How to change profile to transcode 5.1 AAC to 5.1 AC3 for Samsung C750 or HT-C6500

[glen8]

Hi all,

Sheesh!! Talk about jumping through Hoops lol

I hope someone will be able to help me. My movie collection consists of a large number of .MP4 files encoded to H264/AAC5.1. The issue I have is that the Samsung TV and the Sound system will accept the movies ok but I only get PCM 2.0.
Both support AC3 5.1 so I was wondering about using Mezzmo to transcode the audio on the fly and get full surround sound.

Now....I have downloaded the trial version, scanned my media and got both devices talking to it. Reading on another thread I found a piece of code to put in one of the profiles to do the transcoding. Problem I have is....

Both Media Devices have a default profile of SamsungC.prf or SamsingHTS.prf. None of these profiles can be located in the Profiles folder. Thinking of a way around this I decided to edit the SamsungA.prf instead but I keep getting either a read only error or Access Denied. Tried through CMD as Administrator, attrib -h -r -s -a for good measure but still can't change the Profiles. The service was in a stopped state so no idea how others seem to edit their profiles and I can't. Windows 7 issue?

Would someone please help me with a) understanding the profile structure b) getting the files changed c) getting the right code in for transcoding

[Paul]

Hi,

The "Samsung C" device profile is "SamsungLA.prf", "Samsung HTS" device profile is "SamsungHT.prf".

You'll need to right-click on those files in Windows Explorer and remove the read-only attribute before editing them.

Regarding that change to transcoding - if the input file is AAC 5.1, it should be transcoded to AC3 5.1 by default, so you shouldn't need to adjust anything in the device profiles. Please confirm that you have "Samsung C" and "Samsung HTS" selected in your Media Devices dialog, just to be sure that we're looking at the same profiles.

Can you please post FFmpeg information on one of those files (in Mezzmo right-click on the file and use the "Get FFmpeg Information" command) and we'll start looking at what may be happening.

[glen8]

Thanks I'll try it again and see what happens

Here's the info anyway

ffmpeg version N-31788-g0d4ea7b, Copyright (c) 2000-2011 the FFmpeg developers
built on Aug 10 2011 11:16:35 with gcc 4.4.2
configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-mingw32- --enable-static --disable-shared --enable-zlib --disable-ffplay --prefix=/media/windows/ffmpeg --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --pkg-config=pkg-config
libavutil 51. 11. 1 / 51. 11. 1
libavcodec 53. 10. 0 / 53. 10. 0
libavformat 53. 6. 0 / 53. 6. 0
libavdevice 53. 2. 0 / 53. 2. 0
libavfilter 2. 28. 1 / 2. 28. 1
libswscale 2. 0. 0 / 2. 0. 0
libpostproc 51. 2. 0 / 51. 2. 0
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Movies\X-Men Collection\X-Men - The Last Stand (2006).mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2010-09-03 02:19:36
Duration: 01:44:05.31, start: 0.000000, bitrate: 6002 kb/s
Chapter #0.0: start 0.000000, end 317.192000
Metadata:
title :
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Metadata:
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Metadata:
title :
Stream #0.0(und): Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 5680 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc
Metadata:
creation_time : 2010-09-03 02:19:36
Stream #0.1(eng): Audio: aac, 48000 Hz, 5.1(back), s16, 317 kb/s
Metadata:
creation_time : 2010-09-03 02:22:10
At least one output file must be specified


---> DB Level Info: 40, 100
---> Frame rate: 23.98
---> Aspect ratio: 16:9

[glen8]

Update

HT-C6500

Plays MP4 (H264/AAC) Movies ok but not in 5.1
Plays MP4 (H264/AC3) Movies ok and in 5.1

C750 TV

Unsupported Format (plays them fine natively, ie through USB or Twonky)

It's the HT-C6500 I'm really bothered about

Tonight I managed to edit the HT profile and entered the following settings

<avcontainer id="mov,mp4,m4a,3gp,3g2,mj2" name="h264aac" format="mp4" encode="1" mimetype="video/m4v">
<video>
<format id="h264" encode="1" codec="libx264" preferredtranscoded="1">
<copyts>1</copyts>
<samequality>1</samequality>
<bitrate>25000000</bitrate>
</format>
</video>
<audio>
<format id="ac3" encode="1" codec="ac3" preferredtranscoded="1">
<channels>2</channels>
<channels>6</channels>
<bitrate>448000</bitrate>
<maxbitrate>448000</maxbitrate>
<minbitrate>64000</minbitrate>
<samplingrate>48000</samplingrate>
</format>
</audio>
<audio>
<format id="aac" encode="0" codec="aac">
<channels>2</channels>
</format>
</audio>
<ffmpegadditional>-threads 4 -coder 1 -flags +loop -cmp +chroma -me_method hex -subq 6 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -bf 3 -refs 2 -directpred 1 -trellis 1 -flags2 +bpyramid+mixed_refs+wpred+dct8x8+fastpskip -wpredp 2</ffmpegadditional>
</avcontainer>

Now the HT-C6500 plays MP4 movies in AC3 5.1 :-) Excellent!! However.....the transcoded file sitting on the PC is growing at an alarming rate. So much so that after only a few mins it was well past 5GB (the source movie is only 4GB). The issue with this is that playing the movie is very choppy. Do we have to encoding the video as well as the audio? I'm thinking the answer here will be yes due to lip sync? is that correct?

What I'm trying to achieve is minimal transoding but having 5.1

Thanks!

[Paul]

Another way to do this is to revert back to the original device profile ("Samsung HTS", I assume) and then just change the MP4 container to be like this (basically adding the constraint of stereo AAC):



<avcontainer id="mov,mp4,m4a,3gp,3g2,mj2" name="h264aac" encode="0" mimetype="video/mp4" supportschunked="0">
<video>
<format id="h264" encode="0">
</format>
</video>
<video>
<format id="mpeg4" encode="0">
</format>
</video>
<audio>
<format id="aac" encode="0">
<channels>2</channels>
</format>
</audio>
<audio>
<format id="pcm_s16le" encode="0">
</format>
</audio>
</avcontainer>


This will go back to the default MKV h264/AC3 encoding that should produce good results.

Also, if you'd like to keep your transcoding, try changing "samequality" to 0 - this should reduce the file size.

I'd also recommend the following "ffmpegadditional" parameter:



<ffmpegadditional>-threads 4 -pix_fmt yuv420p -copyinkf -coder 1 -flags +loop -fflags +genpts -cmp +chroma -me_method hex -subq 7 -me_range 16 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -directpred 1 -flags2 +fastpskip+bpyramid+mixed_refs-dct8x8+wpred+aud+ivlc+mbtree -partitions -parti8x8-parti4x4-partp8x8-partp4x4-partb8x8 -crf 22 -bf 1 -refs 2 -bidir_refine 1 -deblockalpha 0 -deblockbeta 0</ffmpegadditional>