Fwd: [linux-dvb] Mantis driver: making cu1216.ko work for me

Manu Abraham abraham.manu at gmail.com
Thu Apr 12 18:34:38 CEST 2007

Marko Ristola wrote:
> Hi Manu and Thomas,
> I did some testing with encrypted channels,
> because I haven't played with them before.
> I did figure out some information that might help further.
> I used my card and stored an encrypted channel a while.
> I don't have an external CAM on the card.

ie using FTA mode. The stored stream is scrambled.

> Storing went fine. It seems to me, that Kaffeine stored
> the whole TS stream as I requested. This should mean
> that both audio and video streams are on the TS.
> File sizes suggest that also.
> With a channel that had both encrypted sound and video,
> I used ffmpeg to dump out stream information:
> #ffmpeg -i MAX.doc_\ Vuosituhannen\ historia.m2t -dump MAX.output.ts >&
> MAX.world.log
> Input #0, mpegts, from 'MAX.doc_ Vuosituhannen historia.m2t':
>  Duration: N/A, bitrate: N/A
>  Stream #0.0[0x130]: Video: mpeg2video, 90000.00 fps(r)
>  Stream #0.1[0x230](fin): Audio: mp3
>  Stream #0.2[0x430](fin): Subtitle: dvbsub
> picture size invalid (0x0)
> -- END OF MAX.world.log --
> So ffmpeg didn't get out any sound or video stream packets.

naturally, otherwise no meaning for scrambling by the provider

> I used ffmpeg to dump out stream information on an encrypted video
> stream with unencrypted sound:
> Input #0, mpegts, from '../Canal+ Film 3-20070412-171818.m2t':
>  Duration: 00:00:46.9, start: 30818.352633, bitrate: 2916 kb/s
>  Stream #0.0[0x206]: Video: mpeg2video, 90000.00 fps(r)
>  Stream #0.1[0x298](swe): Audio: mp2, 48000 Hz, stereo, 256 kb/s
> picture size invalid (0x0)
> -- END OF log Canal+ log file --
> So ffmpeg seems not to be able to parse input streams that has at least
> one encrypted stream.
> However I could listen the Canal+ sound without the picture with mplayer
> (and originally with Kaffeine).
> Here is the nonworking case from above (both video and audio encrypted)
> with mplayer:
> Playing MAX.doc_ Vuosituhannen historia.m2t.
> TS file format detected.
> No stream found.
> Here is the working sound with nonavailable video with mplayer:
> Playing Canal+ Film 3-20070412-171818.m2t.
> TS file format detected.
> NO VIDEO! AUDIO MPA(pid=664) NO SUBS (yet)!  PROGRAM N. 1000
> ==========================================================================
> Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
> AUDIO: 48000 Hz, 2 ch, s16le, 256.0 kbit/16.67% (ratio: 32000->192000)
> Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
> ==========================================================================
> AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample)
> Video: no video
> Starting playback...
> So I conclude that because video works but sound does not work under
> Windows,
> with Thomas, CAM does decrypt the video stream correctly, but does not
> decrypt audio
> packets correctly or not at all and thus only the video stream is
> decrypted and shown.
> The hardware parts that are related to the decryption, are CAM module
> and the paper card.
> Maybe the paper card is only partly functional? If that has one or more
> nonfunctional
> secret key, only audio might become or stay garbage. Thomas could take
> the paper card away
> and put it back. Sound might work then. Thomas could take the paper card
> into
> a shop where the service provider could verify that it works properly
> there.
> I think that the CAM is properly attached, because video decryption works.


> Do you Manu agree? I assume here that the CAM decryption is done while
> receiving
> and not while displaying and CAM doesn't need much assistance in the
> process.

Currently the CI slot (the PCMCIA slot on the mantis) is not supported
yet. It needs more work on it. Needs some more information from the chip
manufacturer as the chip is not documented at all.


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