Question about matroska, DTS and transcoding

**sergos** · 03-24-2013, 08:39 PM

Hi all,
I have a question - what is the difference between the video stream in these two files:
File 1

Code:

C:\Program Files (x86)\Conceiva\Mezzmo\ffmpeg.exe -y -fflags +genpts -i "F:\Serials Incoming\Lost.S02.720p.BluRay.DTS.x264-CtrlHD\Lost.S02E01.720p.BluRay.DTS.x264-CtrlHD.mkv" -map 0:v:0 -map 0:a:0 -c:v:0 copy -level 41 -profile:v high -bsf:v h264_mp4toannexb -filter:v "yadif" -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 -b_strategy 1 -x264opts direct-pred=auto:b-pyramid=normal:mixed-refs=1:weightb=1:8x8dct=1:fast-pskip=1:crf=22:ref=2:bframes=3:aud=1 -partitions -parti8x8-parti4x4-partp8x8-partp4x4-partb8x8 -bidir_refine 1 -c:a:0 ac3_fixed -ac 6 -ab 640000 -ar 48000 -sn -threads 0 -async 0 -f mpegts "C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\4994-mpegts-libx264-ac3-sn.mzt"

ffmpeg version N-46003-gfa48da1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct 25 2012 12:37:27 with gcc 4.6.2 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc/include --extra-ldflags=-L/home/peter/cc/lib --pkg-config=pkg-config --disable-w32threads --enable-zlib
  libavutil      52.  0.100 / 52.  0.100
  libavcodec     54. 69.100 / 54. 69.100
  libavformat    54. 34.100 / 54. 34.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 20.105 /  3. 20.105
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
Input #0, matroska,webm, from 'F:\Serials Incoming\Lost.S02.720p.BluRay.DTS.x264-CtrlHD\Lost.S02E01.720p.BluRay.DTS.x264-CtrlHD.mkv':
  Metadata:
    title           : Lost - Season 2 Episode 1
    creation_time   : 2009-07-13 06:44:47
  Duration: 00:43:17.59, start: 0.000000, bitrate: 7202 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      title           : Lost - Season 2 Episode 1
    Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default)
    Metadata:
      title           : English
    Stream #0:2(eng): Subtitle: subrip
    Metadata:
      title           : English
Output #0, mpegts, to 'C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\4994-mpegts-libx264-ac3-sn.mzt':
  Metadata:
    title           : Lost - Season 2 Episode 1
    encoder         : Lavf54.34.100
    Stream #0:0(eng): Video: h264, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 23.98 fps, 90k tbn, 23.98 tbc (default)
    Metadata:
      title           : Lost - Season 2 Episode 1
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1, s16p, 640 kb/s (default)
    Metadata:
      title           : English
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (dca -> ac3_fixed)
Press [q] to stop, [?] for help

File 2

Code:

C:\Program Files (x86)\Conceiva\Mezzmo\ffmpeg.exe -y -i "F:\Serials Incoming\Lost.S03.720p.BluRay.DTS.x264-ESiR\Lost.S03E01.720p.BluRay.DTS.x264-ESiR.mkv" -map 0:v:0 -map 0:a:0 -c:v:0 libx264 -level 41 -profile:v high -filter:v "yadif" -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 -b_strategy 1 -x264opts direct-pred=auto:b-pyramid=normal:mixed-refs=1:weightb=1:8x8dct=1:fast-pskip=1:crf=22:ref=2:bframes=3:aud=1 -partitions -parti8x8-parti4x4-partp8x8-partp4x4-partb8x8 -bidir_refine 1 -c:a:0 ac3_fixed -ac 6 -ab 640000 -ar 48000 -sn -threads 0 -async 0 -f mpegts "C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\5024-mpegts-libx264-ac3-sn.mzt"

ffmpeg version N-46003-gfa48da1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct 25 2012 12:37:27 with gcc 4.6.2 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc/include --extra-ldflags=-L/home/peter/cc/lib --pkg-config=pkg-config --disable-w32threads --enable-zlib
  libavutil      52.  0.100 / 52.  0.100
  libavcodec     54. 69.100 / 54. 69.100
  libavformat    54. 34.100 / 54. 34.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 20.105 /  3. 20.105
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
Input #0, matroska,webm, from 'F:\Serials Incoming\Lost.S03.720p.BluRay.DTS.x264-ESiR\Lost.S03E01.720p.BluRay.DTS.x264-ESiR.mkv':
  Metadata:
    title           : Season 3, Episode 1: A Tale of Two Cities
    creation_time   : 2007-12-30 01:12:08
  Duration: 00:43:18.58, start: 0.000000, bitrate: 7199 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default)
[libx264 @ 02179520] using SAR=1/1
[libx264 @ 02179520] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 02179520] profile High, level 4.1
Output #0, mpegts, to 'C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\5024-mpegts-libx264-ac3-sn.mzt':
  Metadata:
    title           : Season 3, Episode 1: A Tale of Two Cities
    encoder         : Lavf54.34.100
    Stream #0:0(eng): Video: h264, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 90k tbn, 23.98 tbc (default)
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1, s16p, 640 kb/s (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (dca -> ac3_fixed)
Press [q] to stop, [?] for help

I ask this question because my TV does not support DTS and when i play such a file my changes to profile file make Mezzmo to transcode only the audio stream (File 1), but with the second file Mezzmo goes to transcode both streams (video and audio), the cause of which remains hidden from me.
Here are the changes in profile file for DTS:
LGTV2012.prf

Code:

<avcontainer id="matroska" name="matroska,webm" mimetype="video/x-matroska" encode="0" format="matroska" supportschunked="0" level="51">
		<video>
			<format id="mpeg4">
			</format>
			<format id="h264" videoprofile="100">
			</format>
			<format id="mpeg2video">
			</format>
			<format id="vc1">
				<maxbitrate>15000000</maxbitrate>
			</format>
		</video>
		<audio>
			<format id="ac3">
			</format>
			<format id="aac">
			</format>
			<format id="mp3">
			</format>
			<format id="dca" encode="1" codec="ac3" preferredtranscoded="1">
				<channels>2</channels>
				<channels>6</channels>
				<maxbitrate>640000</maxbitrate>
				<bitrate>640000</bitrate>
				<maxsamplingrate>48000</maxsamplingrate>
				<minsamplingrate>11025</minsamplingrate>
				<samplingrate>48000</samplingrate>
				<samplingrate>44100</samplingrate>
				<samplingrate>32000</samplingrate>
			</format>
		</audio>
	</avcontainer>

Second issue is relates to the transcoding of DTS. In rare cases, after DTS transcoding when i play the result appears sound clipping and i do not understand what is the reason.
Here's the ffmpeg log from transcoded file with a similar sound problem:

MezzmoFFmpegTranscodeFileLog.txt

Code:

C:\Program Files (x86)\Conceiva\Mezzmo\ffmpeg.exe -y -i "F:\Serials Incoming\Lost.S03.720p.BluRay.DTS.x264-ESiR\Lost.S03E03.720p.BluRay.DTS.x264-ESiR.mkv" -map 0:v:0 -map 0:a:0 -c:v:0 libx264 -level 41 -profile:v high -filter:v "yadif" -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 -b_strategy 1 -x264opts direct-pred=auto:b-pyramid=normal:mixed-refs=1:weightb=1:8x8dct=1:fast-pskip=1:crf=22:ref=2:bframes=3:aud=1 -partitions -parti8x8-parti4x4-partp8x8-partp4x4-partb8x8 -bidir_refine 1 -c:a:0 ac3_fixed -ac 6 -ab 640000 -ar 48000 -sn -threads 0 -async 0 -f mpegts "C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\5026-mpegts-libx264-ac3-sn.mzt"

ffmpeg version N-46003-gfa48da1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Oct 25 2012 12:37:27 with gcc 4.6.2 (GCC)
  configuration: --enable-memalign-hack --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32- --enable-static --disable-shared --enable-zlib --disable-postproc --prefix=/home/peter/ffmpeg/build/gpl --enable-libmp3lame --enable-libx264 --enable-gpl --extra-libs='-lx264 -lpthread' --enable-runtime-cpudetect --extra-cflags=-I/home/peter/cc/include --extra-ldflags=-L/home/peter/cc/lib --pkg-config=pkg-config --disable-w32threads --enable-zlib
  libavutil      52.  0.100 / 52.  0.100
  libavcodec     54. 69.100 / 54. 69.100
  libavformat    54. 34.100 / 54. 34.100
  libavdevice    54.  3.100 / 54.  3.100
  libavfilter     3. 20.105 /  3. 20.105
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 16.100 /  0. 16.100
Input #0, matroska,webm, from 'F:\Serials Incoming\Lost.S03.720p.BluRay.DTS.x264-ESiR\Lost.S03E03.720p.BluRay.DTS.x264-ESiR.mkv':
  Metadata:
    title           : Season 3, Episode 3: Further Instructions
    creation_time   : 2008-01-21 20:45:47
  Duration: 00:42:05.52, start: 0.000000, bitrate: 7408 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default)
[libx264 @ 0227f200] using SAR=1/1
[libx264 @ 0227f200] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
[libx264 @ 0227f200] profile High, level 4.1
Output #0, mpegts, to 'C:\Users\Sergey\AppData\Local\Conceiva\Mezzmo\TranscodingFiles\3DEB6B7C-1155-4a90-A3FF-21425B61D269\Video\5026-mpegts-libx264-ac3-sn.mzt':
  Metadata:
    title           : Season 3, Episode 3: Further Instructions
    encoder         : Lavf54.34.100
    Stream #0:0(eng): Video: h264, yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=-1--1, 90k tbn, 23.98 tbc (default)
    Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1, s16p, 640 kb/s (default)
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> libx264)
  Stream #0:1 -> #0:1 (dca -> ac3_fixed)
Press [q] to stop, [?] for help
frame=   64 fps=0.0 q=27.0 size=      19kB time=00:00:03.09 bitrate=  50.5kbits/s    
frame=   97 fps= 97 q=27.0 size=     142kB time=00:00:04.50 bitrate= 258.5kbits/s    
frame=  116 fps= 77 q=27.0 size=     424kB time=00:00:05.30 bitrate= 655.9kbits/s    
st:0 PTS: 499650 DTS: 499650 < 503251 invalid, clipping
[mpegts @ 020d7200] st:0 PTS: 502350 DTS: 502350 < 503252 invalid, clipping
frame=  135 fps= 67 q=27.0 size=     776kB time=00:00:06.06 bitrate=1048.5kbits/s    
frame=  153 fps= 61 q=27.0 size=    1093kB time=00:00:06.82 bitrate=1310.9kbits/s    
frame=  174 fps= 57 q=27.0 size=    1344kB time=00:00:07.67 bitrate=1435.1kbits/s    
frame=  194 fps= 55 q=27.0 size=    1581kB time=00:00:08.53 bitrate=1517.6kbits/s    
frame=  214 fps= 53 q=27.0 size=    1823kB time=00:00:09.33 bitrate=1599.7kbits/s    
frame=  233 fps= 51 q=27.0 size=    2058kB time=00:00:10.19 bitrate=1653.0kbits/s    
frame=  254 fps= 50 q=27.0 size=    2333kB time=00:00:11.06 bitrate=1727.7kbits/s    
frame=  277 fps= 50 q=27.0 size=    2638kB time=00:00:11.99 bitrate=1802.6kbits/s    
frame=  299 fps= 49 q=27.0 size=    2935kB time=00:00:12.91 bitrate=1860.8kbits/s    
frame=  321 fps= 48 q=27.0 size=    3198kB time=00:00:13.81 bitrate=1896.4kbits/s    
frame=  342 fps= 48 q=27.0 size=    3463kB time=00:00:14.74 bitrate=1924.0kbits/s    
frame=  363 fps= 47 q=27.0 size=    3743kB time=00:00:15.60 bitrate=1964.8kbits/s    
frame=  390 fps= 48 q=27.0 size=    4021kB time=00:00:16.69 bitrate=1973.1kbits/s    
frame=  413 fps= 47 q=27.0 size=    4285kB time=00:00:17.72 bitrate=1980.9kbits/s    
frame=  431 fps= 47 q=27.0 size=    4495kB time=00:00:18.42 bitrate=1998.7kbits/s    
frame=  451 fps= 46 q=24.0 size=    4706kB time=00:00:19.22 bitrate=2005.4kbits/s    
frame=  478 fps= 47 q=27.0 size=    5031kB time=00:00:20.40 bitrate=2019.6kbits/s    
frame=  499 fps= 46 q=27.0 size=    5221kB time=00:00:21.30 bitrate=2007.6kbits/s    
frame=  521 fps= 46 q=27.0 size=    5425kB time=00:00:22.16 bitrate=2004.9kbits/s    
frame=  545 fps= 46 q=27.0 size=    5642kB time=00:00:23.22 bitrate=1990.2kbits/s    
frame=  567 fps= 46 q=27.0 size=    5944kB time=00:00:24.08 bitrate=2021.6kbits/s    
frame=  589 fps= 46 q=27.0 size=    6210kB time=00:00:25.11 bitrate=2025.7kbits/s    
frame=  612 fps= 46 q=27.0 size=    6507kB time=00:00:25.94 bitrate=2054.7kbits/s    
frame=  635 fps= 46 q=27.0 size=    6711kB time=00:00:26.90 bitrate=2043.5kbits/s    
frame=  658 fps= 46 q=27.0 size=    6930kB time=00:00:27.86 bitrate=2037.6kbits/s    
frame=  677 fps= 46 q=27.0 size=    7230kB time=00:00:28.69 bitrate=2063.8kbits/s    
frame=  695 fps= 45 q=27.0 size=    7460kB time=00:00:29.39 bitrate=2078.7kbits/s    
frame=  717 fps= 45 q=27.0 size=    7722kB time=00:00:30.32 bitrate=2085.8kbits/s    
frame=  744 fps= 45 q=24.0 size=    7963kB time=00:00:31.44 bitrate=2074.3kbits/s    
frame=  765 fps= 45 q=27.0 size=    8210kB time=00:00:32.40 bitrate=2075.3kbits/s    
frame=  786 fps= 45 q=27.0 size=    8479kB time=00:00:33.23 bitrate=2089.8kbits/s    
frame=  806 fps= 45 q=27.0 size=    8856kB time=00:00:34.00 bitrate=2133.2kbits/s    
frame=  822 fps= 45 q=27.0 size=    9143kB time=00:00:34.71 bitrate=2157.8kbits/s    
frame=  841 fps= 44 q=27.0 size=    9395kB time=00:00:35.51 bitrate=2167.4kbits/s    
frame=  863 fps= 44 q=27.0 size=    9758kB time=00:00:36.43 bitrate=2193.8kbits/s    
frame=  887 fps= 44 q=27.0 size=   10111kB time=00:00:37.43 bitrate=2212.8kbits/s    
frame=  906 fps= 44 q=27.0 size=   10493kB time=00:00:38.19 bitrate=2250.2kbits/s    
frame=  925 fps= 44 q=27.0 size=   10808kB time=00:00:38.99 bitrate=2270.2kbits/s    
frame=  954 fps= 44 q=27.0 size=   11121kB time=00:00:40.21 bitrate=2265.4kbits/s    
frame=  981 fps= 44 q=27.0 size=   11415kB time=00:00:41.33 bitrate=2262.4kbits/s    
frame=  997 fps= 44 q=27.0 size=   11669kB time=00:00:42.00 bitrate=2275.7kbits/s    
frame= 1019 fps= 44 q=27.0 size=   11981kB time=00:00:42.90 bitrate=2287.6kbits/s    
frame= 1039 fps= 44 q=27.0 size=   12272kB time=00:00:43.83 bitrate=2293.6kbits/s    
frame= 1058 fps= 44 q=27.0 size=   12530kB time=00:00:44.60 bitrate=2301.4kbits/s    
frame= 1080 fps= 44 q=27.0 size=   12829kB time=00:00:45.55 bitrate=2306.8kbits/s    
frame= 1108 fps= 44 q=27.0 size=   13092kB time=00:00:46.64 bitrate=2299.1kbits/s    
frame= 1135 fps= 44 q=27.0 size=   13463kB time=00:00:47.83 bitrate=2305.6kbits/s    
frame= 1159 fps= 44 q=27.0 size=   13749kB time=00:00:48.79 bitrate=2308.4kbits/s    
frame= 1188 fps= 44 q=27.0 size=   14044kB time=00:00:50.00 bitrate=2300.6kbits/s    
frame= 1215 fps= 44 q=27.0 size=   14300kB time=00:00:51.09 bitrate=2292.7kbits/s    
frame= 1243 fps= 44 q=27.0 size=   14594kB time=00:00:52.27 bitrate=2286.9kbits/s    
frame= 1269 fps= 44 q=27.0 size=   14896kB time=00:00:53.36 bitrate=2286.5kbits/s    
frame= 1287 fps= 44 q=27.0 size=   15115kB time=00:00:54.07 bitrate=2289.9kbits/s    
frame= 1303 fps= 44 q=27.0 size=   15362kB time=00:00:54.77 bitrate=2297.4kbits/s    
frame= 1324 fps= 44 q=27.0 size=   15726kB time=00:00:55.63 bitrate=2315.3kbits/s    
frame= 1340 fps= 44 q=27.0 size=   16033kB time=00:00:56.34 bitrate=2331.1kbits/s    
frame= 1358 fps= 43 q=27.0 size=   16401kB time=00:00:57.07 bitrate=2353.9kbits/s    
frame= 1378 fps= 43 q=27.0 size=   16735kB time=00:00:57.91 bitrate=2367.2kbits/s    
st:0 PTS: 5222850 DTS: 5222850 < 5226361 invalid, clipping
[mpegts @ 020d7200] st:0 PTS: 5225550 DTS: 5225550 < 5226362 invalid, clipping
frame= 1393 fps= 43 q=24.0 size=   17053kB time=00:00:58.53 bitrate=2386.3kbits/s    
frame= 1409 fps= 43 q=27.0 size=   17354kB time=00:00:59.21 bitrate=2401.0kbits/s    
frame= 1428 fps= 43 q=27.0 size=   17679kB time=00:00:59.99 bitrate=2414.1kbits/s