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new 1d7b14f61d avformat/wavenc: Omit JUNK for non-seekable -rf64 auto
1d7b14f61d is described below
commit 1d7b14f61d66fdf18f15204c613df9d65396c319
Author: Daniel Verkamp <[email protected]>
AuthorDate: Wed Jul 22 00:05:54 2026 -0700
Commit: Daniel Verkamp <[email protected]>
CommitDate: Thu Aug 13 22:05:33 2026 +0000
avformat/wavenc: Omit JUNK for non-seekable -rf64 auto
The `-rf64 auto` option requires seeking in order to go back and convert
the reserved header space into a ds64 chunk when switching from RIFF to
RF64. If the output is not seekable, then it isn't possible to make use
of the space reserved with the JUNK chunk, so it is more reasonable to
just produce a regular RIFF with no JUNK chunk in this case, equivalent
to the `-rf64 never` option.
Signed-off-by: Daniel Verkamp <[email protected]>
---
libavformat/wavenc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavformat/wavenc.c b/libavformat/wavenc.c
index a8debf8faa..58579d2449 100644
--- a/libavformat/wavenc.c
+++ b/libavformat/wavenc.c
@@ -305,6 +305,10 @@ static int wav_write_header(AVFormatContext *s)
AVIOContext *pb = s->pb;
int64_t fmt;
+ if (wav->rf64 == RF64_AUTO && !(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
+ wav->rf64 = RF64_NEVER;
+ }
+
if (wav->rf64 == RF64_ALWAYS) {
ffio_wfourcc(pb, "RF64");
avio_wl32(pb, -1); /* RF64 chunk size: use size in ds64 */
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