Set PTS and DTS in packets.
It accepts the following parameters:
- ts, pts, dts
-
Set expressions for PTS, DTS or both.
- duration
-
Set expression for duration.
- time_base
-
Set output time base.
- prescale
-
Set whether to convert time fields to user-set output time base before evaluation of expressions. Defaults to 0.
The expressions are evaluated through the eval API and can contain the following constants:
- N
-
The count of the input packet. Starting from 0.
- TS
-
The demux timestamp in input in case of
tsordtsoption or presentation timestamp in case ofptsoption. - POS
-
The original position in the file of the packet, or undefined if undefined for the current packet
- DTS
-
The demux timestamp in input.
- PTS
-
The presentation timestamp in input.
- DURATION
-
The duration in input.
- STARTDTS
-
The DTS of the first packet.
- STARTPTS
-
The PTS of the first packet.
- PREV_INDTS
-
The previous input DTS.
- PREV_INPTS
-
The previous input PTS.
- PREV_INDURATION
-
The previous input duration.
- PREV_OUTDTS
-
The previous output DTS.
- PREV_OUTPTS
-
The previous output PTS.
- PREV_OUTDURATION
-
The previous output duration.
- NEXT_DTS
-
The next input DTS.
- NEXT_PTS
-
The next input PTS.
- NEXT_DURATION
-
The next input duration.
- TB
-
The timebase in which time fields are denominated. The user-set output timebase if prescale is enabled, else the input timebase.
- TB_OUT
-
The output timebase.
- SR
-
The sample rate of stream packet belongs.
- NOPTS
-
The AV_NOPTS_VALUE constant.
For example, to set PTS equal to DTS (not recommended if B-frames are involved):
ffmpeg -i INPUT -c:a copy -bsf:a setts=pts=DTS out.mkv