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by richardp
Sat Jan 05, 2013 4:36 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

I can't get it to do anything useful with the 480p Big Buck Bunny, although it does with the 720p. I get no output in the file for the 480p, for some reason, although it does appear to be doing what I'd expect it to. Again, as with my own test streams, it produces output which ffplay, mplayer and v...
by richardp
Sat Jan 05, 2013 2:49 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

I must admit, I'm heading that way, too. I've taken the nontrivial step of seeing if the Pi's build of ffmpeg is broken and built my own, cross-compiling from my desktop to save some months on the Pi. No change, other than a few minor API issues (and a lot of kerfuffle with symlinks and whatnot try...
by richardp
Fri Jan 04, 2013 4:34 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

dickon wrote:I struggled, but I think I got the gist :-)

I should be free tomorrow to look at things.
I am at a loss... short of re-writing to understand the OMX parts. What ideas do you have, perhaps I could give them a bash.

Richard
by richardp
Fri Jan 04, 2013 10:36 am
Forum: Other projects
Topic: Most minimalistic lego "case"
Replies: 1
Views: 1413

Re: Most minimalistic lego "case"

Brilliant!
by richardp
Fri Jan 04, 2013 9:43 am
Forum: Raspbian
Topic: Kernel sources avaliability
Replies: 25
Views: 11711

Re: Kernel sources avaliability

rurwin wrote:
So far as I can see, publishing that procedure more widely would answer the problem.
It would be a start :D
by richardp
Fri Jan 04, 2013 7:52 am
Forum: Raspbian
Topic: Kernel sources avaliability
Replies: 25
Views: 11711

Re: Kernel sources avaliability

CONSPICUOUS Notice, a file on an SD card does not cut the mustard. I am not bringing it up to be a pain.... I am bringing it up as a point that the modified sources are a complete DOG to find. The sources are on Github which is valid... but what TagID ? so far in the the thread no-one knows. If ther...
by richardp
Fri Jan 04, 2013 7:23 am
Forum: Raspbian
Topic: Kernel sources avaliability
Replies: 25
Views: 11711

Re: Kernel sources avaliability

So the GPL legal obligations are not being adhered to with a 'Clear Notice' of where the sources for all the packages are available with the current running configuration. I hate to see this get derailed so I am only in for a few comments, but where in regard to the Linux kernel is this "clear noti...
by richardp
Fri Jan 04, 2013 7:03 am
Forum: Troubleshooting
Topic: Slow Simultaneous USB and Ethernet
Replies: 3
Views: 1083

Re: Slow Simultaneous USB and Ethernet

Ah. I didn't think of that. It does appear that scp is CPU bound, but doing a similar Ethernet transfer with rsync (insecure, so no ssh) takes almost as much CPU as well. Is there an even more lightweight protocol to transfer files over Ethernet? Any protocol that uses UDP as the transport (NFS for...
by richardp
Fri Jan 04, 2013 6:55 am
Forum: General discussion
Topic: Plea for cheap battery PSU for Rpi Robot
Replies: 25
Views: 5655

Re: Plea for cheap battery PSU for Rpi Robot

My question is to you really need a regulator when running from a battery? Considering how many stability issues are resolved using a better quality power supply, I'd suspect that without good regulation you're just asking for trouble. But, I suppose it's worth a try. You are right... the RasPi doe...
by richardp
Fri Jan 04, 2013 6:33 am
Forum: Raspbian
Topic: Kernel sources avaliability
Replies: 25
Views: 11711

Re: Kernel sources avaliability

So the GPL legal obligations are not being adhered to with a 'Clear Notice' of where the sources for all the packages are available with the current running configuration.
by richardp
Thu Jan 03, 2013 5:44 pm
Forum: Beginners
Topic: "Beginners" put off...
Replies: 297
Views: 37675

Re: "Beginners" put off...

For bash programming... rather look

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html
by richardp
Thu Jan 03, 2013 3:35 pm
Forum: General discussion
Topic: Plea for cheap battery PSU for Rpi Robot
Replies: 25
Views: 5655

Re: Plea for cheap battery PSU for Rpi Robot

For a Power supply, why not just use a 6V battery and a silicon diode for a 0.7V drop.... effectively giving 5.3V. (add a Shottky for another 0.2V drop)

My question is to you really need a regulator when running from a battery?

Richard
by richardp
Thu Jan 03, 2013 9:34 am
Forum: Troubleshooting
Topic: Slow Simultaneous USB and Ethernet
Replies: 3
Views: 1083

Re: Slow Simultaneous USB and Ethernet

I am trying to capture imagery over USB and stream it out over Ethernet. The imagery capture works when there is no Ethernet activity, but when I try to copy the images over Ethernet using scp, both the Ethernet download and USB capture slow down significantly. I believe this is an issue with simul...
by richardp
Wed Jan 02, 2013 6:42 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

My previous post made no sense :-P .. fixed now I cant get any of the output parameters to change.... fps, H264_PROFILE, width, height, bitrate all stay the same even if I set to dumb values.. I change a ton in makeoutputcontext() but the container never changes. Never mind the pts/dts values... I c...
by richardp
Wed Jan 02, 2013 3:30 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

I cant get any of the output parameters to change.... fps, H264_PROFILE, width, height, bitrate all stay the same even if I set to dumb values.. I cnahe a ton is makeoutputcontext() but the container never changes. Never mind the pts/dts values... I cant get them to any other value other than NOPTS
by richardp
Wed Jan 02, 2013 1:03 pm
Forum: Beginners
Topic: "Beginners" put off...
Replies: 297
Views: 37675

Re: "Beginners" put off...

In addition to the previous post on this the lead author Eben is sited as co-creator as such he probably has more insite than almost anybody currently in the mix. I'd say yes it's £12.99 well spent if for no other reason than for it's place in history. £12.99 for the book on a £25 device :D Thats q...
by richardp
Wed Jan 02, 2013 11:20 am
Forum: Python
Topic: Radio link with GPIO possible?
Replies: 17
Views: 7291

Re: Radio link with GPIO possible?

Would this be useful ? .. the Pi doing 100Mhz FM transmitter using the spread-spectrum functionality on a GPIO. Although only one direction :P

http://www.adafruit.com/blog/2012/12/14 ... pberry_pi/
by richardp
Tue Jan 01, 2013 6:06 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

Oh, actually, maybe it has. I have a test stream I often use for this sort of thing -- it's a copy of Lord of Misrule from the BBC Archives -- which I know to be fairly correct. It'll now at least play after transcoding, albeit again unseekably and only if I specify -fps to mplayer. It wasn't doing...
by richardp
Tue Jan 01, 2013 5:28 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

That's interesting. You should also see a few before the main setup output, as it'll be feeding those frames to the decoder for it to guess at the frame size. -9223372036854775808 is AV_NOPTS_VALUE. There is one more bug that I've spotted and am in the process of fixing: lavf takes ownership of the...
by richardp
Tue Jan 01, 2013 4:54 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

Transcoding the original MOV I get the debug cmd: ./omxtx original.mov out.h264 Inbound PTS: 700 (1/2400) Inbound PTS: 1000 (1/2400) Inbound PTS: 900 (1/2400) Inbound PTS: 1200 (1/2400) Inbound PTS: 1100 (1/2400) Saving the output, and then re-transcoding the resultant .h264 file the output is.. ./o...
by richardp
Tue Jan 01, 2013 12:36 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

2400000.00? Novel... I've been using various files to test with, as I have a fair few around here. Which bigbuckbunny are you using? Can you give me the direct URL? http://mirrorblender.top-ix.org/peach/bigbuckbunny_movies/big_buck_bunny_480p_h264.mov http://download.blender.org/peach/bigbuckbunny_...
by richardp
Tue Jan 01, 2013 12:06 pm
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

FFMPEG shows Seems stream 0 codec frame rate differs from container frame rate: 2400000.00 (2400000/1) -> 25.00 (25/1) Seems stream 0 codec frame rate differs from container frame rate: 2400000.00 (2400000/1) -> 25.00 (25/1) Input #0, h264, from 'out.h264': Duration: N/A, bitrate: N/A Stream #0.0: V...
by richardp
Tue Jan 01, 2013 11:30 am
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

Using the Big buck bunny MOV file... omx player plays it, after transcode to a 264, this is what mplayer balks at.. :) What sample videos are being used typically ? R mplayer out.h264 MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team mplayer: could not connect to socket mplayer: No such file or directory ...
by richardp
Tue Jan 01, 2013 10:48 am
Forum: OpenMAX
Topic: omxtx - open source transcoding example
Replies: 239
Views: 126943

Re: omxtx - open source transcoding example

The problem with using the audio renderer and the clock components is that you're then tied to transcoding at a maximum of real-time. Not ideal, and not actually needed. You should have PTS values available in both your video and associated audio streams. These give you the times at which your pack...
by richardp
Tue Jan 01, 2013 10:04 am
Forum: Bare metal, Assembly language
Topic: Implementing a USB Driver
Replies: 86
Views: 19633

Re: Implementing a USB Driver

As far as I can gather, the chip set used in the RPI was originally designed for set top boxes so I understand that there could be some "sticky" issues revolving around the GPU.... Not a STB processor. It has all the hallmarks of a mobile phone CPU. PoP memory, no Ethernet Mac, camera port, USB OTG...

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