[FFmpeg-user] ffmpeg ip cam stream with drawtext

[frhun]

if -c:v copy then not working drawtext!

only -c:v copy using the cpu usage 2-3% , it is working long ago
but now need use draw text on the video stream

so the drawtext re encoding do high cpu usage, I use the notebook ( 
thinkpad i5 3 generations) gpu is no to perfect :)

Robert

2019. 01. 30. 11:05 keltezéssel, Moritz Barsnick írta:
> On Wed, Jan 30, 2019 at 07:47:24 +0100, frhun wrote:
>> so I try lot of ffmpeg switch
>>
>> ffmpeg -r 25 -rtsp_transport tcp -i
>> rtsp://admin:1234@192.168.2.25/Streaming/Channels/1 -c:v libx264 -b:v 2M
>> -c:a copy -vf "[in]drawtext=fontfile='C\:\\Windows\\Fonts\\cour.ttf':
>> textfile='Z\:\\k\\v\\T_A\\P.txt': x=180: y=30: reload=1:
>> fontcolor=black: fontsize=50: box=1: boxborderw=5: boxcolor=red at 0.8 ,
>> drawtext=fontfile='C\:\\Windows\\Fonts\\cour.ttf':
>> textfile='Z\:\\k\\v\\T_A\\F.txt': x=180: y=75: reload=1:
>> fontcolor=black: fontsize=50: box=1: boxborderw=5: boxcolor=white at 0.8 ,
>> drawtext=fontfile='C\:\\Windows\\Fonts\\cour.ttf':
>> textfile='Z\:\\k\\v\\T_A\\O.txt': x=30: y=30: reload=1: fontcolor=black:
>> fontsize=60: box=1: boxborderw=5: boxcolor=aqua at 0.8 ,
>> drawtext=fontfile='C\:\\Windows\\Fonts\\cour.ttf':
>> textfile='Z\:\\k\\v\\T_A\\M.txt': x=30: y=80: reload=1: fontcolor=black:
>> fontsize=47: box=1: boxborderw=5: boxcolor=yellow at 0.8[out]" -preset
>> ultrafast -f flv rtmp://a.rtmp.youtube.com/live2/x-x-x-x
>>
>> I fixed the rate, and the output bitrate , and -preset utltrafast set
>>
>> cpu usage 50% down to 20% it is better but not enough
>> because i using 4 cameras, processor usage ~80% , I cooked my notebook...
>> How to go below cpu usage
> 
> How does this performance change if you omit all the filters, i.e. just
> RTSP demuxing/decoding and re-encoding to YouTube? (In other words: Do
> the filters "cook" your CPU, or is it the encoding?) Not with "-c:v
> copy, as in your original e-mail.
> 
> If the encoding is the bottleneck, you should try using your GPU for
> that.
> 
> Moritz
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