Ubuntu 22.04, ffmpeg n6.1.1 : Unrecognized option 'cenc_decryption_key'.

[peddanet]

Any help with this , using ffmpeg 4 on ubuntu 18 and got Unrecognized option 'cenc_decryption_key'.
Error splitting the argument list: Option not found error

The issue arises also with Ubuntu 22.04 and ffmpeg n6.1.1! Nobody experiencing this issue ?? Any solution hints?

[Selur]

never used the option (I don't capture stuff), but it is from libavformat/dashdec.c ,

static const AVOption dash_options[] = {
    {"allowed_extensions", "List of file extensions that dash is allowed to access",
        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
        {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
        INT_MIN, INT_MAX, FLAGS},
    { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
    {NULL}
};

see: https://ffmpeg.org/doxygen/trunk/dashdec_8c_source.html

So the libav version you are using might be the problem.

[peddanet]

never used the option (I don't capture stuff), but it is from libavformat/dashdec.c ,

static const AVOption dash_options[] = {
    {"allowed_extensions", "List of file extensions that dash is allowed to access",
        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
        {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
        INT_MIN, INT_MAX, FLAGS},
    { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
    {NULL}
};

see: https://ffmpeg.org/doxygen/trunk/dashdec_8c_source.html

So the libav version you are using might be the problem.

Hi thanks, I found this too, but, do you know how this could be used as a command line option in ffmpeg? It seems to me that

dash_options

as well as

dash_class

and

ff_dash_demuxer

are not referenced by anything else. Ok so how would be the libavformat lib be accessed from ffmpeg? I don't understand this exactly, for me it is unconnected to any leading ffmpeg process. That would explain why the option is invalid and not recognized when calling...

 #define OFFSET(x) offsetof(DASHContext, x)
 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
 static const AVOption dash_options[] = {
     {"allowed_extensions", "List of file extensions that dash is allowed to access",
         OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
         {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
         INT_MIN, INT_MAX, FLAGS},
     { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
     {NULL}
 };
 
 static const AVClass dash_class = {
     .class_name = "dash",
     .item_name  = av_default_item_name,
     .option     = dash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 const AVInputFormat ff_dash_demuxer = {
     .name           = "dash",
     .long_name      = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
     .priv_class     = &dash_class,
     .priv_data_size = sizeof(DASHContext),
     .flags_internal = FF_FMT_INIT_CLEANUP,
     .read_probe     = dash_probe,
     .read_header    = dash_read_header,
     .read_packet    = dash_read_packet,
     .read_close     = dash_close,
     .read_seek      = dash_read_seek,
     .flags          = AVFMT_NO_BYTE_SEEK,
 };

So do you know how the external defined ff_dash_demuxer is used here in fffmpeg? And how AVInputFormat is used to parse the command line?

[october262]

never used the option (I don't capture stuff), but it is from libavformat/dashdec.c ,

static const AVOption dash_options[] = {
    {"allowed_extensions", "List of file extensions that dash is allowed to access",
        OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
        {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
        INT_MIN, INT_MAX, FLAGS},
    { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
    {NULL}
};

see: https://ffmpeg.org/doxygen/trunk/dashdec_8c_source.html

So the libav version you are using might be the problem.

Hi thanks, I found this too, but, do you know how this could be used as a command line option in ffmpeg? It seems to me that

dash_options

as well as

dash_class

and

ff_dash_demuxer

are not referenced by anything else. Ok so how would be the libavformat lib be accessed from ffmpeg? I don't understand this exactly, for me it is unconnected to any leading ffmpeg process. That would explain why the option is invalid and not recognized when calling...

 #define OFFSET(x) offsetof(DASHContext, x)
 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
 static const AVOption dash_options[] = {
     {"allowed_extensions", "List of file extensions that dash is allowed to access",
         OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
         {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
         INT_MIN, INT_MAX, FLAGS},
     { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS },
     {NULL}
 };
 
 static const AVClass dash_class = {
     .class_name = "dash",
     .item_name  = av_default_item_name,
     .option     = dash_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 const AVInputFormat ff_dash_demuxer = {
     .name           = "dash",
     .long_name      = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
     .priv_class     = &dash_class,
     .priv_data_size = sizeof(DASHContext),
     .flags_internal = FF_FMT_INIT_CLEANUP,
     .read_probe     = dash_probe,
     .read_header    = dash_read_header,
     .read_packet    = dash_read_packet,
     .read_close     = dash_close,
     .read_seek      = dash_read_seek,
     .flags          = AVFMT_NO_BYTE_SEEK,
 };

So do you know how the external defined ff_dash_demuxer is used here in fffmpeg? And how AVInputFormat is used to parse the command line?

what is the ffmpeg command that you are using ??
see this thread page 2 post #33 - https://forum.videohelp.com/threads/400424-Downloading-DRM-protected-video-and-decrypt...nown-key/page2

[Selur]

Like I wrote, I never used 'cenc_decryption_key', the used demuxer in ffmpeg will normally be decided depending on the input file.
Calling 'ffmpeg -demuxers' I get:

...
 D  dash            Dynamic Adaptive Streaming over HTTP
...

so this will probably only be used if the source is http/https.
I agree october262: What does your command line look like?