hno Posted April 12, 2014 Share Posted April 12, 2014 HI every one . This is how I convert videoes to flv but the quality is decreasing very much . passthru("$ffmpegpath -i uploads/$video_name -ar 22050 -ab 32k -f flv -s 480x800 uploads/vid.flv"); How can I convert videos without any decrease of quality ? Thanks Quote Link to comment Share on other sites More sharing options...
QuickOldCar Posted April 12, 2014 Share Posted April 12, 2014 (edited) Don't you set what encoder to use? You can try setting the bitrate to somewhere around -b 400k , and see how it does. If neither -b:v nor -crf are set, the encoder will use a low default bitrate and your result will probably be poor. Always supply one of these options—ideally both. If this helps you at all, I created a casting script in linux that returns extremely nice quality. Granted I capture my screen and send this to a host, but you can modify it and also save as file. I guess one reason am showing you this is to show that default is not always best, should have more parameters and tell it exactly what you want as a result. #!bin/bash #settings can adjust #list of stream hosts SecureSaw="rtmp://flash.sawlive.tv:2139/flash/stream_key"; Saw="rtmp://publish.sawlive.tv/flash/stream_key"; JTV="rtmp://live.justin.tv/app/stream_key"; Ucaster="rtmp://ucaster.eu/live/username?key=stream_key"; Mips="rtmp://mips.tv/live/username?key=stream_key&id=id"; Ustream="rtmp://1.16711620.fme.ustream.tv/ustreamVideo/stream_key"; Zecast="rtmp://live.zecast.tv/zecast/username";#http://zecast.tv/channel.php?id=username Veemi="rtmp://live.veemi.com/live?u=username&p=stream_key/username";#http://www.veemi.com/watch?v=username Cast7="rtmp://xxx.cast7.eu/onlive?key=stream_key/username";#http://cast7.eu/index/stream/name/username&sid=id #select which stream host to use StreamHost="$SecureSaw"; #video capture in and out #keep in 8px increments or makes encoder do lots of extra work VideoInWidth="1024" VideoInHeight="768" VideoOutWidth="1024" VideoOutHeight="768" WidthOffset="0" HeightOffset="0" #video cropping CropTotalWidth="1024" CropTotalHeight="576" WidthCrop="0" HeightCrop="104" VideoFramesPerSecond="30" #suggest 24-30 VideoQuality="10" # suggest 10-30 , range is 0-68 , lower number is better quality KeyFrames="2" #suggest 1-2 NumberAudioChannels="2" #suggest 2 stereo , 1 mono NumberCPUcores="4" #count your logical cores VideoBitrate="450k" #try 500k ,varies your upload speed and quality of video/audio sending AudioBitrate="96k" #suggest 64,96,128 #STOP RIGHT THERE!!! #you should not change anything below unless know what they all do VideoInResolution="$VideoInWidth"x"$VideoInHeight" VideoOutResolution="$VideoOutWidth"x"$VideoOutHeight" avconv \ -f x11grab -y -s "$VideoInResolution" -g "$KeyFrames" -r:v "$VideoFramesPerSecond" -i :"$WidthOffset"."$HeightOffset" \ -f alsa -ac "$NumberAudioChannels" -i pulse -vol 1024 \ -c:a libmp3lame -ar 44100 -threads "$NumberCPUcores" \ -b:a "$AudioBitrate" \ -c:v libx264 -pix_fmt yuv420p -vsync 1 -crf "$VideoQuality" -s "$VideoOutResolution" \ -vf crop="$CropTotalWidth":"$CropTotalHeight":"$WidthCrop":"$HeightCrop" \ -b:v "$VideoBitrate" -minrate "$VideoBitrate" -maxrate "$VideoBitrate" -bufsize "$VideoBitrate" \ -y -f flv "$StreamHost" \ Edited April 12, 2014 by QuickOldCar Quote Link to comment Share on other sites More sharing options...
hno Posted April 13, 2014 Author Share Posted April 13, 2014 Thanks for the reply Could someone please give me a code for converting videos to x264 ? I've tested several codes but non of the worked . Thanks Quote Link to comment Share on other sites More sharing options...
QuickOldCar Posted April 13, 2014 Share Posted April 13, 2014 Take a look here, explains and shows example codes, it really depends what the purpose is. https://trac.ffmpeg.org/wiki/x264EncodingGuidehttps://trac.ffmpeg.org/wiki/x264EncodingGuide Is a lot of older ffmpeg codes out there, they were changed a few years ago. ffmpeg -i input -vcodec libx264 -preset fast -tune film -profile main -crf 22 -threads 0 output Quote Link to comment Share on other sites More sharing options...
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