> All is good but the duration of the output vidéo is two time
> long than the input video duration.
> For example, if I the duration of the input vidéo is 10s the
> duration of the output will be 20s (10sx2) and the output video
> is slow.
Is it possible you are setting the timebase to be twice what it should be
> /* In this example, we transcode to same properties (picture
> size,
> * sample rate etc.). These properties can be changed for output
> * streams easily using filters */
> if (dec_ctx->codec_type == AVMEDIA_TYPE_VIDEO)
> {
> enc_ctx->time_base=dec_ctx->time_base;
> /* video time_base can be set to whatever is handy and
> supported by encoder */
> enc_ctx->time_base = av_inv_q(dec_ctx->framerate);
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