This is an effort to reverse-engineer the Raspberry Pi license key check forMPEG-2 and VC-1 hardware video encoding.
Patch
A patch for start.elf, a firmwware blob for the VideoCore IV processor used byall Raspberry Pi models, was posted toredditby /u/fuck_the_mpeg_laon 03-03-2017:
Applying it to a4.14.44 start.elf(latest as of time of writing) results in the following diff:
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Some initial analysis was done by q3kon Hacker News:
Raspberrypiには、隠された再生機能があるようで。 MPEG-2のライセンスキーを買って有効にすると、生tsの再生が激スムーズになるようだ。撮ったtsをヌルヌル再生したい。 raspbian用に早速購入。 MPEG-2 license key - Raspberry Pi Store 2.4ユーロで買った。35. Jun 25, 2016 Name: Raspberry Pi Mpeg2 Keygen The manual also lists the key combination that opens up the Preferences panel, more information that would have been easy to include in-app. The E-mail feature taps into your iPhone's own e-mail capability, so you'll be familiar with the process there. It's a great app for anyone with local live.
Yes, it seems to patch a licensing function at 0xEC95FD4 [1] to always return 1,by patching the jump at 0xEC95FE2 (that should be only taken for the always-allowed H263 codec)to always be taken, thus always allowing all codecs.
Reverse-engineering
The initial entry point is disassembled using theVideoCore IV pluginfor IDA Pro 6 by hermanhermitage.
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After loading and analyzing start.elf, we can find the is_licensed routineat address 0xEC96290 by jumping to the file offset given to us by xxdbeforehand. The relevant code sections are available insub_EC96290.asm and is_licensed.asm.
Raspberry Pi Mpeg 2 License Keygen 258.
Here, two memory locations (0xEE86680 for MPEG-2 and 0xEE869E0 for VC-1)that point to the .bss segment are checked to determine the return value ofis_licensed. There are no other obvious references to these locations instart.elf, so memory-breakpoint debugging (TBD) is probably needed.
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I also winder if this key is actually required when running a Home Run PVR as the backend.
I cannot seem to decode HD channels only SD at this point and assumed this maybe my issue
Thanks
You should see a file called config.txt.
At end of file paste in the numbers in the email. E.g.
decode_MPG2=0x12345678
decode_WVC1=0x87654321Yes, insert sdcard into windows.
You should see a file called config.txt.
At end of file paste in the numbers in the email. E.g.
decode_MPG2=0x12345678
decode_WVC1=0x87654321I only purchased the one code MPEG2. Is the other a required code too?
Do you think this is why I am having HD issues?
Thanks for the quick reply Popcornmix. You do so much!
MPEG-2 is often used by live TV, DVDs and Blu-Rays
VC-1 is often used by Blu-Rays.
You can tell the codec in use using the codec overlay ('o' key on keyboard) or by posting a debug log(wiki).
But it's certainly possible that the lack of MPEG-2 licence may be causing your live TV issues.
If you don't play Blu-Ray images then you shouldn't need the VC-1 codec.
(2016-02-20, 20:05)popcornmix Wrote: You can get two licence keys for the Pi, MPEG-2 and VC-1.
MPEG-2 is often used by live TV, DVDs and Blu-Rays
VC-1 is often used by Blu-Rays.
You can tell the codec in use using the codec overlay ('o' key on keyboard) or by posting a debug log(wiki).
But it's certainly possible that the lack of MPEG-2 licence may be causing your live TV issues.
If you don't play Blu-Ray images then you shouldn't need the VC-1 codec.
Ok thank you. I need the MPEG2 one I guess for now to run live TV. I dont use Blu-Ray thank you again
(2016-02-20, 20:11)nb2a Wrote:(2016-02-20, 20:05)popcornmix Wrote: You can get two licence keys for the Pi, MPEG-2 and VC-1.
MPEG-2 is often used by live TV, DVDs and Blu-Rays
VC-1 is often used by Blu-Rays.
You can tell the codec in use using the codec overlay ('o' key on keyboard) or by posting a debug log(wiki).
But it's certainly possible that the lack of MPEG-2 licence may be causing your live TV issues.
If you don't play Blu-Ray images then you shouldn't need the VC-1 codec.
Ok thank you. I need the MPEG2 one I guess for now to run live TV. I dont use Blu-Ray thank you again
I cannot seem to see a file that says config.txt. I am looking at the SD card on windows machine.The card seems have Raspbian folder on it.
Openelec you need to use SSH Putty
=http://wiki.openelec.tv/index.php/Config.txt
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(2016-02-21, 00:59)Rickt1962 Wrote: If your using OSMC its easy its to navigate to it own Kodi.I have OpenElec on this card.
Openelec you need to use SSH Putty
=http://wiki.openelec.tv/index.php/Config.txt
I honestly have no idea what you just said to use
This is my first venture into Linux sorry
Free Mpeg-2
(2016-02-21, 00:50)nb2a Wrote: The card seems have Raspbian folder on it.
It's hard to help when you give such confusing information - you say you've installed only OpenELEC but you can't find config.txt (which is installed by default with OpenELEC), and now you've got this 'Raspbian' folder.. have you installed NOOBS by any chance?
(2016-02-21, 04:01)Milhouse Wrote:(2016-02-21, 00:50)nb2a Wrote: The card seems have Raspbian folder on it.
It's hard to help when you give such confusing information - you say you've installed only OpenELEC but you can't find config.txt (which is installed by default with OpenELEC), and now you've got this 'Raspbian' folder.. have you installed NOOBS by any chance?
I am using OpenElec but viewing it from a windows based computer Milhouse As I have seen online at times the config.txt file may not be visible via windows. So I did find it using SSH since on the card itself is was not visible a a stand alone. Thank you for your help and patience.
(2016-02-21, 06:40)nickr Wrote: What codec is your tv compressed with?
Checking it seems to be MPEG2 if that is what you refer to Nick
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