This patch applies against zoneminder 1.30.4 branch. It fails against the master branch.

ffmpeg35_buildfix.patch

--- a/src/zm_mpeg.cpp
+++ b/src/zm_mpeg.cpp
@@ -29,6 +29,7 @@
 {
 #include <libavutil/mathematics.h>
 #include <libavcodec/avcodec.h>
+#define 	AVFMT_RAWPICTURE   0x0020
 }
 
 bool VideoStream::initialised = false;
@@ -240,7 +241,7 @@
     {
       // Quality based bitrate control (VBR). Scale is 1..31 where 1 is best.
       // This gets rid of artifacts in the beginning of the movie; and well, even quality.
-      c->flags |= CODEC_FLAG_QSCALE;
+      c->flags |= AV_CODEC_FLAG_QSCALE;
       c->global_quality = FF_QP2LAMBDA * (31 - (31 * (bitrate / 100.0)));
     }
     else
@@ -265,7 +266,7 @@
 
     // some formats want stream headers to be separate
     if ( of->flags & AVFMT_GLOBALHEADER )
-      c->flags |= CODEC_FLAG_GLOBAL_HEADER;
+      c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
   }
   else
   {

--- a/src/zm_sdp.cpp
+++ b/src/zm_sdp.cpp
@@ -483,7 +483,7 @@
           uint8_t *dest = 
           (uint8_t *)av_malloc(packet_size + sizeof(start_sequence) +
                        stream->codec->extradata_size +
-                       FF_INPUT_BUFFER_PADDING_SIZE);
+                       AV_INPUT_BUFFER_PADDING_SIZE);
           if(dest) {
               if(stream->codec->extradata_size) {
                 // av_realloc?
@@ -494,7 +494,7 @@
               memcpy(dest+stream->codec->extradata_size, start_sequence, sizeof(start_sequence));
               memcpy(dest+stream->codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
               memset(dest+stream->codec->extradata_size+sizeof(start_sequence)+
-                     packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+                     packet_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
 
               stream->codec->extradata= dest;
               stream->codec->extradata_size+= sizeof(start_sequence)+packet_size;