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| paddatrapper | nancy98[m]: https://docs.google.com/document/d/1PviUDsNNiqs8UaJS5T5QakIvGR8vbN6CXYPIUIS4XHQ/edit?usp=sharing | 10:09 |
|---|---|---|
| tpb | Title: paddatrapper/nancy - GSoC Weekly Meeting Notes - Google Docs (at docs.google.com) | 10:09 |
| paddatrapper | nancy98[m]: are you using wifi or wired connection? | 10:20 |
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| TheAssassin | so, I was asking myself, why encode the stream as MJPEG? Is this the most efficient codec? Most other capture solutions seem to have great success with h264 | 19:13 |
| CarlFK | TheAssassin: I think because no one has coded it. 1/2 based on looking over this list https://opencores.org/projects?cat=Video+controller | 19:21 |
| tpb | Title: Projects :: OpenCores (at opencores.org) | 19:21 |
| TheAssassin | well now I have this FPGA board | 19:21 |
| TheAssassin | which I won't use in production for now :) | 19:22 |
| TheAssassin | so I thought, why not improve performance myself | 19:22 |
| TheAssassin | seems like the code is C, not some obscure language | 19:22 |
| TheAssassin | it appears to me like the bottleneck is the encoder here | 19:22 |
| TheAssassin | hmm there's h.264 _de_coders on that page | 19:39 |
| TheAssassin | CarlFK: thinking about it, if the encoder was the issue, why does higher compression mean better framerate...? | 19:40 |
| CarlFK[m] | It throws out more data | 19:41 |
| TheAssassin | yeah sure | 19:42 |
| TheAssassin | but that seems to me like more work than just handing out t he pictures less modified | 19:42 |
| TheAssassin | so, back to the I/O theory | 19:43 |
| CarlFK[m] | And in sure the USB bus is a bottle neck | 19:43 |
| TheAssassin | _a_ bottleneck, but _the_ bottleneck? | 19:44 |
| TheAssassin | unfortunately there's nothnig like a CPU monitor... | 19:45 |
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| CarlFK | TheAssassin: im trying to grab a frame, without decoding it first.. any idea whats goingon here? | 22:03 |
| CarlFK | why does the first work but the 2nd hang: http://paste.ubuntu.com/p/nqb58qX5qw/ | 22:03 |
| tpb | Title: Ubuntu Pastebin (at paste.ubuntu.com) | 22:03 |
| TheAssassin | CarlFK: in the first command, the frames are encoded as pngs, and then saved as pngs | 22:04 |
| TheAssassin | in the second one, they're left as-is, but youre trying to save .jpg files | 22:04 |
| TheAssassin | maybe that confuses gstreamer | 22:04 |
| CarlFK | I swapped the filesink for fakesink, no help | 22:09 |
| CarlFK | added jpegdec, that fixed it | 22:10 |
| TheAssassin | CarlFK: so.... it' | 22:11 |
| TheAssassin | s certainly encoded, isn't it? | 22:11 |
| CarlFK | it's the hdmi2usb device | 22:12 |
| CarlFK | Im trying to see how many bytes in a frame | 22:12 |
| TheAssassin | oh I thought I had read you turnedoff the encoder in the firmware | 22:12 |
| TheAssassin | hmm | 22:13 |
| TheAssassin | well, I think there's more in the stream than the raw frame data | 22:13 |
| TheAssassin | you might be able to measure it if you could manage to stream it unmodified e.g., via UDP broadcast/multicast, and using wireshark to have a look at what's being generated | 22:13 |
| CarlFK | id rather get better at gst | 22:17 |
| TheAssassin | yeah... my suggestion is a little bit overengineered :) | 22:17 |
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