Comments (5)
Wkkkkk
commented on June 11, 2024
Some outliners were found while testing.
For example, file bbb_1s.ts is parsed into
{"pid":256,"codec":"AVC","type":"video"}
{"pid":257,"codec":"AAC","type":"audio"}
{"pid":256,"parameterSet":"SPS","nr":0,"hex":"6764001facd9405005bb011000000300100000030300f1831960","length":26}
{"pid":256,"parameterSet":"PPS","nr":0,"hex":"68ebecb22c","length":5}
{"pid":256,"rai":true,"pts":133500,"dts":126000,"nalus":[{"type":"AUD_9","len":2},{"type":"SEI_6","len":701},{"type":"SPS_7","len":26},{"type":"PPS_8","len":5},{"type":"IDR_5","len":209}]}
{"pid":256,"rai":false,"pts":144750,"dts":129750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":34}]}
{"pid":256,"rai":false,"pts":137250,"dts":133500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":32}]}
{"pid":256,"rai":false,"pts":141000,"dts":137250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":32}]}
{"pid":256,"rai":false,"pts":148500,"dts":141000,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":48}]}
{"pid":256,"rai":false,"pts":152250,"dts":144750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":145}]}
{"pid":256,"rai":false,"pts":156000,"dts":148500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":204}]}
{"pid":256,"rai":false,"pts":163500,"dts":152250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":143}]}
{"pid":256,"rai":false,"pts":159750,"dts":156000,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":150}]}
{"pid":256,"rai":false,"pts":167250,"dts":159750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":315}]}
{"pid":256,"rai":false,"pts":171000,"dts":163500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":679}]}
{"SDT":[{"serviceId":1,"descriptors":[{"serviceName":"ts-info","providerName":"Eyevinn Technology"}]}]}
{"pid":256,"rai":false,"pts":174750,"dts":167250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":1718}]}
{"pid":256,"rai":false,"pts":182250,"dts":171000,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":918}]}
{"pid":256,"rai":false,"pts":178500,"dts":174750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":506}]}
{"pid":256,"rai":false,"pts":189750,"dts":178500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":1342}]}
{"pid":256,"rai":false,"pts":186000,"dts":182250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":704}]}
{"pid":256,"rai":false,"pts":201000,"dts":186000,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":6516}]}
{"pid":256,"rai":false,"pts":193500,"dts":189750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":1073}]}
{"pid":256,"rai":false,"pts":197250,"dts":193500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":1739}]}
{"pid":256,"rai":false,"pts":204750,"dts":197250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":12196}]}
{"pid":256,"rai":false,"pts":219750,"dts":201000,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":18657}]}
{"pid":256,"rai":false,"pts":212250,"dts":204750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":7371}]}
{"pid":256,"rai":false,"pts":208500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":3435}]}
{"pid":256,"rai":false,"pts":216000,"dts":212250,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":4061}]}
{"pid":256,"parameterSet":"SPS","nr":0,"hex":"6764001facd9405005bb011000000300100000030300f1831960","length":26}
{"pid":256,"parameterSet":"PPS","nr":0,"hex":"68ebecb22c","length":5}
{"pid":256,"rai":true,"pts":223500,"dts":216000,"nalus":[{"type":"AUD_9","len":2},{"type":"SPS_7","len":26},{"type":"PPS_8","len":5},{"type":"IDR_5","len":12975}]}
{"pid":256,"rai":false,"pts":234750,"dts":219750,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":24332}]}
{"streamType":"AVC","pid":256,"frameRate":23.04147465437788,"maxStep":7500,"minStep":3750,"avgStep":3906,"RAIGopDuration":1,"IDRGopDuration":1}Here we noticed that dts is missing in
{"pid":256,"rai":false,"pts":208500,"nalus":[{"type":"AUD_9","len":2},{"type":"NonIDR_1","len":3435}]}Since we are using dts to calculate frame rate, this outliner resulted in output "frameRate":23.04147465437788,"maxStep":7500,"minStep":3750
Similar outliners can be found in other ts files too.
from mp2ts-tools.
Wkkkkk
commented on June 11, 2024
It is important to handle PTS/DTS wrap-around by using right modulo operations. This must be included in tests (TODO).
from mp2ts-tools.
Wkkkkk
commented on June 11, 2024
An error field is added to statistics to indicate possible problems. Example messages are "PTS/DTS steps are not constant", or "Not enough PTS steps to calculate GOP duration".
To handle PTS/DTS wrap-arounds, we check for each timestamp step and pad it up if necessary.
This is done by checking if a step is lower than -MAXSTEP/2, if so, we add it by MAXSTEP. Here MAXSTEP = 2^33 - 1.
from mp2ts-tools.
Wkkkkk
commented on June 11, 2024
maxPic should be 0 by default (infinite loops).
from mp2ts-tools.
tobbee
commented on June 11, 2024
Some useful functions for TS difference calculations could be
const (
ptsWrap = 1 << 33
pcrWrap = ptsWrap * 300
)
func SignedPTSDiff(p2, p1 int64) int64 {
return (p2-p1+3*ptsWrap/2)%ptsWrap - ptsWrap/2
}
func UnsignedPTSDiff(p2, p1 int64) int64 {
return (p2 - p1 + 2*ptsWrap) % ptsWrap
}
func AddPTS(p1, p2 int64) int64 {
return (p1 + p2) % ptsWrap
}
func RewritePCR(p *packet.Packet, dtsOffset uint64) {
deltaPCR := dtsOffset * 300
pcrBytes, _ := adaptationfield.PCR(p)
pcr := gots.ExtractPCR(pcrBytes)
newPcr := (pcr + deltaPCR) % pcrWrap
gots.InsertPCR(pcrBytes, newPcr)
}
// GetPCRValue - return PCR value or -1 if absent
func GetPCRValue(p *packet.Packet) int64 {
if adaptationfield.HasPCR(p) {
pcrBytes, _ := adaptationfield.PCR(p)
pcr := gots.ExtractPCR(pcrBytes)
return int64(pcr)
}
return -1
}
// SignedPCRDiff - calculate signed diff pcr1 - pcr2 considering wrap-around
func SignedPCRDiff(pcr1 int64, pcr2 int64) int64 {
if pcr1-pcr2 < -pcrWrap/2 {
return pcr1 - pcr2 + pcrWrap
}
if pcr1-pcr2 > pcrWrap/2 {
return pcr1 - pcr2 - pcrWrap
}
return pcr1 - pcr2
}
func UnsignedPCRDiff(pcr1 int64, pcr2 int64) int64 {
if pcr1-pcr2 < 0 {
return pcr1 - pcr2 + pcrWrap
}
return pcr1 - pcr2
}from mp2ts-tools.
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