 
parameters as default settings and his paramterlist as a xvid only 
encoder gives it a high usability mark. But perhaps I will  integrate it 
into my program if I have the time. Perhaps it makes sense so see which 
are the default parameters set by ffmpeg. Do you know  how I can read 
out the default parameters of an ffmpeg encoder so I can see which 
parameter I need to change and which not?

David