avcodec/libx26[45]: add udu_sei option to import user data unregistered SEIs

Most of user data unregistered SEIs are privated data which defined by user/
encoder. currently, the user data unregistered SEIs found in input are forwarded
as side-data to encoders directly, it'll cause the reencoded output including some
useless UDU SEIs.

I prefer to add one option to enable/disable it and default is off after I saw
the patch by Andreas Rheinhardt:

https://patchwork.ffmpeg.org/project/ffmpeg/patch/AM7PR03MB66607C2DB65E1AD49D975CF18F7B9@AM7PR03MB6660.eurprd03.prod.outlook.com/

How to test by cli:
ffmpeg -y -f lavfi -i testsrc -c:v libx264 -frames:v 1 a.ts
ffmpeg -y -i a.ts -c:v libx264 -udu_sei 1 b.ts
ffmpeg -y -i a.ts -c:v libx264 -udu_sei 0 c.ts

# check the user data unregistered SEIs, you'll see two UDU SEIs for b.ts.
# and mediainfo will show with wrong encoding setting info
ffmpeg -i b.ts -vf showinfo -f null -
ffmpeg -i c.ts -vf showinfo -f null -

This fixes tickets #9500 and #9557.

Reviewed-by: "zhilizhao(赵志立)" <quinkblack@foxmail.com>
Signed-off-by: Limin Wang <lance.lmwang@gmail.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/libavcodec/libx264.c b/libavcodec/libx264.c
index 2b680abf21..9836818b99 100644
--- a/libavcodec/libx264.c
+++ b/libavcodec/libx264.c
@@ -104,6 +104,7 @@ typedef struct X264Context {
     int chroma_offset;
     int scenechange_threshold;
     int noise_reduction;
+    int udu_sei;
 
     AVDictionary *x264_params;
 
@@ -464,6 +465,7 @@ static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame,
             }
         }
 
+        if (x4->udu_sei) {
         for (int j = 0; j < frame->nb_side_data; j++) {
             AVFrameSideData *side_data = frame->side_data[j];
             void *tmp;
@@ -487,6 +489,7 @@ static int X264_frame(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame,
             sei_payload->payload_type = SEI_TYPE_USER_DATA_UNREGISTERED;
             sei->num_payloads++;
         }
+        }
     }
 
     do {
@@ -1168,7 +1171,7 @@ static const AVOption options[] = {
     { "chromaoffset", "QP difference between chroma and luma",            OFFSET(chroma_offset), AV_OPT_TYPE_INT, { .i64 = 0 }, INT_MIN, INT_MAX, VE },
     { "sc_threshold", "Scene change threshold",                           OFFSET(scenechange_threshold), AV_OPT_TYPE_INT, { .i64 = -1 }, INT_MIN, INT_MAX, VE },
     { "noise_reduction", "Noise reduction",                               OFFSET(noise_reduction), AV_OPT_TYPE_INT, { .i64 = -1 }, INT_MIN, INT_MAX, VE },
-
+    { "udu_sei",      "Use user data unregistered SEI if available",      OFFSET(udu_sei),  AV_OPT_TYPE_BOOL,   { .i64 = 0 }, 0, 1, VE },
     { "x264-params",  "Override the x264 configuration using a :-separated list of key=value parameters", OFFSET(x264_params), AV_OPT_TYPE_DICT, { 0 }, 0, 0, VE },
     { NULL },
 };