Nico Sabbi wrote:
> more something like:
>
> mencoder -of lavf -lavfopts format=mpegts -o outputfile.ts -audiofile
> input_audio.mp3 -rawvideo w=320:h=240:fps=25 -ovc frameno
> -demuxer rawvideo /dev/zero
OK, this complained of missing audio coder type, so set it to copy; it
then succeeds; the resultant ts has no video:
----
mencoder -of lavf -lavfopts format=mpegts -ovc frameno -o outputfile.ts
-audiofile inputaudio.mp3 -oac copy -rawvideo w=320:h=240:fps=25 -ovc
frameno -demuxer rawvideo /dev/zero
MEncoder dev-SVN-r27514-4.3.2 (C) 2000-2008 MPlayer Team
CPU: AMD Athlon(tm) XP 2600+ (Family: 6, Model: 8, Stepping: 1)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
Compiled with runtime CPU detection.
success: format: 0 data: 0x0 - 0x0
rawvideo file format detected.
Audio only file format detected.
[V] filefmt:65536 fourcc:0x30323449 size:320x240 fps:25.000
ftime:=0.0400
** MUXER_LAVF
*****************************************************************
REMEMBER: MEncoder's libavformat muxing is presently broken and can generate
INCORRECT files in the presence of B-frames. Moreover, due to bugs MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit.
audiocodec: framecopy (format=55 chans=2 rate=44100 bits=16 B/s=16000
sample-0)
VIDEO CODEC ID: 0
AUDIO CODEC ID: 15001, TAG: 0
Writing header...
Writing index...23946f ( 0%) 2559.70fps Trem: 0min 0mb A-V:0.040
[0:127]
Recommended video bitrate for 650MB CD: 280
Recommended video bitrate for 700MB CD: 313
Recommended video bitrate for 800MB CD: 378
Recommended video bitrate for 2 x 650MB CD: 701
Recommended video bitrate for 2 x 700MB CD: 766
Recommended video bitrate for 2 x 800MB CD: 895
Video stream: 0.800 kbit/s (99 B/s) size: 1295784 bytes 12957.840
secs 323946 frames
Audio stream: 128.000 kbit/s (15999 B/s) size: 199163820 bytes
12447.739 secs
----
mplayer:
TS file format detected.
NO VIDEO! AUDIO MPA(pid=257) NO SUBS (yet)! PROGRAM N. 1
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
mpg123: Can't rewind stream by 1162 bits!
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
AO: [pulse] 44100Hz 2ch s16le (2 bytes per sample)
Video: no video
Starting playback...
A: 9.7 (09.6) of 14158.6 ( 3:55:58.5) 0.5%
Exiting... (Quit)
----
ffmpeg:
built on Nov 20 2008 14:37:49, gcc: 4.3.2 20081105 (Red Hat 4.3.2-7)
[mp3 @ 0x9526ff0]mdb:388, lastbuf:0 skipping granule 0
[mp3 @ 0x9526ff0]mdb:388, lastbuf:0 skipping granule 0
[mp3 @ 0x9526ff0]mdb:388, lastbuf:0 skipping granule 1
[mp3 @ 0x9526ff0]mdb:388, lastbuf:0 skipping granule 1
Seems stream 1 codec frame rate differs from container frame rate: inf
(1/0) -> nan (0/0)
Input #0, mpegts, from 'outputfile.ts':
Duration: 03:27:27.52, start: 0.000000, bitrate: 145 kb/s
Program 1 Service01
Stream #0.0[0x101]: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
> eventually changing -ovc frameno with -ovc lavc -lavcopts
> vcodec=mpeg1video:br=200
I'm not sure if you meant do a second pass with the result from the
first pass, or that frameno is deprecated so you would do it this way in
the future instead ?
Final successful command I used is: (needed to expand br to vbitrate)
mencoder -of lavf -lavfopts format=mpegts -ovc frameno -o outputfile.ts
-audiofile inputaudio.mp3 -oac copy -rawvideo w=320:h=240:fps=25 -ovc
lavc -lavcopts vcodec=mpeg1video:vbitrate=200 -demuxer rawvideo /dev/zero
----
ffmpeg:
built on Nov 20 2008 14:37:49, gcc: 4.3.2 20081105 (Red Hat 4.3.2-7)
[mp3 @ 0x80c46c0]mdb:388, lastbuf:0 skipping granule 0
[mp3 @ 0x80c46c0]mdb:388, lastbuf:0 skipping granule 0
[mp3 @ 0x80c46c0]mdb:388, lastbuf:0 skipping granule 1
[mp3 @ 0x80c46c0]mdb:388, lastbuf:0 skipping granule 1
[mpegts @ 0x80b1ad0]Invalid timestamps stream=0, pts=0, dts=8589930993,
size=165
Input #0, mpegts, from 'outputfile.ts':
Duration: 00:03:36.08, start: 0.000000, bitrate: 152 kb/s
Program 1 Service01
Stream #0.0[0x100]: Video: mpeg1video, yuv420p, 320x240 [PAR 1:1
DAR 4:3], 104857 kb/s, 25.00 tb(r)
Stream #0.1[0x101]: Audio: mp3, 44100 Hz, stereo, s16, 128 kb/s
----
mplayer:
TS file format detected.
VIDEO MPEG2(pid=256) AUDIO MPA(pid=257) NO SUBS (yet)! PROGRAM N. 1
VIDEO: MPEG1 320x240 (aspect 1) 25.000 fps 0.0 kbps ( 0.0 kbyte/s)
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 320 x 240 (preferred colorspace: Mpeg PES)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
Try appending the scale filter to your filter list,
e.g. -vf spp,scale instead of -vf spp.
VDecoder init failed :(
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffmpeg1] vfm: ffmpeg (FFmpeg MPEG-1)
==========================================================================
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
mpg123: Can't rewind stream by 1162 bits!
AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
AO: [pulse] 44100Hz 2ch s16le (2 bytes per sample)
Starting playback...
VDec: vo config request - 320 x 240 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
VO: [xv] 320x240 => 320x240 Planar YV12
A: -0.1 V: 0.0 A-V: -0.146 ct: -0.015 332/332 ??% ??% ??,?% 0 0
When played, it does in fact have null = middle-green static video, and
the audio sounds like it hasn't been harmed.
As Mr Burns might utter: "Exsssellent !" ;-)
Actually, two more Q:
1. is there a way to make the video pure black, or of a single png ?
2. is vbitrate in bit or kbit (1000 bit man doesn't indicate which) ?
DaveT.
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