Handle truncated PES packets by tmm1 · Pull Request #37 · asticode/go-astits

tmm1 · 2022-01-21T22:04:52Z

Simple fix for #35

Unfortunately this is breaking some tests which are creating and operating on malformed packets.

--- FAIL: TestParsePESData (0.00s)
    --- FAIL: TestParsePESData/with_header (0.00s)
        data_pes_test.go:407:
            	Error Trace:	data_pes_test.go:407
            	Error:      	Not equal:
            	            	expected: &astits.PESData{Data:[]uint8{0x64, 0x61, 0x74, 0x61}, Header:(*astits.PESHeader)(0x1381690)}
            	            	actual  : &astits.PESData{Data:[]uint8{0x64, 0x61, 0x74, 0x61, 0x73, 0x74, 0x75, 0x66, 0x66}, Header:(*astits.PESHeader)(0xc0000534a0)}

            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1,4 +1,4 @@
            	            	 (*astits.PESData)({
            	            	- Data: ([]uint8) (len=4) {
            	            	-  00000000  64 61 74 61                                       |data|
            	            	+ Data: ([]uint8) (len=9) {
            	            	+  00000000  64 61 74 61 73 74 75 66  66                       |datastuff|
            	            	  },
            	            	@@ -62,3 +62,3 @@
            	            	   }),
            	            	-  PacketLength: (uint16) 67,
            	            	+  PacketLength: (uint16) 9,
            	            	   StreamID: (uint8) 1
            	Test:       	TestParsePESData/with_header
--- FAIL: TestParseData (0.00s)
    data_test.go:47:
        	Error Trace:	data_test.go:47
        	Error:      	Not equal:
        	            	expected: []*astits.DemuxerData{(*astits.DemuxerData)(0xc000073770)}
        	            	actual  : []*astits.DemuxerData{(*astits.DemuxerData)(0xc000073720)}

        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -24,4 +24,4 @@
        	            	   PES: (*astits.PESData)({
        	            	-   Data: ([]uint8) (len=4) {
        	            	-    00000000  64 61 74 61                                       |data|
        	            	+   Data: ([]uint8) (len=9) {
        	            	+    00000000  64 61 74 61 73 74 75 66  66                       |datastuff|
        	            	    },
        	            	@@ -85,3 +85,3 @@
        	            	     }),
        	            	-    PacketLength: (uint16) 67,
        	            	+    PacketLength: (uint16) 9,
        	            	     StreamID: (uint8) 1
        	Test:       	TestParseData
FAIL
FAIL	github.com/asticode/go-astits	0.008s
FAIL

Specifically, the with_header PES test advertises a packet length of 67 even though it only has 9 bytes of data:

go-astits/data_pes_test.go

Lines 258 to 265 in 473f66c

    
           "with_header", 
        
           func(w *astikit.BitsWriter, withStuffing bool, withCRC bool) { 
        
           	packetLength := 67 
        
           	stuffing := []byte("stuff") 
        
           	if !withStuffing { 
        
           		packetLength -= len(stuffing) 
        
           	}

go-astits/data_pes_test.go

Lines 329 to 332 in 473f66c

    
           stuffing := []byte("stuff") 
        
           w.Write([]byte("data")) // Data 
        
           if withStuffing { 
        
           	w.Write(stuffing) // Stuffing

I tried to fix these tests but they make a lot of assumptions and reuse fixtures like pesWithHeaderBytes() which creates quite the rabbit hole.

tmm1 · 2022-01-21T22:07:33Z

Simple fix for #35

My first attempt was more complex: fancybits@a55f10a

That approach also works, but the same tests fail for the same reason.

coveralls · 2022-01-21T22:11:51Z

Coverage increased (+0.03%) to 77.24% when pulling b1ef54e on tmm1:truncated-pes-adjust into 473f66c on asticode:master.

asticode · 2022-01-23T10:24:22Z

Specifically, the with_header PES test advertises a packet length of 67 even though it only has 9 bytes of data

Are you sure this is an error? 🤔 packet length is supposed to indicate the number of bytes after this field, optional header included.

asticode · 2022-01-23T10:28:57Z

Regarding the content of the PR, I don't really like the idea of ignoring the problem and rewriting the packet length.

As you suggested here, I would implement the CorruptedPacketHandler logic and make the corrupted packet go through it.

eric · 2022-11-15T00:00:42Z

Fixed the issue with the tests not passing.

asticode · 2022-11-16T08:22:12Z

Fixed the issue with the tests not passing.

Thanks @eric, but as I mentioned in my previous comment, I'd rather go the CorruptedPacketHandler route in this case 👍

ayhangenc · 2023-06-07T12:36:50Z

Hi,

I'd like to share my case which might be related, I set up a muxer from a live stream into srt mpegts via astits.newmuxer and during muxing I have error messages both on go app and ffplay(receiver);
SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 185 bytes of payload: only 182 is available...
on app log and then
panic: runtime error: slice bounds out of range [1319:1316]
goroutine 12 [running]:
bufio.(*Writer).Write(0xc00029e100, {0xc0002801e1?, 0x10014c675?, 0x10014c675?}) /usr/local/go/src/bufio/bufio.go:670 +0x1c8
github.com/asticode/go-astikit.(*BitsWriter).write(0xc0002a42d0, {0xc0002801e1, 0x1, 0x1}) /Users/user/go/pkg/mod/github.com/asticode/go-astikit@v0.30.0/binary.go:142 +0x3d
on console...
also on ffplay;
[mpegts @ 0x7fae05714180] Packet corrupt (stream = 0, dts = 6652800).
[h264 @ 0x7fae06a3d280] concealing 2720 DC, 2720 AC, 2720 MV errors in P frame
[aac @ 0x7fae068416c0] channel element 0.5 is not allocated f=0/0

I just wonder how to overcome this? What would be CorruptPacketHandler case for muxer?

Thanks in advance

AyhG

asticode · 2023-06-13T07:08:55Z

@ayhangenc could you share the next 10 or 20 lines of the panic stack?

ayhangenc · 2023-06-13T08:33:47Z

Hi @asticode ,

here is the complete dump of the log screen for the app.
it'a a basic rtsp to srt gateway. test source is ffmpeg and the srt consumer is ffplay currently.
I have a lot of error messages on ffplay while video is frozen before panic. Panic is not instant though, it takes a while.
hope this helps..
thnak you.

the error message on ffplay is this:

...
[mpegts @ 0x7fbf19f16c00] changing packet size to 192    0B f=0/0   
[mpegts @ 0x7fbf19f16c00] changing packet size to 188    0B f=0/0   
[mpegts @ 0x7fbf19f16c00] changing packet size to 192    0B f=0/0   
[mpegts @ 0x7fbf19f16c00] changing packet size to 188    0B f=0/0   
[mpegts @ 0x7fbf19f16c00] changing packet size to 204    0B f=0/0   
[mpegts @ 0x7fbf19f16c00] changing packet size to 188    0B f=0/0   
1906.04 A-V:520.879 fd= 123 aq=    0KB vq=    0KB sq=    0B f=0/0   
...

and the app log:

% go run .
2023/06/13 10:39:55 loading config files from config folder ./config!...
2023/06/13 10:39:55 Running RTSP Client!... live2
2023/06/13 10:39:55 Running RTSP Client!... live1
2023/06/13 10:39:55 Socket  connected!... &{129186975 false 0xc000236090 127.0.0.1 5808 map[blocking:0 latency:250 mode:caller payloadsize:1316 streamid:CAM1 transtype:live] 2 1456 -1}
2023/06/13 10:39:55 Socket  connected!... &{129186974 false 0xc0002b0090 127.0.0.1 5809 map[blocking:0 latency:250 mode:caller payloadsize:1316 streamid:CAM2 transtype:live] 2 1456 -1}
2023/06/13 10:39:55 IDR Not Present Error: 
2023/06/13 10:39:55 Encoding video access units into muxer error: IDR Not Present Error... 
2023/06/13 10:39:55 IDR Not Present Error: 
2023/06/13 10:39:55 Encoding video access units into muxer error: IDR Not Present Error...
2023/06/13 10:39:55 IDR Not Present Error: 
2023/06/13 10:39:55 Encoding video access units into muxer error: IDR Not Present Error... 
...
2023/06/13 10:40:09 IDR Not Present Error: 
2023/06/13 10:40:09 Encoding video access units into muxer error: IDR Not Present Error...  
2023/06/13 10:40:09 IDR Not Present Error: 
2023/06/13 10:40:09 Encoding video access units into muxer error: IDR Not Present Error...  
2023/06/13 10:40:16 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 272 bytes of payload: only 182 is available...  
2023/06/13 10:40:16 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:40:16 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:40:16 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 293 bytes of payload: only 182 is available...  
2023/06/13 10:40:16 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:40:16 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:40:44 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 333 bytes of payload: only 182 is available...  
2023/06/13 10:40:44 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:40:44 Encoding audio access units into muxer error: SRT Send Error... 
2023/06/13 10:42:04 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 356 bytes of payload: only 184 is available...  
2023/06/13 10:42:04 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:42:04 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:42:14 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 187 bytes of payload: only 182 is available...  
2023/06/13 10:42:14 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:42:14 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:42:14 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 187 bytes of payload: only 182 is available...  
2023/06/13 10:42:14 SRT Audio ErrorChannel active... 1001
 
2023/06/13 10:42:14 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:43:08 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 183 bytes of payload: only 182 is available...  
2023/06/13 10:43:08 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:43:08 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:43:19 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 193 bytes of payload: only 182 is available...  
2023/06/13 10:43:19 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:43:19 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:43:45 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 143 bytes of payload: only 140 is available...  
2023/06/13 10:43:45 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:43:45 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:43:55 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 236 bytes of payload: only 184 is available...  
2023/06/13 10:43:55 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:43:55 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 350 bytes of payload: only 182 is available...  
2023/06/13 10:43:55 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:43:55 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:43:55 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:44:17 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 321 bytes of payload: only 184 is available...  
2023/06/13 10:44:17 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:44:17 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:44:34 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 310 bytes of payload: only 182 is available...  
2023/06/13 10:44:34 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:44:34 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:44:34 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 305 bytes of payload: only 182 is available...  
2023/06/13 10:44:34 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:44:34 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:44:39 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 197 bytes of payload: only 182 is available...  
2023/06/13 10:44:39 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:44:39 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:44:39 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 55 bytes of payload: only 30 is available...  
2023/06/13 10:44:39 SRT Audio ErrorChannel active... 1001
 
2023/06/13 10:44:39 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:44:39 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 258 bytes of payload: only 182 is available...  
2023/06/13 10:44:39 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:44:39 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:45:03 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 229 bytes of payload: only 184 is available...  
2023/06/13 10:45:03 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:45:03 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 343 bytes of payload: only 182 is available...  
2023/06/13 10:45:03 Encoding audio access units into muxer error: SRT Send Error...   
2023/06/13 10:45:03 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:45:03 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:45:13 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 245 bytes of payload: only 184 is available...  
2023/06/13 10:45:13 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:45:13 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:46:08 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 219 bytes of payload: only 184 is available...  
2023/06/13 10:46:08 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:46:08 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:46:23 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 213 bytes of payload: only 182 is available...  
2023/06/13 10:46:23 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:46:23 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:46:55 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 222 bytes of payload: only 182 is available...  
2023/06/13 10:46:55 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:46:55 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:46:55 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 142 bytes of payload: only 68 is available...  
2023/06/13 10:46:55 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:46:55 Encoding video access units into muxer error: SRT Send Error...  
2023/06/13 10:47:48 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 185 bytes of payload: only 184 is available...  
2023/06/13 10:47:48 SRT Audio ErrorChannel active... 1001
 
2023/06/13 10:47:48 Encoding audio access units into muxer error: SRT Send Error...  
2023/06/13 10:48:44 SRT MPEGTS muxer write SRT Video error: writePacket: can't write 156 bytes of payload: only 153 is available...  
2023/06/13 10:48:44 SRT Video ErrorChannel active...  127.0.0.1
2023/06/13 10:48:44 Encoding video access units into muxer error: SRT Send Error... 
2023/06/13 10:48:44 SRT MPEGTS muxer write SRT Audio error: writePacket: can't write 175 bytes of payload: only 22 is available...  
2023/06/13 10:48:44 SRT Audio ErrorChannel active... 1002
 
2023/06/13 10:48:44 Encoding audio access units into muxer error: SRT Send Error...  
panic: runtime error: slice bounds out of range [120:0]

goroutine 52 [running]:
bytes.(*Buffer).Write(0x3?, {0xc000280318?, 0xc00004a970?, 0x10039f53b?})
        /usr/local/go/src/bytes/buffer.go:172 +0xd6
github.com/asticode/go-astikit.(*BitsWriter).write(0xc000298320, {0xc000280318, 0x1, 0x1})
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astikit@v0.40.0/binary.go:142 +0x3d
github.com/asticode/go-astikit.(*BitsWriter).flushBsCache(...)
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astikit@v0.40.0/binary.go:169
github.com/asticode/go-astikit.(*BitsWriter).writeFullByte(0x0?, 0x20?)
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astikit@v0.40.0/binary.go:179 +0x7e
github.com/asticode/go-astikit.(*BitsWriter).writeByteSlice(0xc000298320, {0xc000599180, 0xa8, 0xc00004aaa0?})
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astikit@v0.40.0/binary.go:130 +0x89
github.com/asticode/go-astikit.(*BitsWriter).Write(0xc000298320?, {0x1003e5cc0?, 0xc00004aa50?})
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astikit@v0.40.0/binary.go:75 +0xa5
github.com/asticode/go-astits.writePESData(0x100405d00?, 0xc000282570?, {0xc000599180?, 0x1aa?, 0x1aa?}, 0x8?, 0xb6?)
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astits@v1.11.0/data_pes.go:465 +0xb3
github.com/asticode/go-astits.(*Muxer).WriteData(0xc0002846e0, 0xc00004acb8)
        /Users/anyuser/go/pkg/mod/github.com/asticode/go-astits@v1.11.0/muxer.go:230 +0x4dd
X.7/gateway.(*SRT).Encode(0xc0000e2580, {0xc0003c9aa0, 0x4, 0x10038d28a?}, {0x0?, 0x10005687f?, 0x10004e552?}, 0x7db35b0a00)
        /Users/anyuser/GolandProjects/X.7/gateway/srt.go:175 +0x10cd
X.7/gateway.(*Gateway).RunRTSP.func1(0xc000292140?)
        /Users/anyuser/GolandProjects/X.7/gateway/rtsp.go:127 +0x191
github.com/bluenviron/gortsplib/v3.(*clientFormat).readRTPUDP(0xc0002983c0, 0xc000282870?)
        /Users/anyuser/go/pkg/mod/github.com/bluenviron/gortsplib/v3@v3.7.0/client_format.go:117 +0x185
github.com/bluenviron/gortsplib/v3.(*clientMedia).readRTPUDPPlay(0xc000296480, {0xc000176000, 0xc00004af20?, 0x5c1})
        /Users/anyuser/go/pkg/mod/github.com/bluenviron/gortsplib/v3@v3.7.0/client_media.go:291 +0xae
github.com/bluenviron/gortsplib/v3.(*clientUDPListener).runReader(0xc0002b80e0)
        /Users/anyuser/go/pkg/mod/github.com/bluenviron/gortsplib/v3@v3.7.0/client_udp_listener.go:195 +0x1e5
created by github.com/bluenviron/gortsplib/v3.(*clientUDPListener).start
        /Users/anyuser/go/pkg/mod/github.com/bluenviron/gortsplib/v3@v3.7.0/client_udp_listener.go:153 +0xaa
exit status 2

asticode · 2023-06-13T08:44:52Z

Can you open an issue including test data which would allow us to reproduce the problem so that it could be traced more easily?

pes: read available PES data when truncated

b1ef54e

Add extra empty bytes to the buffer to make tests pass

8d2fa2e

asticode force-pushed the master branch 2 times, most recently from 106bbe5 to 0df190a Compare July 27, 2023 09:41

Merge remote-tracking branch 'upstream/master' into truncated-pes-adjust

9fc774d

asticode force-pushed the master branch 2 times, most recently from 66f3fa5 to 86767b5 Compare October 26, 2025 18:06

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Handle truncated PES packets#37

Handle truncated PES packets#37
tmm1 wants to merge 3 commits intoasticode:masterfrom
fancybits:truncated-pes-adjust

tmm1 commented Jan 21, 2022

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	"with_header",
	func(w *astikit.BitsWriter, withStuffing bool, withCRC bool) {
	packetLength := 67
	stuffing := []byte("stuff")

	if !withStuffing {
	packetLength -= len(stuffing)
	}

	stuffing := []byte("stuff")
	w.Write([]byte("data")) // Data
	if withStuffing {
	w.Write(stuffing) // Stuffing

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