[FFmpeg-user] Transcode multicast IP video over ffmpeg

Đặng Đức Hưng ddhung at vasc.com.vn
Tue Apr 16 04:36:36 CEST 2013

Hi all.

I’m using your ffmpeg to transcode Multicast multicast UDP IP video input with 3.5 Mbps and codec is x264 to output with the the same input codec but low bit rate about 1.5Mbps. When I have done I found  the quality of image is very low, the image is often blured. I have read in the codec x264 there is a encoding mode which is pass 2 can improve the quality of the output image. Could you support for me the step by step to configure this pass 2 method. 

Here is the command line I am using:

C:/ffmpeg_32/bin/ffmpeg.exe -i udp:// -filter:v yadif=0:-1:1,fps=25 -vcodec libx264 -g 16 -vprofile main -level 30 -b:v 1050k -minrate 1000k -maxrate 1100k -bufsize 100k -s: 720x576 -r 25 -ac 2 -ar 48000 -b:a 128k -filter:a volume=2 -f mpegts -muxrate 1300k udp://

Thank you so much!

Best Regards

Đặng Đức Hưng

| Broadcast Technical Department | IPTV Center | VASC Software and Media Company |

| 33 Thai Ha Street | Đống Đa District | Hanoi | Vietnam|

| Tel (+84) 37722728 ext 681/684 | Mobile (+84) 915 070 921| 

|  <mailto:ddhung at vasc.com.vn> ddhung at vasc.com.vn |  <http://www.mytv.com.vn/> www.mytv.com.vn |


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