NAME¶
tcdecode - read multimedia streams from medium, decode to raw format and print
to standard output
SYNOPSIS¶
- tcdecode
- -i name [ -x codec ] [
-t package ] [ -g WxH ] [ -s
c,f,r ] [ -C s-e ] [ -y codec ] [
-Y ] [ -Q mode ] [ -A flag ] [
-d verbosity ] [ -v ]
COPYRIGHT¶
tcdecode is Copyright (C) by Thomas Oestreich.
DESCRIPTION¶
tcdecode is part of and usually called by
transcode.
However, it can also be used independently.
tcdecode reads source (from stdin if not explicitely defined) and prints
on the standard output.
OPTIONS¶
- -i name
- Specify input source. If ommited, stdin is assumed.
tcdecode reads streams from file or from stdin.
- -g WxH
- video frame width and height [720x576]
- -C s-e
- decode and print out only this frame interval (video) or
bytes (audio) [all].
- -x codec
- source codec, if not detected of reading from stdin. This
option also specifies video and audio context of the source for decoding.
Currently, supported parameter for codec are
| mp3 |
MPEG audio |
(lame) |
| ac3 |
AC3 audio |
(liba52) |
| dv |
Digital Video DV |
(libdv) |
| mpeg2 |
MPEG video |
(libmpeg2) |
| yv12 |
Y'CbCr YUV |
|
| mov |
Quicktime |
(libquicktime) |
- -t package
- Currently only argument supported is "lavc". Use
the codec by -x from this package. Available (-x) codecs for lavc
are: mpeg2, divx3, divx, divx4, mp42, mjpg, rv10, svq1, svq3, vp3, 4xm,
wmv1, wmv2, hfyu, indeo3, h263p, h263i
- -y codec
- target codec. tcdecode only decodes to raw format
suitable for transcode. Valid option parameter for codec are
| rgb |
RGB 24bit |
| yv12 |
Y'CbCr YUV |
| yuy2 |
4:2:2 YUV |
| pcm |
SIGNED LE 16bit PCM |
- -s c,f,r
- audio gain for AC3 downmixing [1.0,1.0,1.0]
- -Y
- decoded Digital Video (raw) YUV frame is in YUY2 (packet)
format using libdv. Downsample frame to YV12. PAL users should compile
libdv with --with-pal-yuv=YV12 to avoid this option [off]
- -A flag
- audio flag for AC3/A52 decoder [none]. This flag determines
the down-mixing configuration. Valid choices for flag are
determined by the following bits set:
| drc off |
1 |
| demux |
2 |
| dolby off |
4 |
Add those numbers to turn multiple options on.
- -Q mode
- decoding quality. Certain codecs, e.g., DV with libdv allow
for changing this parameter if speed is prefered over quality. Valid
parameter are 1=fastest-5=best [5].
- -d level
- With this option you can specify a bitmask to enable
different levels of verbosity (if supported). You can combine several
levels by adding the corresponding values:
| QUIET |
0 |
| INFO |
1 |
| DEBUG |
2 |
| STATS |
4 |
| WATCH |
8 |
| FLIST |
16 |
| VIDCORE |
32 |
| SYNC |
64 |
| COUNTER |
128 |
| PRIVATE |
256 |
- -v
- Print version information and exit.
NOTES¶
tcdecode is a front end for decoding various sources and is used in
transcode(1)'s import modules.
EXAMPLES¶
The command
tcdecode -i foo.mp3 -x mp3
decodes an MPEG audio stream and prints raw PCM data to stdout.
The command
tcextract -i foo.avi -x mp3 | tcdecode -x mp3
extracts an MPEG audio track from the AVI-file foo.avi and pipes the frames into
the decoder
AUTHORS¶
tcdecode was written by Thomas Oestreich
<ostreich@theorie.physik.uni-goettingen.de> with contributions from many
others. See AUTHORS for details.
SEE ALSO¶
avifix(1),
avisync(1),
avimerge(1),
avisplit(1),
tcprobe(1),
tcscan(1),
tccat(1),
tcdemux(1),
tcextract(1),
tcdecode(1),
transcode(1)
