libavfilter/af_channelmap.c:370: error: Integer Overflow L2
  ([0, 126] - 1):unsigned64 by call to `av_get_channel_layout_channel_index`.

libavfilter/af_channelmap.c:370:40: Call
368.     if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) {
369.         for (i = 0; i < s->nch; i++) {
370.             s->map[i].in_channel_idx = av_get_channel_layout_channel_index(
                                            ^
371.                 inlink->channel_layout, s->map[i].in_channel);
372.             if (s->map[i].in_channel_idx < 0) {

libavutil/audioconvert.c:201:9: Assignment
  199.     if (!(channel_layout & channel) ||
  200.         av_get_channel_layout_nb_channels(channel) != 1)
  201.         return AVERROR(EINVAL);
               ^
  202.     channel_layout &= channel - 1;
  203.     return av_get_channel_layout_nb_channels(channel_layout);

libavfilter/af_channelmap.c:370:13: Assignment
368.     if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) {
369.         for (i = 0; i < s->nch; i++) {
370.             s->map[i].in_channel_idx = av_get_channel_layout_channel_index(
                 ^
371.                 inlink->channel_layout, s->map[i].in_channel);
372.             if (s->map[i].in_channel_idx < 0) {

libavfilter/af_channelmap.c:370:40: Call
368.     if (s->mode == MAP_PAIR_STR_INT || s->mode == MAP_PAIR_STR_STR) {
369.         for (i = 0; i < s->nch; i++) {
370.             s->map[i].in_channel_idx = av_get_channel_layout_channel_index(
                                            ^
371.                 inlink->channel_layout, s->map[i].in_channel);
372.             if (s->map[i].in_channel_idx < 0) {

libavutil/audioconvert.c:196:1: <LHS trace>
194. }
195. 
196. int av_get_channel_layout_channel_index(uint64_t channel_layout,
     ^
197.                                         uint64_t channel)
198. {

libavutil/audioconvert.c:196:1: Parameter `channel`
  194. }
  195. 
  196. int av_get_channel_layout_channel_index(uint64_t channel_layout,
       ^
  197.                                         uint64_t channel)
  198. {

libavutil/audioconvert.c:202:5: Binary operation: ([0, 126] - 1):unsigned64 by call to `av_get_channel_layout_channel_index` 
  200.         av_get_channel_layout_nb_channels(channel) != 1)
  201.         return AVERROR(EINVAL);
  202.     channel_layout &= channel - 1;
           ^
  203.     return av_get_channel_layout_nb_channels(channel_layout);
  204. }
