[MPlayer-users] SVN-r32479: pcm:file=fifo does not work

[sean darcy]

On 10/31/2010 05:59 AM, Oliver Seitz wrote:
>
>>> Considering that all applications _producing_ audio hang the far
>>> more reasonable approach is to look at the other end. [...]
>
>
>> Not sure I understand. How would you set this up in this script?
>
> Try the decoder:
>
> mkfifo test_fifo
> cat test_fifo > test_file &
> mplayer -ao pcm:file=test_fifo[:nowaveheader]
>
> Try the encoder:
>
> cat test_file >test_fifo &
> neroAacEnc -if test_fifo
>
> If one of them works and the other one doesn't, don't try to fix the
> running one :-)
>
> Greets,
> Kiste

Well both worked!

cat test_fifo > test_file & mplayer -nocorrect-pts -vo null -vc null 
-ao pcm:file=test_fifo:waveheader  test.dv
[1] 18447
MPlayer SVN-r32479-4.4.4 (C) 2000-2010 MPlayer Team
..............
Playing test.dv.
Seek failed
libavformat file format detected.
[dv @ 0x244dd80] Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: video (dvvideo), -vid 0
[lavf] stream 1: audio (pcm_s16le), -aid 0
VIDEO:  [dvsd]  720x480  0bpp  29.970 fps  28771.2 kbps (3512.1 kbyte/s)
==========================================================================
Forced video codec: null
...................
==========================================================================
Opening audio decoder: [pcm] Uncompressed PCM audio decoder
AUDIO: 48000 Hz, 2 ch, s16le, 1536.0 kbit/100.00% (ratio: 192000->192000)
Selected audio codec: [pcm] afm: pcm (Uncompressed PCM)
==========================================================================
[AO PCM] File: test_fifo (WAVE)
PCM: Samplerate: 48000Hz Channels: Stereo Format s16le
[AO PCM] Info: Faster dumping is achieved with -vc null -vo null -ao 
pcm:fast
[AO PCM] Info: To write WAVE files use -ao pcm:waveheader (default).
AO: [pcm] 48000Hz 2ch s16le (2 bytes per sample)
Starting playback...
A: 291.5 V: 291.5 A-V: -0.026 ct: -0.275 8738/8738  0%  0%  1.2% 3667 0

Could not seek to start, WAV size headers not updated!

Exiting... (End of file)
[1]+  Done                    cat test_fifo > test_file

Followed by:

cat test_file >test_fifo & 
/home/video/dvd/x264/NeroAACCodec/linux/neroAacEnc -ignorelength -q 0.5 
   -if test_fifo -of audio.aac  2>nero.log
[1] 18436
[1]+  Done                    cat test_file > test_fifo

Does the "WAV size headers not updated!" have anything to do with this?

Is it possible that mplayer is feeding the stream too slowly (too 
something) to neroAacEnc?

sean