faac does not seem to respect bitrate
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faac does not seem to respect bitrate
 
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It seems that faac does not always the requested respect bitrates. I
have tested this on my Windows machine (using the WinBuilds) by converting a 128kbps mp3 to several mp4 files with different bitrates: gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=16000 ! mp4mux ! filesink location=16.mp4 gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=32000 ! mp4mux ! filesink location=32.mp4 gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=64000 ! mp4mux ! filesink location=64.mp4 gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=128000 ! mp4mux ! filesink location=128.mp4 gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=256000 ! mp4mux ! filesink location=256.mp4 gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac bitrate=320000 ! mp4mux ! filesink location=320.mp4 The resulting filesizes show the issue: 29/01/2010 12:57 <DIR> . 29/01/2010 12:57 <DIR> .. 29/01/2010 12:55 4.402.912 32.mp4 29/01/2010 11:57 5.071.153 kylie.mp3 29/01/2010 12:58 4.403.427 64.mp4 29/01/2010 12:59 5.164.493 128.mp4 29/01/2010 12:59 8.918.765 256.mp4 29/01/2010 13:00 8.918.881 320.mp4 29/01/2010 13:01 4.402.803 16.mp4 Is there a way to make it respect the requested bitrates? Grts, Francis ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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On 29.01.2010 15:06, Francis Rammeloo wrote:
> It seems that faac does not always the requested respect bitrates. I > have tested this on my Windows machine (using the WinBuilds) by > converting a 128kbps mp3 to several mp4 files with different bitrates: > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=16000 ! mp4mux ! filesink location=16.mp4 > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=32000 ! mp4mux ! filesink location=32.mp4 > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=64000 ! mp4mux ! filesink location=64.mp4 > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=128000 ! mp4mux ! filesink location=128.mp4 > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=256000 ! mp4mux ! filesink location=256.mp4 > > gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac > bitrate=320000 ! mp4mux ! filesink location=320.mp4 > > > The resulting filesizes show the issue: > > 29/01/2010 12:57 <DIR> . > 29/01/2010 12:57 <DIR> .. > 29/01/2010 12:55 4.402.912 32.mp4 > 29/01/2010 11:57 5.071.153 kylie.mp3 > 29/01/2010 12:58 4.403.427 64.mp4 > 29/01/2010 12:59 5.164.493 128.mp4 > 29/01/2010 12:59 8.918.765 256.mp4 > 29/01/2010 13:00 8.918.881 320.mp4 > 29/01/2010 13:01 4.402.803 16.mp4 > > > Is there a way to make it respect the requested bitrates? > need a batch file or a special shell command), then look at the file sizes (sorted by bitrate you've used). My prediction is that you'll see that filesize(bitrate) function is monotonely rising, but will do that by leaping at some points instead of raising steadily. ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: faac does not seem to respect bitrate
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2010/1/29 LRN <[hidden email]>:
> On 29.01.2010 15:06, Francis Rammeloo wrote: >> It seems that faac does not always the requested respect bitrates. I >> have tested this on my Windows machine (using the WinBuilds) by >> converting a 128kbps mp3 to several mp4 files with different bitrates: >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=16000 ! mp4mux ! filesink location=16.mp4 >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=32000 ! mp4mux ! filesink location=32.mp4 >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=64000 ! mp4mux ! filesink location=64.mp4 >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=128000 ! mp4mux ! filesink location=128.mp4 >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=256000 ! mp4mux ! filesink location=256.mp4 >> >> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >> bitrate=320000 ! mp4mux ! filesink location=320.mp4 >> >> >> The resulting filesizes show the issue: >> >> 29/01/2010 12:57 <DIR> . >> 29/01/2010 12:57 <DIR> .. >> 29/01/2010 12:55 4.402.912 32.mp4 >> 29/01/2010 11:57 5.071.153 kylie.mp3 >> 29/01/2010 12:58 4.403.427 64.mp4 >> 29/01/2010 12:59 5.164.493 128.mp4 >> 29/01/2010 12:59 8.918.765 256.mp4 >> 29/01/2010 13:00 8.918.881 320.mp4 >> 29/01/2010 13:01 4.402.803 16.mp4 >> >> >> Is there a way to make it respect the requested bitrates? >> > Try encoding kylie.mp3 with 1,2,3,4,5,6,7,8,9...318,319,320 kbps (you'll > need a batch file or a special shell command), then look at the file > sizes (sorted by bitrate you've used). My prediction is that you'll see > that filesize(bitrate) function is monotonely rising, but will do that > by leaping at some points instead of raising steadily. > I believe what you're saying. In my samples you can also see the filesizes raising. However it's not reasonable: the original file encoded at 128k takes 5 MB, the aac encoded one at 32k takes 4 MB. I should be around 1 to 2 MB. Grts, Francis > ------------------------------------------------------------------------------ > The Planet: dedicated and managed hosting, cloud storage, colocation > Stay online with enterprise data centers and the best network in the business > Choose flexible plans and management services without long-term contracts > Personal 24x7 support from experience hosting pros just a phone call away. > http://p.sf.net/sfu/theplanet-com > _______________________________________________ > gstreamer-devel mailing list > [hidden email] > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: faac does not seem to respect bitrate
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Francis Rammeloo wrote: > 2010/1/29 LRN <[hidden email]>: >> On 29.01.2010 15:06, Francis Rammeloo wrote: >>> It seems that faac does not always the requested respect bitrates. I >>> have tested this on my Windows machine (using the WinBuilds) by >>> converting a 128kbps mp3 to several mp4 files with different bitrates: >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=16000 ! mp4mux ! filesink location=16.mp4 >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=32000 ! mp4mux ! filesink location=32.mp4 >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=64000 ! mp4mux ! filesink location=64.mp4 >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=128000 ! mp4mux ! filesink location=128.mp4 >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=256000 ! mp4mux ! filesink location=256.mp4 >>> >>> gst-launch-0.10 filesrc location=kylie.mp3 ! decodebin2 ! faac >>> bitrate=320000 ! mp4mux ! filesink location=320.mp4 >>> >>> >>> The resulting filesizes show the issue: >>> >>> 29/01/2010 12:57 <DIR> . >>> 29/01/2010 12:57 <DIR> .. >>> 29/01/2010 12:55 4.402.912 32.mp4 >>> 29/01/2010 11:57 5.071.153 kylie.mp3 >>> 29/01/2010 12:58 4.403.427 64.mp4 >>> 29/01/2010 12:59 5.164.493 128.mp4 >>> 29/01/2010 12:59 8.918.765 256.mp4 >>> 29/01/2010 13:00 8.918.881 320.mp4 >>> 29/01/2010 13:01 4.402.803 16.mp4 >>> >>> >>> Is there a way to make it respect the requested bitrates? >>> >> Try encoding kylie.mp3 with 1,2,3,4,5,6,7,8,9...318,319,320 kbps (you'll >> need a batch file or a special shell command), then look at the file >> sizes (sorted by bitrate you've used). My prediction is that you'll see >> that filesize(bitrate) function is monotonely rising, but will do that >> by leaping at some points instead of raising steadily. >> > > I believe what you're saying. In my samples you can also see the > filesizes raising. However it's not reasonable: the original file > encoded at 128k takes 5 MB, the aac encoded one at 32k takes 4 MB. I > should be around 1 to 2 MB. > Basically see bug https://bugzilla.gnome.org/show_bug.cgi?id=606726, along with appropriately recent faac, etc Mark. ------------------------------------------------------------------------------ The Planet: dedicated and managed hosting, cloud storage, colocation Stay online with enterprise data centers and the best network in the business Choose flexible plans and management services without long-term contracts Personal 24x7 support from experience hosting pros just a phone call away. http://p.sf.net/sfu/theplanet-com _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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