On 4/18/2024 5:19 PM, Frank Plowman wrote:
On 18/04/2024 20:43, James Almer wrote:
On 4/18/2024 3:59 PM, Frank Plowman wrote:
The native VVC decoder does not yet support quality/spatial/multiview
scalability. Bitstreams requiring this feature could cause crashes.
Patch fixes this by skipping NAL units which are not in the base layer,
warning the user while doing so.
Signed-off-by: Frank Plowman <p...@frankplowman.com>
---
libavcodec/vvc/dec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/vvc/dec.c b/libavcodec/vvc/dec.c
index a4fc40b40a..5249ddf989 100644
--- a/libavcodec/vvc/dec.c
+++ b/libavcodec/vvc/dec.c
@@ -785,6 +785,11 @@ static int decode_nal_unit(VVCContext *s,
VVCFrameContext *fc, const H2645NAL *n
s->temporal_id = nal->temporal_id;
+ if (nal->nuh_layer_id > 0) {
+ avpriv_report_missing_feature(fc->log_ctx, "Multilayer");
A more verbose message would be better.
Thanks for your review James.
Would "Quality/spatial/multiview scalability" be better or do you have
some other suggestion? The message is put in a template by
avpriv_report_missing_feature, e.g.
[vvc @ 0x618000003c80] Multilayer is not implemented. Update your FFmpeg
version to the newest one from Git. If the problem still occurs, it
means that your file has a feature which has not been implemented.
so the string passed to avpriv_report_missing_feature must be a noun.
Maybe "Decoding of multilayer bitstreams".
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