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Set discontinuity_indicator to 1 for the first packet

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This commit is contained in:
Vanilagy
2026-01-16 16:56:50 +01:00
parent e8b27768a9
commit 282751ec1c
3 changed files with 21 additions and 14 deletions
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src/mpeg-ts/mpeg-ts-demuxer.ts
+4 -5
View File
@@ -638,10 +638,6 @@ const readPesPacketHeader = (section: Section): PesPacketHeader | null => {
bitstream.skipBits(14);
if (ptsDtsFlags !== 0b10 && ptsDtsFlags !== 0b11) {
return null; // Support only timestamped packets
}
let pts = 0;
if (ptsDtsFlags === 0b10 || ptsDtsFlags === 0b11) {
bitstream.skipBits(4);
@@ -651,7 +647,10 @@ const readPesPacketHeader = (section: Section): PesPacketHeader | null => {
bitstream.skipBits(1);
pts += bitstream.readBits(15);
} else {
return null; // Support only timestamped packets
throw new Error(
'PES packets without PTS are not currently supported. If you think this file should be supported,'
+ ' please report it.',
);
}
return {
src/mpeg-ts/mpeg-ts-muxer.ts
+15 -7
View File
@@ -52,6 +52,7 @@ type MpegTsTrackData = {
hevcDecoderConfig: HevcDecoderConfigurationRecord | null;
adtsHeader: Uint8Array | null;
adtsHeaderBitstream: Bitstream | null;
firstPacketWritten: boolean;
};
type QueuedPacket = {
@@ -128,6 +129,7 @@ export class MpegTsMuxer extends Muxer {
hevcDecoderConfig: null,
adtsHeader: null,
adtsHeaderBitstream: null,
firstPacketWritten: false,
};
this.trackDatas.push(newTrackData);
@@ -168,6 +170,7 @@ export class MpegTsMuxer extends Muxer {
hevcDecoderConfig: null,
adtsHeader: null,
adtsHeaderBitstream: null,
firstPacketWritten: false,
};
this.trackDatas.push(newTrackData);
@@ -518,18 +521,19 @@ export class MpegTsMuxer extends Muxer {
const totalLength = this.pesHeaderBuffer.length + queuedPacket.data.length;
let offset = 0;
let isFirst = true;
let isFirstTsPacket = true;
while (offset < totalLength) {
const pusi = isFirst;
const pusi = isFirstTsPacket;
const remainingData = totalLength - offset;
const needsRandomAccessIndicator = isFirst && queuedPacket.isKeyframe;
const randomAccessIndicator = isFirstTsPacket && queuedPacket.isKeyframe;
const discontinuityIndicator = isFirstTsPacket && !trackData.firstPacketWritten;
const basePaddingNeeded = Math.max(0, 184 - remainingData);
let adaptationFieldSize: number;
if (needsRandomAccessIndicator) {
// Random access indicator requires at least 2 bytes
if (randomAccessIndicator || discontinuityIndicator) {
// We need at least two bytes
adaptationFieldSize = Math.max(2, basePaddingNeeded);
} else {
adaptationFieldSize = basePaddingNeeded;
@@ -543,7 +547,9 @@ export class MpegTsMuxer extends Muxer {
buf[0] = 0; // adaptation_field_length
} else {
buf[0] = adaptationFieldSize - 1; // adaptation_field_length
buf[1] = Number(needsRandomAccessIndicator) << 6; // flags (random_access_indicator in bit 6)
buf[1]
= (Number(discontinuityIndicator) << 7) // discontinuity_indicator
| (Number(randomAccessIndicator) << 6); // random_access_indicator
buf.fill(0xFF, 2, adaptationFieldSize); // stuffing_bytes
}
@@ -569,8 +575,10 @@ export class MpegTsMuxer extends Muxer {
this.writeTsPacket(trackData.pid, pusi, adaptationField, payload);
offset += payloadSize;
isFirst = false;
isFirstTsPacket = false;
}
trackData.firstPacketWritten = true;
}
private writeTsPacket(