[MEncoder-users] Sound problem when transcoding and joining 2 mpg-files

[Jan Ehrhardt]

Carl Eugen Hoyos in gmane.comp.video.mencoder.user (Fri, 21 Sep 2012
08:03:05 +0000 (UTC)):
>Jan Ehrhardt <phpdev <at> ehrhardt.nl> writes:
>
>> OK, then for this one. The Sony breaks files into 
>> separate parts when filesizes increase beyond 2GB. 
>> FFProbe of the first and second file of a one hour 
>> recording:
>
>Does ffmpeg succeed in transcoding the two files?

Yes. http://x32.elijst.nl/SD00005_part-by-ffmpeg.wmv

So, old mencoder (with the desired volnorm filter) and ffmpeg do it
fine, but recent MEncoders fail.

Jan

ffmpeg -t 20 -i SD00005.MPG -vf scale=448:256 -aspect 16:9
	-sws_flags bicubic -vcodec wmv2 -b:v 336k -r 25 -g 90
	-acodec wmav2 -ab 96k -ar 44100 -ac 2
	SD00005_part-by-ffmpeg.wmv

ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers
  built on Jul 31 2012 08:30:25 with gcc 4.7.1
  configuration: --prefix=/usr/local/x64 --disable-pthreads
--enable-static --enable-libmp3lame --enable-nonfree --enable-libfaac
--enable-gpl --enable-libx264 --enable-libvorbis --enable-libtheora
--enable-libvpx --enable-zlib --enable-bzlib --arch=x86_64
--cross-prefix=x86_64-w64-mingw32- --target-os=mingw32 --disable-shared
--disable-doc --extra-cflags=-m64 --extra-ldflags='-m64
-L/usr/local/x64/lib'
  libavutil      51. 54.100 / 51. 54.100
  libavcodec     54. 23.100 / 54. 23.100
  libavformat    54.  6.100 / 54.  6.100
  libavdevice    54.  0.100 / 54.  0.100
  libavfilter     2. 77.100 /  2. 77.100
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, mpeg, from 'U:/MP_ROOT/100PNV01/SD00005.MPG':
  Duration: 00:29:42.42, start: 1818.722767, bitrate: 9327 kb/s
    Stream #0:0[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 256 kb/s
    Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x576 [SAR
64:45 DAR 16:9], 9100 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
[buffer @ 000000000184e320] w:720 h:576 pixfmt:yuv420p tb:1/90000
sar:64/45 sws_param:flags=2
[buffersink @ 000000000184e3e0] No opaque field provided
[scale @ 0000000003de0b60] w:720 h:576 fmt:yuv420p sar:64/45 -> w:448
h:256 fmt:yuv420p sar:64/63 flags:0x4
[aformat @ 0000000003f9f8c0] auto-inserting filter 'auto-inserted
resampler 0' between the filter 'src' and the filter 'aformat'
[aresample @ 0000000003f9f940] chl:stereo fmt:s16 r:48000Hz ->
chl:stereo fmt:s16 r:44100Hz
Output #0, asf, to '/SD_VIDEO/SD00005_part-by-ffmpeg.wmv':
  Metadata:
    WM/EncodingSettings: Lavf54.6.100
    Stream #0:0: Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 448x256 [SAR
64:63 DAR 16:9], q=2-31, 336 kb/s, 1k tbn, 25 tbc
    Stream #0:1: Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo,
s16, 96 kb/s
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg2video -> wmv2)
  Stream #0:0 -> #0:1 (ac3 -> wmav2)
Press [q] to stop, [?] for help
[mpeg2video @ 0000000001873980] warning: first frame is no keyframe
frame=  149 fps=0.0 q=2.5 size=     376kB time=00:00:05.71 bitrate=
538.7kbits/s dup=6 drop=0    
frame=  319 fps=319 q=3.0 size=     813kB time=00:00:12.58 bitrate=
529.3kbits/s dup=6 drop=0    
frame=  488 fps=325 q=2.1 size=    1182kB time=00:00:19.36 bitrate=
500.0kbits/s dup=6 drop=0    
frame=  501 fps=324 q=2.1 Lsize=    1217kB time=00:00:19.92 bitrate=
500.2kbits/s dup=6 drop=0    

video:931kB audio:234kB global headers:0kB muxing overhead 4.422063%