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Channel 4 site changes - download fails #379

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
What steps will reproduce the problem?
1. get_flash_videos http://....../4od#nnnnnn
2.
3.

What is the expected output? What do you see instead?
rtmpdump starting download...

What version of the product are you using? On what operating system?
Latest, OpenBSD current amd64

Please provide any additional information below.
The swf file has changed from 11.21.2 to 11.23.4, some programmes still work, 
depending on the streamURL returned by ais.channel4.com in the xml. Rather than 
a url ending with rtmpe://......mp4, it returns with http://.....fm4, a http 
query returns xml data, this now appear to allow additional media bit rate 
selection.

Original issue reported on code.google.com by njtaylor...@gmail.com on 13 Apr 2012 at 9:19

GoogleCodeExporter commented 9 years ago 
This is very interesting--hopefully Channel 4 will soon be offering programmes 
at decent resolution.

All the videos I've tried so far have worked. Please provide a URL which 
doesn't work so I can have a look.

Original comment by zakflash...@gmail.com on 15 Apr 2012 at 3:14

GoogleCodeExporter commented 9 years ago 
Try this one...

http://www.channel4.com/programmes/homeland/4od#3311268

They switched to a video/f4f stream...

http://stream-recorder.com/forum/tags/f4f/

My test program... 

$ perl ch4_f4vdownload.pl 
http://www.channel4.com/programmes/homeland/4od#3311268
Fetched from http://www.channel4.com/programmes/homeland/4od#3311268
Fetched from http://ais.channel4.com/asset/3311268
Fetched from 
http://ak.abrstream.channel4.com/CH4_08_02_24_52804008001002_003_16x9_1500000_.f
4m
Bitrate   400 CH4_08_02_24_52804008001002_003_16x9_0500000_
Bitrate   700 CH4_08_02_24_52804008001002_003_16x9_0800000_
Bitrate   872 CH4_08_02_24_52804008001002_003_16x9_1000000_
Bitrate  1072 CH4_08_02_24_52804008001002_003_16x9_1200000_
Bitrate  1372 CH4_08_02_24_52804008001002_003_16x9_1500000_
Selected Bitrate = 400
Fetched Fragment 
http://ak.abrstream.channel4.com/CH4_08_02_24_52804008001002_003_16x9_0500000_Se
g1-Frag1
Fetched Fragment 
http://ak.abrstream.channel4.com/CH4_08_02_24_52804008001002_003_16x9_0500000_Se
g1-Frag2

Original comment by njtaylor...@gmail.com on 16 Apr 2012 at 12:49

GoogleCodeExporter commented 9 years ago 
Interesting, I wasn't aware of f4f. I've done a little bit of research and 
looked at the f4m file you linked to. I'm a bit concerned about the amount of 
DRM-related junk in it. Are the videos themselves encrypted to the max, or is 
it just the metadata that's encrypted? Interestingly mplayer seems to detect 
the first fragment as MPEG 4 / H264.

From what I've seen, neither ffmpeg nor mplayer support assembling these 
fragments into a single file. I had a look and found various Adobe 
specifications and ActionScript code (links below) but didn't have the time to 
investigate fully. (i.e. I don't know if the fragments contain a little bit of 
metadata and then the video data, making it relatively easy to reassemble, or 
what's going on.) 

http://download.macromedia.com/f4v/video_file_format_spec_v10_1.pdf
http://opensource.adobe.com/svn/opensource/osmf/trunk/framework/OSMF/org/osmf/ne
t/httpstreaming/
http://help.adobe.com/en_US/HTTPStreaming/1.0/Using/WS9463dbe8dbe45c4c-c126f3b12
60533756d-7ffc.html

Could you share your test script please?

Original comment by zakflash...@gmail.com on 16 Apr 2012 at 6:25

GoogleCodeExporter commented 9 years ago 
From what I found, they may not be using the DRM, or if they are it's
only a small part before the segment fragments. I couldn't see drm in
the Fragments I looked at, might be in later ones.

Part of the video is in metadata, for each bitrate, and refers to audio
video mp4a/avc1.

Attaching the test script, excuse muddle I am middle of attempting to
assemble the fragments. Might have taken wrong turn trying to create flv
file. Wasn't sure if I need to just put fragments together, or needed to
put the mdat boxes together. Internals of video files is new to me.

The DRM block in the fm4 file, have b64 decoded once, but contains
within it a B64 block, that tells you how to fetch the key. Haven't
looked at that yet.

Seen the documents above, also found my way to this one
ISO_14496-15_AVCFF.pdf.

Original comment by njtaylor...@gmail.com on 16 Apr 2012 at 7:03

GoogleCodeExporter commented 9 years ago 
Attachment striped when sent by e-mail..

Original comment by njtaylor...@gmail.com on 16 Apr 2012 at 7:26

Attachments:

GoogleCodeExporter commented 9 years ago 
Interesting, I've had a look at your test script and it seems you've done lots 
more investigation than I have.

How are you meant to determine the number of segments and fragments? It doesn't 
seem to be mentioned in the XML, and when I dumped the Flash player's memory, I 
only see Seg1-Frag1 and Seg1-Frag2--no obvious details of the total number of 
segments.

The only interesting thing I've discovered, which probably isn't that 
surprising when you think about it, is that the memory dump contains 
org.osmf.net.httpstreaming.f4f::HTTPStreamingF4FStreamInfo, implying that they 
are indeed using the ActionScript classes we expected. That could give clues 
for how to implement this maybe.

Original comment by zakflash...@gmail.com on 17 Apr 2012 at 8:53

GoogleCodeExporter commented 9 years ago 
this is what I just completed the from decoding the bootstrap b64
encoded - in the .f4m file... I get the following information

BOX abst 139
Timescale 1000
CurrentMediaTime 2846080
29 29
drm
Seg Type asrt len 25
  Segment Run Count 1
    First Segment 1 Frag per Seg 712
  reached - 25 25
Frag Type afrt len 70
  TimeScale 1000
  Frag Run Count 3
    first frag 1  Frag timestamp 0 Frag duration 4000
    first frag 712  Frag timestamp 2844000 Frag duration 2100
    frag - end of presentation
  reached - 70 70
Reached 139
139 Eof of Boxes Fragment Reached

712 is the correct number of fragments, 4000*711+2100 = 2846100
2846100 about 48mins + advert makes it 1hr about right duration.
Each fragment about 4seconds.

The abst box contains one or more asrt boxes followed by one or more
afrt boxes, those boxes contain a list of segments and fragments.
Each fragment also contains a abst box with asrt and afrt boxes within.

I revised the script, for now using download copies in files, to save
repeated downloading.

Original comment by njtaylor...@gmail.com on 17 Apr 2012 at 10:47

GoogleCodeExporter commented 9 years ago 
second test script, uses files instead of downloading each time.

Original comment by njtaylor...@gmail.com on 18 Apr 2012 at 1:43

Attachments:

GoogleCodeExporter commented 9 years ago 
I'm guessing this doesn't download a completed joined file from the fragments? 
I ran the test script with a recent ch4 program and had message "could not open"

Original comment by mathew.h...@gmail.com on 19 Apr 2012 at 8:46

GoogleCodeExporter commented 9 years ago 
The file reads are done by readfile subroutine, 
my $raw_xml =  readfile "asset";
$raw_xml = readfile "CH4_08_02_24_52804008001002_003_16x9_1500000_.f4m";
    $streamdata = readfile "CH4_08_02_24_52804008001002_003_16x9_1500000_Seg1-Frag$i";

Uses files called asset = xml contents from
http://ais.channel4.com/asset/3311268

file called CH4_08_02_24_52804008001002_003_16x9_1500000_.f4m
http://ak.abrstream.channel4.com/CH4_08_02_24_52804008001002_003_16x9_1500000_.f
4m

Script to download Fragments, uses OpenBSD ftp, may need to change to 
curl/wget...
i=1
while ([[ $i -lt 713 ]] )
do
  ftp http://ak.abrstream.channel4.com/CH4_08_02_24_52804008001002_003_16x9_1500000_Seg1-Frag${i}
  i=$(($i+1))
done

AMF0 decode of meta data gives this...
Metadata
$VAR1 = 'onMetaData';
$VAR2 = {
          'custdef' => [],
          'audiosamplerate' => '24000',
          'videocodecid' => 'avc1',
          'width' => '1024',
          'audiocodecid' => 'mp4a',
          'aacaot' => '0',
          'audiochannels' => '2',
          'videoframerate' => '25',
          'trackinfo' => [
                           {
                             'length' => '71150000',
                             'language' => 'eng',
                             'timescale' => '25000'
                           },
                           {
                             'length' => '68306944',
                             'language' => 'eng',
                             'timescale' => '24000'
                           }
                         ],
          'duration' => '2846.12266666667',
          'height' => '576',
          'avclevel' => '40',
          'avcprofile' => '77'
        };

That's for highest bit rate...

Original comment by njtaylor...@gmail.com on 19 Apr 2012 at 11:46

GoogleCodeExporter commented 9 years ago 
I guess the question is can this be made into a plugin?

Original comment by mathew.h...@gmail.com on 19 Apr 2012 at 6:35

GoogleCodeExporter commented 9 years ago 
The channel 4 plugin, would get the streamURL from the asset xml, as it
currently does if starts rtmp use rtmpdump as before. if starts http,
then calls a new utility routine FlashVideos::F4V .....
Then it could be used by other site plug-ins, for this type of streaming.

Original comment by njtaylor...@gmail.com on 19 Apr 2012 at 7:50

GoogleCodeExporter commented 9 years ago 
Perhaps I'm missing something but when I tried to play the resulting media file 
(though only containing 3 fragments), VLC didn't recognise it as a media file...

As for integration into get_flash_videos, I recommend another downloader class 
like FlashVideo::Downloader and FlashVideo::RTMPDownloader: 
FlashVideo::F4VStreamDownloader or similar. If a plugin or site module returned 
a F4V URL, get_flash_videos would just invoke the appropriate method on an 
instance of the F4VStreamDownloader class.

As 4oD finally offers (it seems) different quality settings for videos, support 
for that should be added to Channel4.pm too. See lib/FlashVideo/Site/Youtube.pm 
for an example.

Original comment by zakflash...@gmail.com on 19 Apr 2012 at 9:30

GoogleCodeExporter commented 9 years ago 
The f4v stream is based on mpeg4 - however the header parts are in the
stream url xml/.f4m file, and are in a different form to mp4. The first
step was decoding that, then the next stage is to create the mp4 header
for the file.

This is getting to far ahead from where I am at the moment.

I have done this before for ITV and Channel5 plugins. Again getting a
basic download working first, then I can look at this.

Original comment by njtaylor...@gmail.com on 20 Apr 2012 at 12:16

GoogleCodeExporter commented 9 years ago 
I'm scratching my head with this one. I'll watch this space for a plugin update.

Original comment by mathew.h...@gmail.com on 21 Apr 2012 at 12:35

GoogleCodeExporter commented 9 years ago 
Any news on progress on getting a completed download working?

Original comment by mathew.h...@gmail.com on 27 Apr 2012 at 11:47

GoogleCodeExporter commented 9 years ago 
On 04/27/12 12:47, get-flash-videos@googlecode.com wrote:

Had to take a break, should be able to get back to looking at this soon.

Original comment by njtaylor...@gmail.com on 1 May 2012 at 4:02

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
Tried cat-ting fragments together but no go with mplayer or vlc; also tried php 
script from stream recorder site which gave me a video file 13b long! I suspect 
the 4od videos may be protected by Adobe Flash Access Protection.

Original comment by jtaylor...@gmail.com on 14 May 2012 at 7:43

GoogleCodeExporter commented 9 years ago 
jtaylor: if read njtaylor's previous comments on this issue, you'll see that 
he's provided a script to combine the fragments together. It's not as simple as 
just cat-ing them, because that won't give you the FLV header. If you look at 
ch4combine.pl (line 323) you'll see there's code to generate the FLV header, 
though it's commented out. It's not commented out in ch4test.pl, njtaylor's 
other script.

njtaylor's previous investigation suggests that the video data itself isn't 
DRM'd--but it's just not obvious to figure out how to put the files together. 
The FLV file format spec and the documentation for HTTP streaming aren't 
exactly easy going.

I'd really like to get this working though, as use of it is going to increase. 
BBC trialled it last year for a Grand Prix too, worked pretty well.

Original comment by zakflash...@gmail.com on 15 May 2012 at 8:05

GoogleCodeExporter commented 9 years ago 
The script I referred to (AdobeHDS.php) is here:
https://github.com/K-S-V/Scripts

(from http://stream-recorder.com/forum/adobe-hds-fragment-joiner-t12074.html)

PHP script that assembles an flv file from the f4f fragments. Can someone else 
try it on 4od fragments?

Original comment by jtaylor...@gmail.com on 16 May 2012 at 7:56

GoogleCodeExporter commented 9 years ago 
I tried it but also just got a 13 byte file - it just contains the FLV header. 
I used http://www.channel4.com/programmes/the-cleveland-show/4od#3345377 as my 
test. njtaylor's script only downloads 2 segments (intentionally).

I've had a bit of a look at AdobeHDS.php. It can only handle packet types of 
audio (0x08) or video (0x09) yet the packet types in the F4F files I have from 
4od are 40 and 41. Nevertheless it's probably a good starting point.

Original comment by zakflash...@gmail.com on 16 May 2012 at 8:01

GoogleCodeExporter commented 9 years ago 
The AdobeDS.php script does not work, 

I added these two lines after line 293..
          $packetFlags = $packetType & 0xe0;
          $packetType = $packetType & 0x01f;

That gives some output, not output that can be played. Rather than 0x08 
or 0x09 for audio / video the type is 0x28 and 0x29, the flag bits 
indicate some form of encryption.

The .f4m xml contains Additional data contains a bundle of x509 certificates 
in some format. Along with the infromation AES-CBC and Key Length 16 (128 
bits), and 
the Metadata, combining the frag misses the header information.

Below is the output from my current script of some packets, with 
encrypted/decrypted 
audio/video using the wrong key and padding hasn't been removed after 
decryption yet either. 
1st 4 Columns are from the trun box, Hint Track, 
filt = Number of  filters to be applied
Name = Filter name, 'SE' = Selective Encryption,
FiltLen = Length of filter params
EFlag = 80 if Encrypted.
IV = AES Initial Value Vector.
PLen = Packet data length
TSize = Tag Size (Size - 4, Leng + 11)

Durat  Size   Flags     COffs Type Leng  Timesta StrID Aud/VidHdr filt Name 
Filtlen EFlag IV                                PLen TSize
    0,    57, 02000000,     0 28      42       0     0 af00          1 SE        17    80 a2d058b12ccf1dbb80e628e7e5259cf0    16    53
8b198d489ecee8c70ce405db8435e0fa
f579849c92167dec92173a9a2b60f670
    0,   124, 02000000,     0 29     109       0     0 1700000000    1 SE        17    80 3ee9d9b96150cbb8da29ec4f1d916c4d    80   120
0590f7259960135822837b7be9473c664522adde040d19fffc3b6c10f348ed98f84726d1a00cb938
7c3301c168431263
0747269bbf12b197cc54ae44d2a38dccf759241069ac502acd80eb73ecb53e221426240eb3f4add2
984646d59e3dba1e
    0,   124, 02000000,     0 29     109       0     0 1700000000    1 SE        17    80 03e9b73d360f687b0d225272bfbae920    80   120
7ac605873791e2fd84ec208e04484139ae002139e22210ffcf84478d5f0025b1cdbea837788c1faa
8583b9b11106c327
e39d6c246a0eda4ab431490b500f82af673d9de2d89ff73aa046fc3ea822ad44a61a49350b460015
1e88bdbf050bcaa4
    0,  1052, 02000000,     0 29    1037       0     0 1701000028    1 SE        17    80 1f8739e36948d56496d3e3ec11fe3b72  1008  1048
8882bf6d197979790a54c060b884ef3396149fa3f61dee6d4986244d4142040a80f561e21b155be8
fa5531929192f164
65303868989d21b6ea7d265b300c29b61193ae996b56369288141bcfc85b9e5f585953a0833cfbc3
094caec37702424d
   40,   329, 01010000,     0 28     314       0     0 af01          1 SE        17    80 32eadcaabe27fa8c24b2234624fdd870   288   325
d0f6b28e6286f10a5819f396c182e43e5864fb32d51df8297542f34fd6cdc6d11b68825e5efe06ad
fffbdd145671d4ed
73bc8c58aa3adef0b5865b1afeaa948cd06bef3657cca2d213ce5c92690b7f172efc5d701ee61cd3
66249c3b8b1296aa
    2,  2572, 01010000,     0 29    2557      40     0 2701000050    1 SE        17    80 ae186b61c5b1c49ec84c0dfacdd37aa3  2528  2568
6557069fbbb724631c1392ea90801d2deb8ea1c06307b3818b6e4e9a00792114ca60e5284035f2a6
39a65961b600b59c
f02ae1023bb1b8420ff46092d5d0315b888d69c0e9670ed9df35a7805acc211ef6f6c8f377164da7
074b0d1f0b75c887
   38,   393, 01010000,     0 28     378      42     0 af01          1 SE        17    80 1e5eff1d9fc9e56bf94ad482aa2aaaed   352   389
af293fb6d06a5ea7fac8c4123f7affdb9f5af19f50dc3c9df07b20b0d0d3f21b5f7eff8034b3c34b
c554c6540c305fe3
1600970b80b69e94089dd444698afda83ee3c522b682d5ecb6d6456b940e60980c06a3831dd5bc7e
577a89537151455c
    5,   300, 01010000,     0 29     285      80     0 2701000000    1 SE        17    80 83ba7dabe9b55061d32dd07b1420c6b3   256   296
fc34fa26fb6914f63e93a8b2456fada33fdcf6c1f9df802722b3f306b0c834fd39ba10583d0afec4
fca31e78319cb7f8
e05aba102124556bdd0f1633c3d9cb622da7fdfc0954a86ca55713fd1d6b3c682aaa76eee0f8d253
2976a330c77195a6
.....

I need to find the 16 byte(128bit) key.

Original comment by njtaylor...@gmail.com on 17 May 2012 at 3:22

GoogleCodeExporter commented 9 years ago 
Looks like the key is

    n9cLieYkqwzNCqvi

Original comment by moss...@gmail.com on 23 Jun 2012 at 9:55

GoogleCodeExporter commented 9 years ago 
are we getting close too having a means to download 4od yet?

Original comment by mark.cro...@gmail.com on 10 Jul 2012 at 7:05

GoogleCodeExporter commented 9 years ago 
The existing support works with many videos--only some use HDS. I would like to 
see HDS support too but I don't have the time to work on it, and evidently 
njtaylor doesn't either.

Perhaps someone can use njtaylor's investigation and the key and try to produce 
a working download script. If someone does this I will consider integrating it 
into gfv.

Original comment by zakflash...@gmail.com on 10 Jul 2012 at 8:06

GoogleCodeExporter commented 9 years ago 
See http://code.google.com/p/get-flash-videos/issues/detail?id=428 for some 
insights.  Who knows?  Might help.

Cheers,

-- 
Cristian

Original comment by Cristian...@gmail.com on 17 Oct 2012 at 4:44

GoogleCodeExporter commented 9 years ago 
njtaylor: can you please post the most up-to-date script that you have? I 
wonder if with the possible key provided by mossytc, your script and K-S-V's 
scripts (https://github.com/K-S-V/Scripts) we could try to hack something 
together.

Channel 4 is increasing using HDS and there are lots of shows I now can't watch 
:(

Original comment by zakflash...@gmail.com on 30 Oct 2012 at 8:20

GoogleCodeExporter commented 9 years ago 
current script.

run using perl ch4_f4v_flv.pl url
url should end in 6 digits like these
http://www.channel4.com/programmes/suburgatory/4od#3417498
http://www.channel4.com/programmes/suburgatory/4od?intcmp=homecatchup~3431801

limited to 4 fragments.. url will be set if not given.
create a directory with the 6 digits, downloads once into directory, then on 
uses directory. lots of print / output can be taken out. Needs Convert::ASN1.

Original comment by njtaylor...@gmail.com on 31 Oct 2012 at 9:04

Attachments:

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
The code was posted by request in a non working state, the key to decrypt the 
stream is not known so the video can't be played. This is to allow others to 
look at finding the key. Until the key is found it is unknown if the flv file 
created is in the correct format.

Original comment by njtaylor...@gmail.com on 7 Nov 2012 at 1:18

GoogleCodeExporter commented 9 years ago 
slist is still there but is not detected by the script, however i got round 
that by manually adding the details. the key seems to be in the swf file, 
contractid from the xml is another potential for the key 
http://ais.channel4.com/asset/3412042?1346634890, the token would be my best 
guess where the key is as it seems to be long similar to a 128bit key. im going 
to do some packet capturing just as it about to begin and end the key will be 
hidden or obvious but finding it is the hard bit.

Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 6:45

GoogleCodeExporter commented 9 years ago 
mmmmm seems i might have stumble upon the key without realizing it

see attach file ive not a clue how i got it

Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 6:54

Attachments:

GoogleCodeExporter commented 9 years ago 
and it seems i have got hold of another xml file not sure where from but it has 
some interesting data

<drmAdditionalHeader
         drmContentId="293409"
         id="drmMetadata5154"
    >
        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    </drmAdditionalHeader>

Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 6:58

Attachments:

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
ok i have been doing some packet capturing here is the wireshark file with the 
relevant information relating to 4od packet 1330 has some interesting 
information in the http data section, then packet 1405 acknowledges the packet 
1330 and it the server then keeps on repeating this. this could be the key to 
time team episode above Data: 
7b2265787069726564223a66616c73652c22617373657449...

Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 9:21

Attachments:

GoogleCodeExporter commented 9 years ago 
david i just took a look at your link and here is something more interesting

<bootstrapInfo profile="named" id="bootstrap1242">
AAAAi2Fic3QAAAAAAAAAAgAAAAPoAAAAAAAVwoAAAAAAAAAAAAAAAAAAAQAAABlhc3J0AAAAAAAAAAAB
AAAAAQAAAWUBAAAARmFmcnQAAAAAAAAD6AAAAAADAAAAAQAAAAAAAAAAAAAPoAAAAWUAAAAAABW6gAAA
B9AAAAAAAAAAAAAAAAAAAAAAAA==
</bootstrapInfo>
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AAkAAAkAAAkAAAk=
</drmAdditionalHeader>
<media streamId="CH4_08_02_24_52710219001001_001_16x9_0500000_" 
url="CH4_08_02_24_52710219001001_001_16x9_0500000_" bitrate="400" 
bootstrapInfoId="bootstrap1242" drmAdditionalHeaderId="drmMetadata8468">
<metadata>
AgAKb25NZXRhRGF0YQgAAAAAAAhkdXJhdGlvbgBAlkhc17kArwAFd2lkdGgAQIAAAAAAAAAABmhlaWdo
dABAcgAAAAAAAAAMdmlkZW9jb2RlY2lkAgAEYXZjMQAMYXVkaW9jb2RlY2lkAgAEbXA0YQAKYXZjcHJv
ZmlsZQBAU0AAAAAAAAAIYXZjbGV2ZWwAQD4AAAAAAAAABmFhY2FvdAAAAAAAAAAAAAAOdmlkZW9mcmFt
ZXJhdGUAQDkAAAAAAAAAD2F1ZGlvc2FtcGxlcmF0ZQBA13AAAAAAAAANYXVkaW9jaGFubmVscwBAAAAA
AAAAAAAJdHJhY2tpbmZvCgAAAAIDAAZsZW5ndGgAQYD/zoAAAAAACXRpbWVzY2FsZQBA2GoAAAAAAAAI
bGFuZ3VhZ2UCAANlbmcAAAkDAAZsZW5ndGgAQYBSAAAAAAAACXRpbWVzY2FsZQBA13AAAAAAAAAIbGFu
Z3VhZ2UCAANlbmcAAAkAB2N1c3RkZWYKAAAAAAAACQ==
</metadata>
</media>

note how the media file calls the bootstrap and drmheaderinfo and has it own 
metadata that is where the key is

Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 9:26

GoogleCodeExporter commented 9 years ago 
and here is base64 decode of the drm string david posted

�|AdditionalHeader�
Encryption�Version�@��������Method�Standard�Flags�
�����������Params�Version�?��������Enc
ryptionAlgorithm�AES-CBC�EncryptionParams�    KeyLength�@0�����
����� �KeyInfo�subType�
FlashAccessv2�FMRMS_METADATA�Metadata 
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Original comment by andrewcr...@gmail.com on 7 Nov 2012 at 9:28

GoogleCodeExporter commented 9 years ago 
Updated script, this should now work for url's like

http://www.channel4.com/programmes/channel-4-news/4od

returns most recent or

http://www.channel4.com/programmes/time-team-specials/4od#3412042?1346634890
where http://ais.channel4.com/asset/3412042?1346634890 was used when
http://ais.channel4.com/asset/3412042 should be used, otherwise part of the xml 
returned is missing - comment 32.

Comment 33 - ch4_f4v_flv.pl outputs the der file.
Comment 35 - already handles that...
Comment 37, 38 - already handled the drm string large chunk of data is in 
AMF0/Base 64/ASN1 format - the ANS1 format is in the .der file.

Original comment by njtaylor...@gmail.com on 8 Nov 2012 at 12:08

Attachments:

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
This is not a typical certificate - doesn't start with -----BEGIN 
CERTIFICATE----- at least. However even if you add -----BEGIN CERTIFICATE----- 
and -----END CERTIFICATE-----, it will still not decode.

Original comment by aulisme...@gmail.com on 8 Nov 2012 at 1:31

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
When I looked at the traffic, there was some traffic with redbeemedia, which 
appears in the .der, which is the point I reached. I was going to look at the 
message / response, to see if the key was in the response. redbeemedia has 
channel 4 as a client, could just be advert related. Flash Access from what I 
have seen is meant to send a request and get the key in a response, this is why 
I stuck the ASN1 decoding in.

The .der is too large for a single certificate, I split it up had 3 files

This is what I used to look at the .der file - the asn1parse told me it's pkcs7

openssl pkcs7 -inform DER -in ch4_xxx.der -print_certs -text

openssl asn1parse -inform DER -in ch4_xxx.der

Original comment by njtaylor...@gmail.com on 8 Nov 2012 at 2:51

GoogleCodeExporter commented 9 years ago 
If you do ... (need openssl asn1parse to find offset/size of large bit stream..)

dd if=ch4_xxx.der of=xx.der bs=1 skip=62 count=2042

openssl asn1parse inform der -in xx.der

to view the ASN1 string contained within

Original comment by njtaylor...@gmail.com on 8 Nov 2012 at 3:17

GoogleCodeExporter commented 9 years ago 
Red Bee Media are actually the technological designers of all this new security 
system process for 4oD.

Original comment by aulisme...@gmail.com on 8 Nov 2012 at 4:05

GoogleCodeExporter commented 9 years ago 
Red Bee Media servers are being called 4 times in the example I use ( 
http://www.channel4.com/programmes/the-album-chart-show/4od#3420568 ).
This URL called twice: 
http://fax.c4.aws.redbeemedia.com//flashaccess/getServerVersion/v3 but gets 404.
This URL also twice: http://fax.c4.aws.redbeemedia.com//flashaccess/license/v1
If you open this up in your browser, you will see "License Server is setup 
correctly.". This is apparently an access point where it is supposed to get the 
key from.

All these requests are POST requests. What is being sent to the server is 
something I cannot understand just yet, probably some other kind of a key, it 
has "Adobe Systems Incorporated110/U(Adobe Flash Access Customer 
Bootstrap" in it, the rest is encoded somehow. What's more interesting, http 
response is empty, so the key value is not there. Or at least I can't see it.

Red Bee Media uses Nevion’s Flashlink solutions for Channel 4's content 
transport
http://tinyurl.com/ayff3fz

Original comment by aulisme...@gmail.com on 8 Nov 2012 at 4:47

GoogleCodeExporter commented 9 years ago 
the script still doesnt detect slist at least for this one

C:\Users\Andy\Downloads>perl ch4_f4v_flv.pl http://www.channel4.com/programmes/t
ime-team-specials/4od#3412042
URL http://www.channel4.com/programmes/time-team-specials/4od#3412042
Using ch4_3412042 as storage directory
Page url http://www.channel4.com/programmes/time-team-specials/4od#3412042
Used ch4_3412042/3412042.html from cache for http://www.channel4.com/programmes/
time-team-specials/4od#3412042
swf player 4odplayer-11.31.1.swf
Used ch4_3412042/asset.xml from cache for http://ais.channel4.com/asset/3412042
Stream URL http://ll.abrstream.channel4.com/CH4_08_02_24_45569001001003_003_16x9
_1500000_.f4m
Use of uninitialized value $slist in concatenation (.) or string at ch4_f4v_flv.
pl line 601.
Slist
Token jZGfXUrmGGW2uXKUQFIjgBlHc4hA0t9QZqvEDPwjNrmIlM0FPSpWT7wnAfVFcAY0RvmZxRZjuc
aUBnzVX0Wp0cxI46F4pAPj5U5Ul0rDosBz9IA8v8kdgzId8SPzY+j7jZdr5vgvT7RNRte4B37ESpxw4T
TuicmLHxdpXbYvLgVX7xtT8qsbbrVlAO+ReuSv
Use of uninitialized value $slist in concatenation (.) or string at ch4_f4v_flv.
pl line 605.
Unable to open ch4_3412042/

i can by pass it that not a problem

Original comment by andrewcr...@gmail.com on 8 Nov 2012 at 8:15

GoogleCodeExporter commented 9 years ago 
substr outside of string at ch4_f4v_flv.pl line 849.
set_iv: initial value must be the blocksize (16 bytes), but was 451013 bytes at
ch4_f4v_flv.pl line 850.

once i bypass it with teh data direct that wha ti get.

also i noticed something strange, when you use ais with assest code direct you 
get slist but when you use it wil other strings it doesnt have a slist tag but 
a e tag

Original comment by andrewcr...@gmail.com on 8 Nov 2012 at 8:19

GoogleCodeExporter commented 9 years ago 
<slist>CH4_08_02_24_45569001001003_003_16x9_1500000_.f4m</slist>
<cdn>ak</cdn>
after adding the ?
<cdn>ll</cdn>
<e>1352362900</e>

Original comment by andrewcr...@gmail.com on 8 Nov 2012 at 8:34

GoogleCodeExporter commented 9 years ago 
i output the file to text so you can look at it, weirdly before it crashes it 
got one almighty huge data string

Original comment by andrewcr...@gmail.com on 8 Nov 2012 at 9:44

Attachments: