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Replay gain issue
sordup:
--- Quote from: saratoga on July 07, 2011, 01:55:33 PM ---
--- Quote from: sordup on July 07, 2011, 01:43:08 PM ---
--- Quote from: Buschel on July 01, 2011, 01:40:52 PM ---If I got you right you claim to loose Replaygain data when transcoding a file from A to B (B is of same format, but lower bitrate). Did you check the Replaygain data of those transcoded files in MediaMonkey?
For further analysis you might upload one of those files and the corresponding original somewhere. I could then take a closer look.
--- End quote ---
No. Transcoding from A to B, where A is a low bitrate to begin with. B may/may not be different format. Other transcodes (i.e. from higher bitrate and/or changing formats) works fine.
--- End quote ---
What about Buschel's main question? Do the transcoded tracks actually have replaygain information? If not, then no surprise Rockbox doesn't find it :) The bitrate part probably doesn't matter too much.
--- End quote ---
The transcoded tracks in question (i.e. the ones with the low bit rate issue outlined in my last post) do not have their gain info transferred to the device. It also seems to be that gain info from lower bit rate files that aren't transcoded doesn't transfer either(as in example at link). All other files, apparantly, transcoded or not, do have gain info transferred over.
Here is a link to a zip file containing two files, the original from my PC and its copy just transferred over to the DEVICE. The PC file has gain info, the DEVICE copy does not. This file is at a bit rate of 128. Most of my files are 160 or above and it is those that do not have this issue.
Link: https://docs.google.com/leaf?id=0B-AKDYBd2jIjMGM5YjI1YWMtNTM4Ny00ZTI3LWE2MDQtMDUxZDI3NzllYjZl&hl=en_US
Buschel:
Your "DEVICE" file does definately not contain any replay gain information, the "PC" files does. Nothing rockbox can do about this...
saratoga:
--- Quote from: sordup on July 09, 2011, 02:11:40 PM ---The transcoded tracks in question (i.e. the ones with the low bit rate issue outlined in my last post) do not have their gain info transferred to the device. It also seems to be that gain info from lower bit rate files that aren't transcoded doesn't transfer either(as in example at link).
--- End quote ---
Thats fairly common. Transcoding changes the gain slightly, so some programs don't transfer over the old replaygain values.
--- Quote from: sordup on July 09, 2011, 02:11:40 PM ---Here is a link to a zip file containing two files, the original from my PC and its copy just transferred over to the DEVICE.
--- End quote ---
The second file has no replaygain tag, but has had its volume adjusted by scaling the intermediate PCM values to the replaygain value, hence its actual replaygain value is very nearly 0dB (the difference probably being due to transcoding).
sordup:
OK. I think I see that maybe this is more of an issue with the transfer process from MediaMonkey, not RockBox. However, is it worth it to run another gain analyses once the tracks are on the device in order to try and further the attempt to make a fairly consistent playback level, or is this the best it gets at this point?
I am still having to maintain a close hand at the volume knob when playing back from RockBox due to the still prevalent volume differences (most noticeable when playing a random or shuffled playlist). This is not so when playing from PC with MediaMonkey.
saratoga:
--- Quote from: sordup on July 09, 2011, 03:40:09 PM ---Could you tell me if it's worth it to run another gain analyses once the tracks are on the device
--- End quote ---
You could do that, or get software that transfers the replaygain tags, or software that adjusts the volume while transcoding like the file you linked above.
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