diff options
| -rw-r--r-- | DOCS/man/options.rst | 10 | ||||
| -rw-r--r-- | demux/demux_raw.c | 4 |
2 files changed, 13 insertions, 1 deletions
diff --git a/DOCS/man/options.rst b/DOCS/man/options.rst index f49b5f4f46..6aa3466d0d 100644 --- a/DOCS/man/options.rst +++ b/DOCS/man/options.rst @@ -479,6 +479,16 @@ Playback Control framestep commands are transposed. Backstepping will perform very expensive work to step forward by 1 frame. + - Backward playback in wav files does not work properly (and possibly + similar formats, typically raw audio formats used through libavformat). + This is because libavformat does not align seeks on the packet sizes it + uses. (The packet sizes are arbitrary and chosen by libavformat + internally. Seeks on the other hand are sample-exact, which leads to + overlapping packets if the backward playback state machine seeks back. + This is very complex to work around, so it doesn't attempt to.) + A workaround is to remux to a format like mkv, which enforces packet + boundaries. Making mpv cache the entire file in memory also works. + Tuning: - Remove all ``--vf``/``--af`` filters you have set. Disable deinterlacing. diff --git a/demux/demux_raw.c b/demux/demux_raw.c index 2b47ebfedf..7469d80c5e 100644 --- a/demux/demux_raw.c +++ b/demux/demux_raw.c @@ -301,7 +301,9 @@ static void raw_seek(demuxer_t *demuxer, double seek_pts, int flags) stream_t *s = demuxer->stream; int64_t end = 0; stream_control(s, STREAM_CTRL_GET_SIZE, &end); - int64_t pos = seek_pts * p->frame_rate * p->frame_size; + int64_t frame_nr = seek_pts * p->frame_rate; + frame_nr = frame_nr - (frame_nr % p->read_frames); + int64_t pos = frame_nr * p->frame_size; if (flags & SEEK_FACTOR) pos = end * seek_pts; if (pos < 0) |