[mythtv-users] No audio during playback on one ATSC channel, streams miscrecognized in frontend? (KQED 9.1)

[glen martin]

Kevin Kuphal wrote:
> glen martin wrote:
>   
>> On this one ATSC subchannel (SF Bay area KQED 9.1 in San Francisco, for
>> those as may care), no audio during playback. The backend seems to find
>> 3 audio tracks during record, neither of two frontends seem to recognize
>> them and disables audio.
>>     
> When I had this happen on a channel it was because it was encrypted 
> audio and unencrypted video.
>   
Thanks for the data point, but I don't think that's the case here.

First, it is a PBS station, so I couldn't imagine them intentionally
encrypting. Second, I tried the file in mplayer, and sound worked.
mplayer had other difficulties with this file, dropping video or
something that I interpret as a problem with interlacing or video format
and I don't care at the moment to figure out the vf incantations. But
the point is, it found a sound stream, and played it, and sound came out.

I tried a different broadcast from the same channel in both mplayer and
mythfrontend, and for that one mplayer worked great, sound and video,
and again mythfrontend didn't play any audio.

So it looks to me as if the backend has done the right thing at record
time, or enough of the right thing. mythfrontend is failing to detect
the audio streams in recordings from this channel.

<mplayer log for the same program as the previous logs>
Playing 1091_20060704000000.mpg.
get_path('sub/') -> '/home/glenm/.mplayer/sub/'
[file] File size is 2238410720 bytes
STREAM: [file] 1091_20060704000000.mpg
STREAM: Description: File
STREAM: Author: Albeu
STREAM: Comment: based on the code from ??? (probably Arpi)
Checking for YUV4MPEG2
ASF_check: not ASF guid!
Checking for NuppelVideo
Checking for REAL
Checking for SMJPEG
Searching demuxer type for filename 1091_20060704000000.mpg ext: .mpg
Checking for Nullsoft Streaming Video
Checking for MOV
Checking for VIVO
header block 1 size: 99
Checking for PVA
Checking for MPEG-TS...
TRIED UP TO POSITION 188, FOUND 47, packet_size= 188, SEEMS A TS? 1
GOOD CC: 32, BAD CC: 0
TS file format detected.
DEMUX OPEN, AUDIO_ID: -1, VIDEO_ID: -1, SUBTITLE_ID: -2,
Checking for MPEG-TS...
TRIED UP TO POSITION 188, FOUND 47, packet_size= 188, SEEMS A TS? 1
GOOD CC: 32, BAD CC: 0
PROBING UP TO 2000000, PROG: 0
VIDEO MPEG2(pid=49)AUDIO A52(pid=51) NO SUBS (yet)!  PROGRAM N. 0
==> Found video stream: 0
==> Found audio stream: 0
Opened TS demuxer, audio: 2000(pid 51), video: 10000002(pid
49)...POS=564, PROBE=2000000
Searching for sequence header... OK!
VIDEO:  MPEG2  1920x1080  (aspect 3)  29.970 fps  12011.2 kbps (1501.4
kbyte/s)
[V] filefmt:29  fourcc:0x10000002  size:1920x1080  fps:29.97  ftime:=0.0334
get_path('sub/') -> '/home/glenm/.mplayer/sub/'
get_path('default.sub') -> '/home/glenm/.mplayer/default.sub'
File not found: '/home/glenm/.mplayer/default.sub'
Failed to open /home/glenm/.mplayer/default.sub
==========================================================================
Opening audio decoder: [liba52] AC3 decoding with liba52
dec_audio: Allocating 3840 bytes for input buffer.
dec_audio: Allocating 6144 + 65536 = 71680 bytes for output buffer.
Using SSE optimized IMDCT transform
AC3: 5.1 (3f+2r+lfe)  48000 Hz  384.0 kbit/s
A52 flags before a52_frame: 0x2A
A52 flags after a52_frame: 0xA
Using MMX optimized resampler
AUDIO: 48000 Hz, 2 ch, s16le, 384.0 kbit/25.00% (ratio: 48000->192000)
Selected audio codec: [a52] afm: liba52 (AC3-liba52)
==========================================================================
X11 opening display: :0.0
vo: X11 color mask:  FFFFFF  (R:FF0000 G:FF00 B:FF)
vo: X11 running at 1600x1200 with depth 24 and 32 bpp (":0.0" => local
display)
[x11] Detected wm supports NetWM.
[x11] Detected wm supports FULLSCREEN state.
[x11] Detected wm supports ABOVE state.
[x11] Detected wm supports BELOW state.
[x11] Detected wm supports STAYS_ON_TOP state.
[x11] Current fstype setting honours FULLSCREEN STAYS_ON_TOP ABOVE BELOW
X atoms
[xv common] Drawing colorkey manually.
[xv common] Using colorkey from Xv (0x0101fe).
[xv common] Maximum source image dimensions: 2046x2046
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 1920 x 1080 (preferred colorspace: Mpeg PES)
Trying filter chain: vo
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
SwScale params: -1 x -1 (-1=no scaling)
Trying filter chain: scale vo
The selected video_out device is incompatible with this codec.
Try adding the scale filter, e.g. -vf spp,scale instead of -vf spp.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b
Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
==========================================================================
Building audio filter chain for 48000Hz/2ch/s16le -> 0Hz/0ch/??...
[libaf] Adding filter dummy
[dummy] Was reinitialized: 48000Hz/2ch/s16le
[dummy] Was reinitialized: 48000Hz/2ch/s16le
ao2: 48000 Hz  2 chans  s16le
audio_setup: using '/dev/dsp' dsp device
audio_setup: using '/dev/mixer' mixer device
audio_setup: using 'pcm' mixer device
audio_setup: sample format: s16le (requested: s16le)
audio_setup: using 2 channels (requested: 2)
audio_setup: using 48000 Hz samplerate (requested: 48000)
audio_setup: frags:   8/8  (8192 bytes/frag)  free:  65536
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
AO: Description: OSS/ioctl audio output
AO: Author: A'rpi
Building audio filter chain for 48000Hz/2ch/s16le -> 48000Hz/2ch/s16le...
[dummy] Was reinitialized: 48000Hz/2ch/s16le
[dummy] Was reinitialized: 48000Hz/2ch/s16le
Starting playback...
VDec: vo config request - 1920 x 1080 (preferred colorspace: Planar YV12)
Trying filter chain: vo
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO Config (1920x1080->1920x1080,flags=0,'MPlayer',0x32315659)
VO: [xv] 1920x1080 => 1920x1080 Planar YV12
VO: Description: X11/Xv
VO: Author: Gerd Knorr <kraxel at goldbach.in-berlin.de> and others
Xvideo image format: 0x32595559 (YUY2) packed
Xvideo image format: 0x32315659 (YV12) planar
Xvideo image format: 0x59565955 (UYVY) packed
Xvideo image format: 0x30323449 (I420) planar
using Xvideo port 240 for hw scaling
aspect: Warning: no suitable new res found!
[xv] dx: 0 dy: 0 dw: 1920 dh: 1080
*** [vo] Allocating mp_image_t, 1920x1088x12bpp YUV planar, 3133440 bytes
[xv] dx: 0 dy: 0 dw: 1592 dh: 896
*** [vo] Allocating mp_image_t, 1920x1088x12bpp YUV planar, 3133440 bytes
*** [vo] Allocating mp_image_t, 1920x1088x12bpp YUV planar, 3133440 bytes
A:74507.8 V:74506.8 A-V:  0.959 ct: -0.037  12/ 12 ??% ??% ??,?% 11 0

MPlayer interrupted by signal 15 in module: decode_video

</mplayer>