MP3 transcoding 320 to 128 or 112
Reply #10 – 2005-10-20 18:46:55
When you reduce the bit rate down to 112 or 128, would you lose noticeable quality such as in the highs? [a href="index.php?act=findpost&pid=335954"][{POST_SNAPBACK}][/a] :\> lame -b 320 Using polyphase lowpass filter, transition band: 20094 Hz - 20627 Hz :\> lame -b 128 Using polyphase lowpass filter, transition band: 16538 Hz - 17071 Hz :\> lame --abr 128 Using polyphase lowpass filter, transition band: 16538 Hz - 17071 Hz As you can see, there is a filter with a lower transition band, so yes, it filters high frequencies, but 17Khz is quite high. Listen to it and decide if it satisfies you.I understand that going from lossy to lossy is not recommended and that transcoding is even worse? Is this conversion (320 > 112 or 128) going to give me horrible results and will it be that noticeable? [a href="index.php?act=findpost&pid=335963"][{POST_SNAPBACK}][/a] Just to clarify: converting from lossy to lossy is a type of transcoding. In fact, the most used definition. Transcoding adds artifacts because the (hopefully unhearable) differences between the lossy and the original can be amplified or simply make other deficiencies more apparent. Said that, transcoding is generally accepted from high bitrates to low bitrates because the artifacts that the transcoding adds, are generally less than those caused by the low bitrate.Transcoding from a lossy format to a lossy format will result in files of terrible quality. [a href="index.php?act=findpost&pid=335968"][{POST_SNAPBACK}][/a] That is quite a hard comment. Do not take extremist positions. This is not a perfect/disastrous debate. It is lossy files afterall, and even more, it is for a portable.However, it all depends if you can hear the difference between a 320kbps mp3 and a transcoded 112kbps mp3. [a href="index.php?act=findpost&pid=335968"][{POST_SNAPBACK}][/a] I think it depends more about being able to hear the difference between 320kbps MP3 and non-transcoded 112kbps MP3. The artifacts from the transcoding, generally ( not always ), would be less than the ones by that low bitrate.