[Libav-user] Need help on encoding

Pierre Delmas pierre.delmas at centrale-marseille.fr
Thu May 11 15:44:26 EEST 2017


I need a little help on video. What I want to do is to modify a motion
vector to embed some datas (I do steganography in research) and to write
a new video with out loss of datas.

Currently I can write a video (just with I-frames and P-frames no
B-frames) but it seems that at a moment a filter came and erase my
datas. So is there any options to deactivate filters ?

I find a me_method to do that but it seems it doesn't work. I use it
like that :

AVDictionary *opts = NULL;
av_dict_set(&opts, "crf", "0", 0);
av_dict_set(&opts, "preset", "placebo", 0);

if (avcodec_open2(m_stream->codec, m_codec, &opts) < 0)
    throw -108;

Thank you for your help,

Best regards,

Delmas P.

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