On 3/22/2024 1:01 PM, James Almer wrote:
Otherwise it would not be lossless.

Signed-off-by: James Almer <jamr...@gmail.com>
---
  libavutil/channel_layout.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/libavutil/channel_layout.c b/libavutil/channel_layout.c
index a83618bcc7..3054ee08a5 100644
--- a/libavutil/channel_layout.c
+++ b/libavutil/channel_layout.c
@@ -902,9 +902,11 @@ int av_channel_layout_retype(AVChannelLayout 
*channel_layout, enum AVChannelOrde
              lossy = 1;
          }
          if (!lossy || allow_lossy) {
+            void *opaque = channel_layout->opaque;
              av_channel_layout_uninit(channel_layout);
              channel_layout->order       = AV_CHANNEL_ORDER_UNSPEC;
              channel_layout->nb_channels = nb_channels;
+            channel_layout->opaque      = opaque;
              return lossy;
          }
          return AVERROR(ENOSYS);
@@ -916,8 +918,10 @@ int av_channel_layout_retype(AVChannelLayout 
*channel_layout, enum AVChannelOrde
                  return AVERROR(ENOSYS);
              lossy = has_channel_names(channel_layout);
              if (!lossy || allow_lossy) {
+                void *opaque = channel_layout->opaque;
                  av_channel_layout_uninit(channel_layout);
                  av_channel_layout_from_mask(channel_layout, mask);
+                channel_layout->opaque = opaque;
                  return lossy;
              }
          }
@@ -925,6 +929,7 @@ int av_channel_layout_retype(AVChannelLayout 
*channel_layout, enum AVChannelOrde
      case AV_CHANNEL_ORDER_CUSTOM: {
          AVChannelLayout custom = { 0 };
          int ret = av_channel_layout_custom_init(&custom, 
channel_layout->nb_channels);
+        void *opaque = channel_layout->opaque;
          if (ret < 0)
              return ret;
          if (channel_layout->order != AV_CHANNEL_ORDER_UNSPEC)
@@ -932,6 +937,7 @@ int av_channel_layout_retype(AVChannelLayout 
*channel_layout, enum AVChannelOrde
                  custom.u.map[i].id = 
av_channel_layout_channel_from_index(channel_layout, i);
          av_channel_layout_uninit(channel_layout);
          *channel_layout = custom;
+        channel_layout->opaque = opaque;
          return 0;
          }
      case AV_CHANNEL_ORDER_AMBISONIC:
@@ -946,10 +952,12 @@ int av_channel_layout_retype(AVChannelLayout 
*channel_layout, enum AVChannelOrde
                  return AVERROR(ENOSYS);
              lossy = has_channel_names(channel_layout);
              if (!lossy || allow_lossy) {
+                void *opaque = channel_layout->opaque;
                  av_channel_layout_uninit(channel_layout);
                  channel_layout->order       = AV_CHANNEL_ORDER_AMBISONIC;
                  channel_layout->nb_channels = nb_channels;
                  channel_layout->u.mask      = mask;
+                channel_layout->opaque      = opaque;
                  return lossy;
              }
          }

Will apply.
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