[FFmpeg-trac] #11531(ffmpeg:new): Audio stream not muxed with -c:a copy from RTSP

[FFmpeg]

#11531: Audio stream not muxed with -c:a copy from RTSP
------------------------------------+----------------------------------
             Reporter:  HelFix      |                     Type:  defect
               Status:  new         |                 Priority:  normal
            Component:  ffmpeg      |                  Version:  7.1
             Keywords:  AAC FFmpeg  |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
------------------------------------+----------------------------------
 Summary of the bug:
 -How to reproduce:
 - Use the following command with an RTSP stream:
 {{{
 ffmpeg -rtsp_transport tcp -i
 rtsp://admin:admin@10.15.129.19:554/Streaming/Channels/102 -c:v copy -c:a
 copy output.mp4
 }}}
 - Test with:
 ffmpeg-n7.1-39-g64e2864cb9-linux64-gpl-7.1 or 6.1.1 (works).
 ffmpeg-n7.1-62-gb168ed9b14-linux64-gpl-7.1 and newer (fails).

 - Expected Behavior:
 Both video and audio streams are muxed into output.mp4. In n7.1-39,
 ffprobe shows:
 Video: h264, 1920x536, ~20 fps.
 Audio: aac, 32000 Hz, mono.

 - Actual Behavior:
 In n7.1-62:
 Video is muxed (e.g., 219 packets, 2116297 bytes).
 Audio is read (e.g., 366 packets, 39746 bytes) but not muxed (0 packets, 0
 bytes).
 Example log from a similar 7.1 failure:

 {{{
 [in#0/rtsp] Input stream #0:1 (audio): 366 packets read (39746 bytes);
 [out#0/mp4] Output stream #0:1 (audio): 0 packets muxed (0 bytes);
 }}}

 {{{
 [rtsp @ 0x6044978bfbc0] SDP:
 v=0
 o=- 1743073449707371 1743073449707371 IN IP4 10.15.129.19
 s=Media Presentation
 e=NONE
 b=AS:5100
 t=0 0
 a=control:rtsp://10.15.129.19:554/Streaming/Channels/102/
 m=video 0 RTP/AVP 96
 c=IN IP4 0.0.0.0
 b=AS:5000
 a=recvonly
 a=x-dimensions:1920,536
 a=control:rtsp://10.15.129.19:554/Streaming/Channels/102/trackID=1
 a=rtpmap:96 H264/90000
 a=fmtp:96 profile-level-id=420029; packetization-mode=1; sprop-parameter-
 sets=Z0IAM4qKUDwCK8v/gACAALZAAAD6AAATiAE=,aM48gA==
 m=audio 0 RTP/AVP 104
 c=IN IP4 0.0.0.0
 b=AS:50
 a=recvonly
 a=control:rtsp://10.15.129.19:554/Streaming/Channels/102/trackID=2
 a=rtpmap:104 mpeg4-generic/32000/1
 a=fmtp:104 profile-level-id=15; streamtype=5; mode=AAC-hbr;
 config=1288;SizeLength=13; IndexLength=3; IndexDeltaLength=3; Profile=1;
 a=Media_header:MEDIAINFO=494D4B48010300000400000101200110007D0000007D000000000000000000000000000000000000;
 a=appversion:1.0
 }}}

 - Environment:
 OS: Ubuntu 24.04
 Builds: BtbN static Linux 64-bit GPL from https://github.com/BtbN/FFmpeg-
 Builds.

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11531>
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