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  • Decrypting fragmented mpeg-dash using ffmpeg

    6 octobre 2022, par Sayem Prodhan Ananta

    I have an mpeg-dash which I want to decrypt. I have the CENC decryption key. But I am unable to get it working. The dash uses segment template. Here is the dash

    


    &lt;?xml version="1.0" ?>&#xA;<mpd mediapresentationduration="PT1H55M53.987S" minbuffertime="PT6.00S" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" xmlns="urn:mpeg:dash:schema:mpd:2011">&#xA;  &#xA;  <period>&#xA;    &#xA;    <adaptationset maxheight="720" maxwidth="1280" mimetype="video/mp4" segmentalignment="true" startwithsap="1">&#xA;      <accessibility schemeiduri="urn:scte:dash:cc:cea-608:2015" value="eng"></accessibility>&#xA;      <viewpoint schemeiduri="urn:mpeg:dash:role:2011" value="vp2"></viewpoint>&#xA;      &#xA;      <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95">&#xA;        pAIAAAEAAQCaAjwAVwBSAE0ASABFAEEARABFAFIAIAB4AG0AbABuAHMAPQAiAGgAdAB0AHAAOgAvAC8AcwBjAGgAZQBtAGEAcwAuAG0AaQBjAHIAbwBzAG8AZgB0AC4AYwBvAG0ALwBEAFIATQAvADIAMAAwADcALwAwADMALwBQAGwAYQB5AFIAZQBhAGQAeQBIAGUAYQBkAGUAcgAiACAAdgBlAHIAcwBpAG8AbgA9ACIANAAuADAALgAwAC4AMAAiAD4APABEAEEAVABBAD4APABQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsARQBZAEwARQBOAD4AMQA2ADwALwBLAEUAWQBMAEUATgA&#x2B;ADwAQQBMAEcASQBEAD4AQQBFAFMAQwBUAFIAPAAvAEEATABHAEkARAA&#x2B;ADwALwBQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsASQBEAD4AOABoAFcAMwBQAEsAeABPAEkAYwB1AGsAVwBWAHgASwBaAHgAMgA3AEMAZwA9AD0APAAvAEsASQBEAD4APABDAEgARQBDAEsAUwBVAE0APgBBAGQARgAvAFEAcwBzAHEATQBhAEEAPQA8AC8AQwBIAEUAQwBLAFMAVQBNAD4APABMAEEAXwBVAFIATAA&#x2B;AGgAdAB0AHAAOgAvAC8AcAByAC4AcwBlAHIAdgBpAGMAZQAuAGUAeABwAHIAZQBzAHMAcABsAGEAeQAuAGMAbwBtAC8AcABsAGEAeQByAGUAYQBkAHkALwBSAGkAZwBoAHQAcwBNAGEAbgBhAGcAZQByAC4AYQBzAG0AeAA8AC8ATABBAF8AVQBSAEwAPgA8AC8ARABBAFQAQQA&#x2B;ADwALwBXAFIATQBIAEUAQQBEAEUAUgA&#x2B;AA==&#xA;      </contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">&#xA;        AAAAQ3Bzc2gAAAAA7e&#x2B;LqXnWSs6jyCfc1R0h7QAAACMIARIQPLcV8k6syyGkWVxKZx27ChoKaW50ZXJ0cnVzdCIBKg==&#xA;      </contentprotection>&#xA;      <segmenttemplate duration="6000" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/seg-$Number$.m4s" startnumber="1" timescale="1000"></segmenttemplate>&#xA;      <representation bandwidth="634478" codecs="avc1.4D401F" framerate="2997/100" height="288" scantype="progressive" width="512"></representation>&#xA;      <representation bandwidth="789637" codecs="avc1.4D401F" framerate="2997/100" height="360" scantype="progressive" width="640"></representation>&#xA;      <representation bandwidth="1562569" codecs="avc1.4D401F" framerate="2997/100" height="432" scantype="progressive" width="768"></representation>&#xA;      <representation bandwidth="2124583" codecs="avc1.4D401F" framerate="2997/100" height="720" scantype="progressive" width="1280"></representation>&#xA;    </adaptationset>&#xA;    &#xA;    <adaptationset lang="en" mimetype="audio/mp4" segmentalignment="true" startwithsap="1">&#xA;      &#xA;      <contentprotection schemeiduri="urn:mpeg:dash:mp4protection:2011" value="cenc"></contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:9a04f079-9840-4286-ab92-e65be0885f95">&#xA;        pAIAAAEAAQCaAjwAVwBSAE0ASABFAEEARABFAFIAIAB4AG0AbABuAHMAPQAiAGgAdAB0AHAAOgAvAC8AcwBjAGgAZQBtAGEAcwAuAG0AaQBjAHIAbwBzAG8AZgB0AC4AYwBvAG0ALwBEAFIATQAvADIAMAAwADcALwAwADMALwBQAGwAYQB5AFIAZQBhAGQAeQBIAGUAYQBkAGUAcgAiACAAdgBlAHIAcwBpAG8AbgA9ACIANAAuADAALgAwAC4AMAAiAD4APABEAEEAVABBAD4APABQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsARQBZAEwARQBOAD4AMQA2ADwALwBLAEUAWQBMAEUATgA&#x2B;ADwAQQBMAEcASQBEAD4AQQBFAFMAQwBUAFIAPAAvAEEATABHAEkARAA&#x2B;ADwALwBQAFIATwBUAEUAQwBUAEkATgBGAE8APgA8AEsASQBEAD4AOABoAFcAMwBQAEsAeABPAEkAYwB1AGsAVwBWAHgASwBaAHgAMgA3AEMAZwA9AD0APAAvAEsASQBEAD4APABDAEgARQBDAEsAUwBVAE0APgBBAGQARgAvAFEAcwBzAHEATQBhAEEAPQA8AC8AQwBIAEUAQwBLAFMAVQBNAD4APABMAEEAXwBVAFIATAA&#x2B;AGgAdAB0AHAAOgAvAC8AcAByAC4AcwBlAHIAdgBpAGMAZQAuAGUAeABwAHIAZQBzAHMAcABsAGEAeQAuAGMAbwBtAC8AcABsAGEAeQByAGUAYQBkAHkALwBSAGkAZwBoAHQAcwBNAGEAbgBhAGcAZQByAC4AYQBzAG0AeAA8AC8ATABBAF8AVQBSAEwAPgA8AC8ARABBAFQAQQA&#x2B;ADwALwBXAFIATQBIAEUAQQBEAEUAUgA&#x2B;AA==&#xA;      </contentprotection>&#xA;      &#xA;      <contentprotection schemeiduri="urn:uuid:edef8ba9-79d6-4ace-a3c8-27dcd51d21ed">&#xA;        AAAAQ3Bzc2gAAAAA7e&#x2B;LqXnWSs6jyCfc1R0h7QAAACMIARIQPLcV8k6syyGkWVxKZx27ChoKaW50ZXJ0cnVzdCIBKg==&#xA;      </contentprotection>&#xA;      <segmenttemplate duration="6000" initialization="$RepresentationID$/init.mp4" media="$RepresentationID$/seg-$Number$.m4s" startnumber="1" timescale="1000"></segmenttemplate>&#xA;      <representation audiosamplingrate="48000" bandwidth="136225" codecs="mp4a.40.2">&#xA;        <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>&#xA;      </representation>&#xA;    </adaptationset>&#xA;  </period>&#xA;</mpd>&#xA;

    &#xA;

    I have produced an mp4 file by combining all the segments like this

    &#xA;

    init.mp4&#x2B;seg-1.m4s&#x2B;seg-2.m4s&#x2B;....&#x2B;seg-1159.m4s&#xA;

    &#xA;

    But I end up with following error

    &#xA;

    ffmpeg version N-99631-g9018257751-anan5a-2020-10-19 Copyright (c) 2000-2020 the FFmpeg developers&#xA;  built with gcc 8 (Debian 8.3.0-6)&#xA;  configuration: --extra-version=anan5a-2020-10-19 --enable-gpl --enable-version3 --disable-shared --enable-static --enable-small --enable-avisynth --enable-chromaprint --enable-frei0r --enable-gmp --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-librtmp --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libxml2 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-openal --enable-opencl --enable-opengl --enable-libdrm --enable-nonfree --enable-libfdk-aac --enable-libbluray --enable-libzimg --enable-libsvtav1&#xA;  libavutil      56. 60.100 / 56. 60.100&#xA;  libavcodec     58.111.101 / 58.111.101&#xA;  libavformat    58. 62.100 / 58. 62.100&#xA;  libavdevice    58. 11.102 / 58. 11.102&#xA;  libavfilter     7. 87.100 /  7. 87.100&#xA;  libswscale      5.  8.100 /  5.  8.100&#xA;  libswresample   3.  8.100 /  3.  8.100&#xA;  libpostproc    55.  8.100 / 55.  8.100&#xA;[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Incorrect number of samples in encryption info&#xA;[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none, 512x288, 616 kb/s): unspecified pixel format&#xA;Consider increasing the value for the &#x27;analyzeduration&#x27; (0) and &#x27;probesize&#x27; (5000000) options&#xA;Input #0, mov,mp4,m4a,3gp,3g2,mj2, from &#x27;../videos/enc.0a7bd4e9ec72b6e0-5549.mkv&#x27;:&#xA;  Metadata:&#xA;    major_brand     : isom&#xA;    minor_version   : 512&#xA;    compatible_brands: isomiso2avc1mp41iso5iso6&#xA;  Duration: 01:55:47.95, bitrate: 625 kb/s&#xA;    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 512x288, 616 kb/s, SAR 1:1 DAR 16:9, 29.97 fps, 11988 tbr, 11988 tbn, 23976 tbc (default)&#xA;    Metadata:&#xA;      handler_name    : Bento4 Video Handler&#xA;    Side data:&#xA;      unknown side data type 24 (779 bytes)&#xA;Output #0, matroska, to &#x27;../videos/dec.0a7bd4e9ec72b6e0-5549.mkv&#x27;:&#xA;  Metadata:&#xA;    major_brand     : isom&#xA;    minor_version   : 512&#xA;    compatible_brands: isomiso2avc1mp41iso5iso6&#xA;    encoder         : Lavf58.62.100&#xA;    Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), none, 512x288 [SAR 1:1 DAR 16:9], q=2-31, 616 kb/s, 29.97 fps, 11988 tbr, 1k tbn, 11988 tbc (default)&#xA;    Metadata:&#xA;      handler_name    : Bento4 Video Handler&#xA;    Side data:&#xA;      unknown side data type 24 (779 bytes)&#xA;Stream mapping:&#xA;  Stream #0:0 -> #0:0 (copy)&#xA;Press [q] to stop, [?] for help&#xA;[mov,mp4,m4a,3gp,3g2,mj2 @ 0x557789b49300] Incorrect number of samples in encryption info&#xA;../videos/enc.0a7bd4e9ec72b6e0-5549.mkv: Invalid data found when processing input&#xA;frame=    0 fps=0.0 q=-1.0 Lsize=       1kB time=00:00:00.00 bitrate=N/A speed=   0x    &#xA;video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown&#xA;

    &#xA;

    How can I achieve the decryption without error ??

    &#xA;

  • avformat/dashdec : add dash demuxer base version

    9 septembre 2017, par Steven Liu
    avformat/dashdec : add dash demuxer base version

    ffmpeg need a dash demuxer for demux the dash formats base on
    
https://github.com/samsamsam-iptvplayer/exteplayer3/blob/master/tmp/ffmpeg/patches/3.2.2/000001_add_dash_demux.patch
    

    TODO :
    
1. support multi bitrate dash.
    

    v2 fixed :
    
1. from autodetect to disabled
    
2. from camelCase code style to ffmpeg code style
    
3. from RepType to AVMediaType
    
4. fix variable typo
    
5. change time value from uint32_t to uint64_t
    
6. removed be used once API
    
7. change 'time(NULL)`, except it is not 2038-safe.' to av_gettime and av_timegm
    
8. merge complex free operation to free_fragment
    
9. use API from snprintf to av_asprintf
    

    v3 fixed :
    
1. fix typo from —enabled-xml2 to —enable-xml2
    

    v4 fixed :
    
1. from —enable-xml2 to —enable-libxml2
    
2. move system includes to top
    
3. remove nouse includes
    
4. rename enum name
    
5. add a trailing comma for the last entry enum
    
6. fix comment typo
    
7. add const to DASHContext class front
    
8. check sscanf if return arguments and give warning message when error
    
9. check validity before free seg->url and seg
    
10. check if the val is null, before use atoll
    

    v5 fixed :
    
1. fix typo from mainifest to manifest
    

    v6 fixed :
    
1. from realloc to av_realloc
    
2. from free to av_free
    

    v7 fixed :
    
1. remove the -lxml2 from configure when require_pkg_config
    

    v8 fixed :
    
1. fix replace filename template by av_asprintf secure problem
    

    v9 modified :
    
1. make manifest parser clearly
    

    v10 fixed :
    
1. fix function API name code style
    
2. remove redundant strreplace call
    
3. remove redundant memory operation and check return value from get_content_url()
    
4. add space between ) and 
    
5. remove no need to log the value for print
    

    v11 fixed :
    
1. from atoll to strtoll
    
Suggested-by : Michael Niedermayer <michael@niedermayer.cc>
    

    v12 fixed :
    
1. remove strreplace and instead by av_strreplace
    
Suggested-by : Nicolas George <george@nsup.org>
    

    v13 fixed :
    
1. fix bug : cannot play :
    
http://dash.edgesuite.net/akamai/bbb_30fps/bbb_30fps.mpd
    
Reported-by : Andy Furniss <adf.lists@gmail.com>
    

    v14 fixed :
    
1. fix bug : TLS connection was non-properly terminated
    
2. fix bug : No trailing CRLF found in HTTP header
    
Reported-by : Andy Furniss <adf.lists@gmail.com>
    

    v15 fixed :
    
1. play youtube link : ffmpeg -i $(youtube-dl -J "https://www.youtube.com/watch?v=XmL19DOP_Ls" ; | jq -r ".requested_formats[0].manifest_url")
    
2. code refine for timeline living stream
    
Reported-by : Ricardo Constantino <wiiaboo@gmail.com>
    

    v16 fixed :
    
1. remove the snprintf and instead by get_segment_filename make safety
    
2. remove unnecessary loops
    
3. updated xmlStrcmp and xmlFree to av_* functions
    
4. merge code repeat into one function
    
5. add memory alloc faild check
    
6. update update_init_section and open_url
    
7. output safety error message when filename template not safe
    
Suggested-by : wm4 <nfxjfg@googlemail.com>
    

    v17 fixed :
    
1. add memory alloc faild check
    
2. fix resource space error at free_representation
    

    v18 fixed :
    
1. add condition of template format
    

    v19 fixed :
    
1. fix typo of the option describe
    

    v20 fixed :
    
1. add the c->base_url alloc check
    
2. make the DASHTmplId same to dashenc
    

    v21 fixed :
    
1. remove get_repl_pattern_and_format and get_segment_filename
    
2. process use dashcomm APIs
    

    v22 fixed :
    
1. modify the include "dashcomm.h" to include "dash.h"
    
2. use internal API from dash_fill_tmpl_params to ff_dash_fill_tmpl_params
    

    Signed-off-by : Steven Liu <lq@onvideo.cn>
    
Signed-off-by : samsamsam <samsamsam@o2.pl>
    • [DH] configure
    • [DH] libavformat/Makefile
    • [DH] libavformat/allformats.c
    • [DH] libavformat/dashdec.c

  • FFMPEG segment live video for DASH

    23 décembre 2014, par static

    I’m trying to stream live capture of desktop to my own server, which shall create an MPD with segment template for use with dash.js player.
    Using the following command i managed to get it working

    ffmpeg -rtbufsize 6M -f x11grab -s 1366x768 -r 10 -i :0.0 -flags +global_header \
    
-vcodec libvpx -deadline realtime -profile:v 0 -keyint_min 1 -g 1 -cpu-used 0 \
    
-vb 1200k -qmin 10 -qmax 42 -threads 4 -bufsize 6000k -slices 4 -map 0 -an \
    
-f stream_segment -segment_time 2 -segment_format webm **/streams

    The output :

    Input #0, x11grab, from ':0.0': Duration: N/A, start: 1419329032.549498, bitrate: N/A
    
Stream #0:0: Video: rawvideo (BGRA / 0x41524742), bgra, 1366x768, 10 fps, 10 tbr, 1000k tbn, 10 tbc
    
[libvpx@ 0x23ccf60] v1.3.0 Output #0, stream_segment, ssegment, to /streams/d':
    
Metadata:
    
encoder : Lavf56.15.102
    
Stream #0:0: Video: vp8 (libvpx), yuva420p, 1366x768, q=10-42, 1200 kb/s, 10 fps, 1k tbn, 10 tbc
    
Metadata: encoder: Lavc56.13.100 libvpx
    
Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> vp8 (libvpx))
    
Press [q] to stop, [?] for help
    
[swscaler @ 0x23ac0c0] Warning: data is not aligned! This can lead to a speedloss
    
frame= 2839 fps= 10 q=0.0 Lsize=N/A time=00:04:43.90 bitrate=N/A
    
video:135246kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

    If I increase the number of frames to produce better quality, the latency drastically increases and the stream is not in sync with the MPD. This is caused by the fact that keyframes are created at every frame -keyint_min 1 -g 1 because otherwise and error MEDIA_ERR_SRC_NOT_SUPPORTED is thrown by the player. This is probably because a keyframe must be found at the beginning of each segment.

    Could ffmpeg be used to generate keyframes as the first frame in each segment ? I try different values for -keyint_min x -g y, for example number of frames but with no result (probably because the number of frames stabilized after a couple a seconds, so the first 2-3 segments were produced with inconsistent number of frames, so all the keyframes were introduced in wrong positions in the segments).

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