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FLV: Update timestamp offset rule

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兼容用 SRT 协议推的的直播流
This commit is contained in:
genteure 2021-12-27 22:15:26 +08:00
parent 3fc90d4f57
commit 171d2e99b1
1 changed files with 13 additions and 1 deletions
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14
BililiveRecorder.Flv/Pipeline/Rules/UpdateTimestampOffsetRule.cs
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@ -9,6 +9,7 @@ namespace BililiveRecorder.Flv.Pipeline.Rules
{
public class UpdateTimestampOffsetRule : ISimpleProcessingRule
{
private const int MAX_ALLOWED_OFFSET_MS = 20;
private static readonly ProcessingComment comment1 = new ProcessingComment(CommentType.Unrepairable, "GOP 内音频或视频时间戳不连续");
private static readonly ProcessingComment comment2 = new ProcessingComment(CommentType.Unrepairable, "出现了无法计算偏移量的音视频偏移");
@ -98,7 +99,18 @@ namespace BililiveRecorder.Flv.Pipeline.Rules
ReduceOffsetRange(ref maxOffset, ref minOffset, lastAudio, null, tags);
if (minOffset == maxOffset)
if ((Math.Abs(minOffset) < MAX_ALLOWED_OFFSET_MS) && (Math.Abs(maxOffset) < MAX_ALLOWED_OFFSET_MS))
{
// 如果偏移范围在 20 ms 以内就忽略不管
// 主要是为了兼容 SRT 推流的直播流，好像会在 composition time 里补上，所以最终是正常的
// 理论上最正确的解决方法是带上 composition time 来计算应该怎么修改时间戳，但这样应该也行
// 根据观察偏移量为 16 - 17 ms
offset = 0;
goto validOffset;
}
else if (minOffset == maxOffset)
{ // 理想情况允许偏移范围只有一个值
offset = minOffset;
goto validOffset;