Search found 480 matches

by kawamoto76
Fri Apr 03, 2009 3:23 pm
Forum: Development
Topic: 5.1ch AC3 audio channel mapping plays irregular in 0.7.0RC3
Replies: 1
Views: 5982

5.1ch AC3 audio channel mapping plays irregular in 0.7.0RC3

Channel mapping function for 5.1 ch audio has been inproper in previos versions. As to mpeg file (video:mpeg2,audio:5.1chAC3), whatever mapping table is set even neutral set(from123456 to 123456) Mediacoder always convert audio from FL-C-FR-SL-SR-LFE to LFE-FL-C-FR-SL-SR. Then with channel number ex...
by kawamoto76
Mon Mar 30, 2009 10:50 am
Forum: Development
Topic: Gain control does not work in 0.7.0-rc2
Replies: 1
Views: 3004

Gain control does not work in 0.7.0-rc2

My mpeg file(mpeg2-AC3) have low audio loudness. I could change audio loudness with previous versions of 0.6.0. I tried to convert it to inclease audio volume with Mediacoder 0.7.0-rc2, setting also video and audio as "copy mode" and checking gain check box. But, no loudness change was not happens a...
by kawamoto76
Mon Mar 23, 2009 3:24 pm
Forum: Generic Discussions
Topic: How can I know Mediacoder versions released date
Replies: 1
Views: 3120

I want to know history of versions updated

Because 5.1ch audio handling(AAC-TS) seems to be varied from version to version.
I dont remember when I updated Mediacoder at every updates.
I have many mp4(H.264-AAC) files, and want to guess how 5.1ch audio are mapped
in the files to choice which I should repair.
by kawamoto76
Sun Mar 22, 2009 10:13 pm
Forum: Generic Discussions
Topic: How can I know Mediacoder versions released date
Replies: 1
Views: 3120

How can I know Mediacoder versions released date

I want to know released dates of verious Mediacoder versions.
In WIKI, I can know how Mediacoder has been improved.
But released dates are not descrived there.
Where I can know that.
by kawamoto76
Sun Mar 08, 2009 2:27 am
Forum: Development
Topic: Please check FAAD source, need silent audio data.
Replies: 0
Views: 2363

Please check FAAD source, need silent audio data.

I am converting 5.1ch TS(mpeg2-5.1chAAC-m2ts) into mp4(H.264-5.1chAAC-mp4) with Mediacoder. About some TS files from WOWOW(broadcasted in Japan), in the later part of the resultant mp4 file, the more audio proceed than video. One person said that faacDecDecode() in FAAD might have a bug. It might di...
by kawamoto76
Thu Mar 05, 2009 3:45 am
Forum: Development
Topic: 5.1ch Audio accelated in conversion from MPEG2-TS to mp4
Replies: 8
Views: 9792

Frame rate change detected, but ignored at stereo setting ?

demux_mpg reports the detection of bitrate change at either case, 5.1ch or stereo. But, it may be ignored at stereo case.
by kawamoto76
Thu Mar 05, 2009 3:21 am
Forum: Development
Topic: 5.1ch Audio accelated in conversion from MPEG2-TS to mp4
Replies: 8
Views: 9792

A hypothesis

WOWOW is broadcasted with 24Mbps bitrate. Star-Ch is broadcasted with 5-17Mbps(VBR). If only front left and right parts are decoded and encoded from 5.1ch(6ch) AAC input TS, CPU load may be lighter than that of when 6ch are fully decoded. Then, possibility mis-understanding as to frame-rate happens ...
by kawamoto76
Wed Mar 04, 2009 8:11 pm
Forum: Generic Discussions
Topic: How can I place FAAD decoder into selection menu
Replies: 0
Views: 2317

How can I place FAAD decoder into selection menu

For test trial to import external audio source , I splitted TS(mpeg1,AAC,m2ts) file into video(m2v) and audio(aac) with selecting taskmode as Demux(TSDemux). Got two file have not suffix, then I added .m2v to video file and .aac to audio file. And I was going to compare the result of conversion of t...
by kawamoto76
Wed Mar 04, 2009 7:40 pm
Forum: Generic Discussions
Topic: How treat 5.1ch audio when stereo output selected
Replies: 0
Views: 2451

How treat 5.1ch audio when stereo output selected

When transcodeing m2ts file(mpeg1video,5.1ch AAC audio) into mp4(H.264,stereo AAC), played sound volume seems to be lowered than original TS file.
I am not sure, stereo sounds L-R are made by downmixing of 5.1ch or by selecting only F-Left and F-Right.
Anyone knows whith is correct ?
by kawamoto76
Wed Mar 04, 2009 4:24 am
Forum: Development
Topic: 5.1ch Audio accelated in conversion from MPEG2-TS to mp4
Replies: 8
Views: 9792

Re write for correction

After further inspection, it was found it is not audio accelation but video slow down. Inspection was done about 3 bad 5.1ch TS files cut out from longer TS files over 2 hours . For example, bad 5.1ch TS file(length=237.5sec) is used as input source, resultant mp4(5.1ch) file length is 238.6sec. Whe...