Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
 help / color / mirror / Atom feed
* [FFmpeg-devel] [PATCH] avcodec/bsf/h264_mp4toannexb.c: change extradata to annexb if this is avcc.
@ 2025-04-24  3:38 jiangjie
  2025-04-24  4:19 ` Zhao Zhili
  2025-04-24 12:42 ` jiangjie
  0 siblings, 2 replies; 11+ messages in thread
From: jiangjie @ 2025-04-24  3:38 UTC (permalink / raw)
  To: ffmpeg-devel; +Cc: jiangjie618

if get AV_PKT_DATA_NEW_EXTRADATA in AVPacket, this bitstream filter will return an error.
ffmpeg -i rtmp://xxx/live/xxx -bsf:v "h264_mp4toannexb,h264_metadata=aud=remove" -c copy -f null -
---
 libavcodec/bsf/h264_mp4toannexb.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/libavcodec/bsf/h264_mp4toannexb.c b/libavcodec/bsf/h264_mp4toannexb.c
index dda064287e..4cd002d166 100644
--- a/libavcodec/bsf/h264_mp4toannexb.c
+++ b/libavcodec/bsf/h264_mp4toannexb.c
@@ -252,14 +252,21 @@ static int h264_mp4toannexb_filter_ps(H264BSFContext *s,
     return 0;
 }
 
+static int is_annexb(const uint8_t *extradata, int extra_size) {
+    if (!extra_size || (extra_size >= 3 && AV_RB24(extradata) == 1) ||
+        (extra_size >= 4 && AV_RB32(extradata) == 1)) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
 static int h264_mp4toannexb_init(AVBSFContext *ctx)
 {
     int extra_size = ctx->par_in->extradata_size;
 
     /* retrieve sps and pps NAL units from extradata */
-    if (!extra_size                                               ||
-        (extra_size >= 3 && AV_RB24(ctx->par_in->extradata) == 1) ||
-        (extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
+    if (is_annexb(ctx->par_in->extradata, extra_size)) {
         av_log(ctx, AV_LOG_VERBOSE,
                "The input looks like it is Annex B already\n");
     } else if (extra_size >= 7) {
@@ -294,9 +301,16 @@ static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
     extradata = av_packet_get_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
                                         &extradata_size);
     if (extradata) {
-        ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
-        if (ret < 0)
-            goto fail;
+        if (!is_annexb(extradata, extradata_size) && extradata_size >= 7) {
+            ret = h264_extradata_to_annexb(ctx, extradata, extradata_size);
+            if (ret < 0)
+                goto fail;
+            av_packet_side_data_remove(in->side_data, &in->side_data_elems,
+                                       AV_PKT_DATA_NEW_EXTRADATA);
+            av_packet_add_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
+                                    ctx->par_out->extradata,
+                                    ctx->par_out->extradata_size);
+        }
     }
 
     /* nothing to filter */
-- 
2.49.0

_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

To unsubscribe, visit link above, or email
ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".

^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2025-04-25  2:41 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2025-04-24  3:38 [FFmpeg-devel] [PATCH] avcodec/bsf/h264_mp4toannexb.c: change extradata to annexb if this is avcc jiangjie
2025-04-24  4:19 ` Zhao Zhili
2025-04-24  5:18   ` jie jiang
2025-04-24  6:41     ` Zhao Zhili
2025-04-24 12:42 ` jiangjie
2025-04-24 13:04   ` jie jiang
2025-04-24 14:03     ` Zhao Zhili
2025-04-24 14:20   ` Zhao Zhili
2025-04-24 14:53     ` jie jiang
2025-04-24 17:23       ` Zhao Zhili
2025-04-25  2:41         ` jie jiang

Git Inbox Mirror of the ffmpeg-devel mailing list - see https://ffmpeg.org/mailman/listinfo/ffmpeg-devel

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://master.gitmailbox.com/ffmpegdev/0 ffmpegdev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 ffmpegdev ffmpegdev/ https://master.gitmailbox.com/ffmpegdev \
		ffmpegdev@gitmailbox.com
	public-inbox-index ffmpegdev

Example config snippet for mirrors.


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git