[FFmpeg-cvslog] avformat/matroska: Support JPEG2000 for demuxing

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sun May 25 03:31:17 2025 +0200| [8a936b8726e10d84a06cacc872d267020f1ef156] | committer: Andreas Rheinhardt

avformat/matroska: Support JPEG2000 for demuxing

Legal since commit 1cd0a9be4b2d1e7c60184ec68404e00e46e3123e
(Jan 4) in the Cellar Matroska specification git repo.
We still hold out on muxing it due to compatibility with
old demuxers.

Reviewed-by: compn <ff at hawaiiantel.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8a936b8726e10d84a06cacc872d267020f1ef156
---

 libavformat/matroska.c    | 1 +
 libavformat/matroskaenc.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/matroska.c b/libavformat/matroska.c
index bbad9a7f54..60584e2687 100644
--- a/libavformat/matroska.c
+++ b/libavformat/matroska.c
@@ -82,6 +82,7 @@ const CodecTags ff_mkv_codec_tags[]={
     {"V_AVS3"           , AV_CODEC_ID_AVS3},
     {"V_DIRAC"          , AV_CODEC_ID_DIRAC},
     {"V_FFV1"           , AV_CODEC_ID_FFV1},
+    {"V_JPEG2000"       , AV_CODEC_ID_JPEG2000},
     {"V_MJPEG"          , AV_CODEC_ID_MJPEG},
     {"V_MPEG1"          , AV_CODEC_ID_MPEG1VIDEO},
     {"V_MPEG2"          , AV_CODEC_ID_MPEG2VIDEO},
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 6d0d791f18..9d13f74907 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1960,8 +1960,8 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
 
         // look for a codec ID string specific to mkv to use,
         // if none are found, use AVI codes
-        if (par->codec_id == AV_CODEC_ID_FFV1) {
-            /* FFV1 is actually supported natively in Matroska,
+        if (par->codec_id == AV_CODEC_ID_FFV1 || par->codec_id == AV_CODEC_ID_JPEG2000) {
+            /* FFV1 and JPEG2000 are actually supported natively in Matroska,
              * yet we use the VfW way to mux it for compatibility
              * with old demuxers. (FIXME: Are they really important?) */
         } else if (par->codec_id != AV_CODEC_ID_RAWVIDEO || par->codec_tag) {