[FFmpeg-user] ffmpeg multi threading
shacky83 at gmail.com
Wed Apr 27 08:43:31 CEST 2011
Thank you very much for your answer.
I've never used the libx264 codec, so I'm looking to its options.
I tried your command but I got the "Unrecognized option 'preset'" error.
I tried to remove the -presets parameter but I got this error:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Error while opening encoder for output stream #0.0 - maybe incorrect parameters
such as bit_rate, rate, width or height
Could you help me please?
2011/4/26 Lou <lou at fakeoutdoorsman.com>:
> On Tue, 26 Apr 2011 16:52:27 +0200
> shacky <shacky83 at gmail.com> wrote:
>> I'm using ffmpeg on my Windows machine to convert some videos from TS
>> to FLV. I have a quadcore processor and I'm making some benchmark to
>> have the conversion process as fast as possible.
>> I'm using the binary win32 static version of ffmpeg from
> Newer Windows builds are located here:
>> The command I use to convert from TS to FLV is the following:
>> C:\Record\tv>c:\utils\ffmpeg-r26400\bin\ffmpeg.exe -i myfile.ts -y -f
>> flv -s 320x240 -b 464k -ac 2 -ar 22050 -ab 48k myfile.flv
>> But if I try to add the -threads 2 or -threads 4 parameter I get this
>> Error while opening encoder for output stream #0.0 - maybe incorrect
>> parameters such as bit_rate, rate, width or height
>> so I'm thinking that ffmpeg is not using all available cores of my
>> Could you help me please?
>> Thank you very much!
> flv (the encoder, not the container) does not support multithreaded
> Use libx264 if you want to output to flv and have multithreaded
> encoding. Example:
> ffmpeg -i input -vcodec libx264 -preset medium -crf 24 -threads 0 \
> -vf scale=320:-1 -acodec libmp3lame -ar 44100 -aq 5 output.flv
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