+// maximum over s->mjpeg_vsample[i]
+#define V_MAX 2
+static int amv_encode_picture(AVCodecContext *avctx, AVPacket *pkt,
+ const AVFrame *pic_arg, int *got_packet)
+
+{
+ MpegEncContext *s = avctx->priv_data;
+ AVFrame *pic;
+ int i, ret;
+ int chroma_h_shift, chroma_v_shift;
+
+ av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_h_shift, &chroma_v_shift);
+
+ //CODEC_FLAG_EMU_EDGE have to be cleared
+ if(s->avctx->flags & CODEC_FLAG_EMU_EDGE)
+ return AVERROR(EINVAL);
+
+ if ((avctx->height & 15) && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Heights which are not a multiple of 16 might fail with some decoders, "
+ "use vstrict=-1 / -strict -1 to use %d anyway.\n", avctx->height);
+ av_log(avctx, AV_LOG_WARNING, "If you have a device that plays AMV videos, please test if videos "
+ "with such heights work with it and report your findings to ffmpeg-devel@ffmpeg.org\n");
+ return AVERROR_EXPERIMENTAL;
+ }
+
+ pic = av_frame_clone(pic_arg);
+ if (!pic)
+ return AVERROR(ENOMEM);
+ //picture should be flipped upside-down
+ for(i=0; i < 3; i++) {
+ int vsample = i ? 2 >> chroma_v_shift : 2;
+ pic->data[i] += pic->linesize[i] * (vsample * s->height / V_MAX - 1);
+ pic->linesize[i] *= -1;
+ }
+ ret = ff_mpv_encode_picture(avctx, pkt, pic, got_packet);
+ av_frame_free(&pic);
+ return ret;
+}
+
+#if CONFIG_MJPEG_ENCODER
+FF_MPV_GENERIC_CLASS(mjpeg)
+