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Old 07-05-2012, 04:16 PM   #91
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I almost always test commands like that before posting. On my computer, it should have worked, or I would have corrected it... I am not sure which netcat I was using though. I often compile from source, sometimes with custom changes. I had on ongoing email conversation with the author back in the day (avian@"the l0pht"). I hear that those guys "went straight"...
I never thought for a moment it didn't work on yours.

It just didn't work OOTB on mine

Word to the wise and all.

OFFTOPIC: I got the alsa up and obeying our command. happy days,

Last edited by twobob; 07-05-2012 at 04:18 PM. Reason: Added what I was thinking about.
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Old 07-05-2012, 04:23 PM   #92
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On another topic, I have not been able to test yet, but I am almost certain that I have had problems mounting to a mount point that contained files. I thought that is WHY we need bind mount, which allows replacing a folder or file...

P.S. It is hard to write documentation that works for everybody. I try to be simple and generic, but that does not always work.

Last edited by geekmaster; 07-07-2012 at 07:24 AM.
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Old 07-06-2012, 12:54 PM   #93
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P.S. It is hard to write documentation that works for everybody. I try to be simple and generic, but that does not always work.
Yes. looking around actually everyone who mentions nc is laboured with this addendum to their docs. ho hum.

On another note more ON TOPIC:

arecord -f cd -r 192000 > ./tmp.file | tail -f ./tmp.file | ./video Does nothing.

but arecord -f cd -r 192000 | ./video almost get's it Bit of a speed problem (hehehe)

(where video is the gm code compiled as video)

I guess arecord -f cd -r 192000 > ./tmp.file and then ./video < ./tmp.file from another process is one solution.
That is more robust than the inline arecord -f cd -r 192000 | ./video

I'll just have a play... thanks.

anyone got a performance improvement for me? Many thanks
I'm just playing


arecord uses about 10% of processor to do this ridiculous request

gmplay is a little more resource hungry though

Last edited by twobob; 07-06-2012 at 01:23 PM. Reason: more coffee - added partial solution.
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Old 07-06-2012, 01:04 PM   #94
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arecord -r 8000 | tee tmp.file > video
Might work, (the ./ path is the default) and that would do both, record as a file and pass-thru.
(tail might be expecting text line endings and the above is binary data)
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Old 07-06-2012, 01:49 PM   #95
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arecord -r 8000 | tee tmp.file > video
Might work, (the ./ path is the default) and that would do both, record as a file and pass-thru.
(tail might be expecting text line endings and the above is binary data)
The "video" in the call is the binary. surely that would replace it with junk from the mic

But arecord -f cd -r 192000 | tee tmp.file | ./video

works great! thanks KNC!

Blatant device abuse lol:

Code:
[root@kindle video]# arecord -D hw -f dat -fs24_le | tee tmp.file | ./gmplay-org
Recording WAVE 'stdin' : Signed 24 bit Little Endian, Rate 48000 Hz, Stereo

overrun!!! (at least 1448.915 ms long)
overrun!!! (at least 1.691 ms long)
overrun!!! (at least 2.336 ms long)
overrun!!! (at least 15.986 ms long)
overrun!!! (at least 3.154 ms long)
overrun!!! (at least 4.272 ms long)
arecord: pcm_read:1349: read error: Input/output error
27 frames in 22.1 secs = 1.2 FPS

Last edited by twobob; 07-06-2012 at 02:11 PM. Reason: added solution
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Old 07-06-2012, 02:04 PM   #96
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Quote:
Originally Posted by twobob View Post
The "video" is the call the the binary. surely that would replace it with junk from the mic

But arecord -f cd -r 192000 | tee tmp.file | ./video

works great! thanks KNC!
Good catch. Yes it would have.
Still need a long nap here.
The "Kindle Charger" has gone up in smoke several times today (in simulation anyway).
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Old 07-06-2012, 02:08 PM   #97
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Hot and steamy

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Originally Posted by knc1 View Post
Good catch. Yes it would have.
Still need a long nap here.
The "Kindle Charger" has gone up in smoke several times today (in simulation anyway).


I do admire that project. I have had several inches of rain today however.

Perhaps a hydro-electric one could catch on here!!
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Old 07-07-2012, 07:42 AM   #98
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we can play music+video together with gmplay & mplayer.
gpplay ( through usbnet)
Code:
mplayer -quiet $3&
nc $1 $2 | ./gmplay
gpplay ( local)
Code:
mplayer -quiet $3&
zcat $1 | ./gmplay
then
Code:
chmod +x mplayer
chmod +x gmplay
with usbnet edition
Code:
gpplay 192.168.0.101 5555 <music_file>.mp3
with local edition
Code:
gpplay <video_file>.gmv <music_file>.mp3
we can extract mp3 file from video use ffmpeg:
Code:
ffmpeg.exe -i <video_file_input>.mp4 -ab 128 -ar 44100 <music_file_ouput>.mp3
note:
ffmpeg version git-N-30558-ge844abc work fine for window
to run raw2gmv under window you must install cygwin then compile it with:
gcc raw2gmv.c -o raw2gmv

to save raw video to gmv use:

Code:
# ./ffmpeg.exe -i ./input_video_file.mp4 -pix_fmt gray -f rawvideo -vf pad=800:600:0:75 -s 800x450 -r 7.7 -| ./raw2gmz >output_video_file.gmv
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Old 07-07-2012, 07:53 AM   #99
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Nice solution :)

Quote:
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we can play music+video together with gmplay & mplayer.
This is excellent advice for someone looking to get this going now.

I personally am interested in having a little more control of the code functionality than 3rd party app calls as this will allow us to potentially expand on the building blocks when they are completed.

But excellent solution for the actual final goal to be realised at this time, well commented and the cross platform research was a nice touch.

I'll have to try it out. Many thanks
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Old 07-07-2012, 08:02 AM   #100
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Quote:
Originally Posted by twobob View Post
This is excellent advice for someone looking to get this going now.

I personally am interested in having a little more control of the code functionality than 3rd party app calls as this will allow us to potentially expand on the building blocks when they are completed.

But excellent solution for the actual final goal to be realised at this time, well commented and the cross platform research was a nice touch.

I'll have to try it out. Many thanks
I had success playing audio and video with two instances of ffmpeg on my Kindles: one outputs audio to STDOUT piped to aplay, and the other outputs video to STDOUT piped to gmplay. It can even play streaming 1080p x.264 video on a K5 (rescaled to 800x600 in realtime), but on a K3 there is only enough CPU power to decode lower-resolution XviD (or use an extra non-realtime step with a temp file instead of a pipe).

What I would really like is to play audio and video with a single instance of a single program. Ehhh's video player is almost there, but his video framerate is much slower than gmplay (until I get around to making a "gmplay" gst plugin for him), and his audio has too many dropouts.

I was hoping to get alsa sound working in my ffmpeg before publishing it. For now it is just an ARM build with all options turned on (except alsa). One nice thing about ffmpeg is that it can RECORD too, including recording the framebuffer. I was thinking of using it to make youtube videos of my demos, but perhaps they would be more effective filmed from a real camcorder that shows that it is really a kindle playing the video effects...

Last edited by geekmaster; 07-07-2012 at 08:05 AM.
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Old 07-07-2012, 08:19 AM   #101
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Quote:
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What I would really like is to play audio and video with a single instance of a single program
Getting there old bean, Give me an idea what kind of audio you want chunking.

I have the harness for alsa happening. Might as well just ham something together that works then tidy it up after.

I would appreciate an idea of your vision of the audio. he talks about mp3 but that's possibly an issue - more 3rd party IP - so I'm thinking get some 8k wav stream happening and see how we go from there.

how will the data be piggybacked? are we appending it to the existing dataframes in some way? or am I to parse it out of something via perhaps ffmpeg and just side-by-side the two processes (I don't like the sound of that, screams "audio drift")

Okay well good to have you back Mr G. Any ideas gratefully accepted.
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Old 07-07-2012, 09:57 AM   #102
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Quote:
Originally Posted by ppoo View Post
we can play music+video together with gmplay & mplayer.
...
gcc raw2gmv.c -o raw2gmv

to save raw video to gmv use:

Code:
# ./ffmpeg.exe -i ./input_video_file.mp4 -pix_fmt gray -f rawvideo -vf pad=800:600:0:75 -s 800x450 -r 7.7 -| ./raw2gmz >output_video_file.gmv
I forgot that I posted my video transcoder (raw2gmv.c). I must have done it before leaving on my trip.

Your ffmpeg parameters are similar to what I used (both on the x86 version and on ARM version). The K5 is fast enough to decode and and play even 1080p x.264 video in "realtime", but the K3 is happier with smaller video with simpler (DivX or XviD) compression.

I will post my ffmpeg for kindle (with all options) soon, and some examples of how to use it.

Meanwhile, I converted your 26 karma to 2600. Welcome to the "club".
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Old 07-09-2012, 05:37 PM   #103
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Hey, i just put gmplayer on my kindle, and i'm having a problem. I can run it from winscp jsut fine, but in xterm, on the kindle, i cannot find the | symbol to run the command... is there an alternate keyboard or a better terminal emulator or a way to run it ithout that key?
also, is there a way to quit gmplayer while it is playing without a pc command?
Thanks
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Old 07-09-2012, 05:45 PM   #104
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Hey, i just put gmplayer on my kindle, and i'm having a problem. I can run it from winscp jsut fine, but in xterm, on the kindle, i cannot find the | symbol to run the command... is there an alternate keyboard or a better terminal emulator or a way to run it ithout that key?
also, is there a way to quit gmplayer while it is playing without a pc command?
Thanks
You can kill gmplay with ctrl-c character from the ssh windows that launched it. From a launcher menu that runs it in the backgroud, you can kill it with "killall -9 gmplay" from ssh (or you could add that to a launcher menu).

The xterm program does not have a vertical bar (pipe) character? Really? That sucks because it is used a lot in shells and program source code... I think you can change the keyboard layout to include that character if it is missing. Or you could try a different terminal program such as JoppyTerm.

Last edited by geekmaster; 07-09-2012 at 05:48 PM.
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Old 07-09-2012, 05:48 PM   #105
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Quote:
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You can kill gmplay with ctrl-c character from the ssh windows that launched it. From a launcher menu that runs it in the backgroud, you can kill it with "killall -9 gmplay" from ssh (or you could add that to a launcher menu).

The xterm program does not have a vertical bar (pipe) character? Really? That sucks because it is used a lot in shells and program source code... I think you can change the keyboard layout to include that character if it is missing. Or you could try a different terminal program such as JoppyTerm.
but how would i run the launcher menu to kill it? is there some way to sewt a double tap home button to close it?
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