Fix jpeg encode error and ffmpeg param checking (#319)

* Fix exit fail when poll error

* Flush cache for jpeg cmdlist

* ffmpeg paramter check

* Remove limitation

Co-authored-by: zhangxiaojingCAN <104607452+zhangxiaojingCAN@users.noreply.github.com>

package/encode_app/src/main.cpp

@@ -479,8 +479,15 @@ static void *v4l2_output(void *arg)
   	iRet = poll(tFds, 1, /*-1*/3000);//3000ms
   	if (iRet <= 0)
     {
-      printf("poll error!\n");
-      continue;
+      printf("ch %d: poll error!\n", channel);
+
+      if(received_sigterm == 1)
+      {
+        sem_post(&pCtx->pSemGetData[channel]);
+        break;
+      }
+      else
+        continue;
     }
 
     struct v4l2_buffer buf;
@@ -511,7 +518,7 @@ static void *v4l2_output(void *arg)
 
       if(pCtx->v4l2_rev[channel][pCtx->v4l2_wp[channel]].addr != V4L2_INVALID_INDEX)
       {
-          printf("v4l2 buffer overflow\n");
+          printf("ch %d: v4l2 buffer overflow\n", channel);
           enqueue_buf(buf.index, channel);
       }
       else if(time - start_time < 1000000000)

package/ffmpeg_canaan/0035-buildroot-ffmpeg.patch

@@ -0,0 +1,13 @@
+Index: b/libavcodec/libk510_h264.c
+===================================================================
+--- a/libavcodec/libk510_h264.c
++++ b/libavcodec/libk510_h264.c
+@@ -409,7 +409,7 @@ static const AVOption options[] =
+   //{ option name,            description,                            offset in the context object,    type             default, min, max, flags, unit}
+   // ***** GOP options ******
+   { "g",                    "Set gop size",                                   OFFSET(gop_size),        AV_OPT_TYPE_INT,  {.i64 = 25}, 0, 1000, FLAGS },
+-  { "b",                    "Set video bitrate",                              OFFSET(bit_rate),        AV_OPT_TYPE_INT,  {.i64 = 4000000}, 0, 20000000, FLAGS },
++  { "b",                    "Set video bitrate",                              OFFSET(bit_rate),        AV_OPT_TYPE_INT,  {.i64 = 4000000}, 1000, 20000000, FLAGS },
+   { "r",                    "Set video framerate",                            OFFSET(framerate),       AV_OPT_TYPE_INT,  {.i64 = 30}, 30, 30, FLAGS },
+   { "ch",                   "Set encode channel ",                            OFFSET(channel),         AV_OPT_TYPE_INT,  {.i64 = 0}, 0, (VENC_MAX_CHANNELS-1), FLAGS },
+   { "idr_freq",             "IDR frequency. -1=No IDRs",                      OFFSET(idrFreq),         AV_OPT_TYPE_INT,  {.i64 = 25 }, -1, 256, FLAGS },