FFPlay set different pts from ffmpeg for AVFilterBufferRef
|Reported by:||chinshou||Owned by:||michael|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
Sorry I did not used the latest FFmpeg.
I found this problem with version 26383 get from ffmpeg on windows autobuild site.
ffplay set the pts for AVFilterBufferRef struct with output from guess_correct_pts function which is very small for example 67, 133 ,etc for the first several frames.
But ffmpeg will set the pts for AVFilterBufferRef with very large rescaled value which is calculated by output_packet function's function following process.
if(pkt->pts != AV_NOPTS_VALUE)
pkt_pts = av_rescale_q(pkt->pts, ist->st->time_base, AV_TIME_BASE_Q);
I added the log output code to vf_rotate's end_frame function like below.
static void end_frame(AVFilterLink *link)
RotContext? *rot = link->dst->priv;
AVFilterBufferRef *in = link->cur_buf;
AVFilterBufferRef *out = link->dst->outputs->out_buf;
int i, j, plane;
av_log(0, AV_LOG_ERROR, "rotate pts:%I64d\n", in->pts );
and used the command
ffmpeg -i 1.avi -vf "rotate" 2.avi
ffplay -vf "rotate" 1.avi
confirmed the problem