To change the video quality here, you have the following options:Īdd the -crf option after -i in.mp4 with a value between 0 and 51, where lower means better quality. If that doesn't work, re-encode: ffmpeg -i in.mp4 -c:v libx264 -c:a aac -strict experimental -b:a 192K out.flv You might even have a chance to copy the bitstreams, which would mean no quality reduction at all. This would allow you to use H.264 video and AAC audio, which provide you with better quality at smaller file sizes when compared to the H.263 / MP3 variant in SWF files. with 192K.Ĭonsider converting your video to an FLV container instead, which will handle a larger variety of codecs than SWF (which only supports H.263, VP6 or Motion JPEG). This is a CBR setting, of course, and might result in lower visual quality per file size.Īdd the -q:a option for VBR MP3, with values between 0 and 7, 0 being the best quality.Īdd the -b:a option for CBR MP3, e.g. This is a VBR setting.Īdd the -b:v option with a bitrate, e.g. If you need to change the video quality, you have two options:Īdd the -qscale:v option after -i in.mp4 with a value from 1 to 31, where higher means lower quality (try with 2 or 3 first). This will default to converting the video to Sorenson Spark (H.263, or known as flv1) and the audio to MP3, using whatever MP3 encoder your FFmpeg has-probably libmp3lame. Basically, like this: ffmpeg -i in.mp4 out.swf
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