NAL unit type 26, 27 not yet supported

Abhinav Agrawal aagrawal at
Sun Aug 30 16:58:18 UTC 2020

Sorry friends,

Just realized that I attached a wrong log file here. No idea how to remove
But my issue is similar to this one -

Just wanted to check if any fixes are already provided for this ?
Also, is it possible to just ignore the buffers with NAL 26/27 without any
harm and change the error message on bus to info or something non

Any help would be highly appreciated.


On Mon, Jul 27, 2020 at 12:49 AM Abhinav Agrawal <aagrawal at>

> Hi,
> I am trying to create mp4 video file from pcap file having capture of RTP
> Stream (RTP + RTCP muxed to single port) using following pipeline:
> `gst-launch-1.0 -e filesrc location=file1-h264-converted.pcap ! pcapparse
> name=pcap !
> "application/x-rtp,media=(string)video,clock-rate=(int)90000,encoding-name=(string)H264"
> ! rtpbin name=rtpbin ! rtph264depay ! h264parse ! "video/x-h264" ! mp4mux !
> filesink async=False location=out.mp4`
> However, I am getting following errors: (Full log attached)
> NAL unit type 26 not supported yet
> ERROR: from element /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0:
> The stream is in the wrong format.
> Additional debug info:
> Undefined packet type
> WARNING: from element
> /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0: Could not decode
> stream.
> Additional debug info:
> ../gst-plugins-good/gst/rtp/gstrtph264depay.c(1288):
> gst_rtp_h264_depay_process ():
> /GstPipeline:pipeline0/GstRtpH264Depay:rtph264depay0
> Just wanted to check if there is an issue in the pipeline? I checked the
> same pipeline with two different sources of H264 RTP streams and I am
> hitting the same issue with two different sources of H264, so I am
> suspecting the issue is with my pipeline rather than the stream itself. Any
> help is highly appreciated.
> Regards
> Abhinav
>  logs.tar.gz
> <>
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