[Peter Belkner]
> I was testing with Winamp and the FFmpeg based "in_ffsox" input plugin.
> It was not "stuttering" at all. I discovered "stuttering" only when
> testing with VLC player.
Aha.
> Meanwhile I've learned that we have two issues:
>
> 1. "20030213-cvs.mpeg" had not processed at all (i.e. just loudness
> analysis was aborting with an error and hence it could not have
> "stuttered")
> 2. "DavidGallo_2007.dv" stutters.
Aha. That is strange, as I am quite sure I tested it before reporting
the bug. Anyway, I trust your observations and must remember
incorrectly.
> The (previous) patch solves the first issue. The idea is to throw away
> packages FFmpeg cannot deal with.
Given that it only happen once, I guess the package is at the start or
at the end. Perhaps the message should be extended to mention how far
into the stream the package is dropped.
Am I right in believing that many such dropped packages in the middle of
the stream will cause audio and video to get out of sync?
> The following patch solves "stuttering" (but really is some kind of a
> "sledgehammer")
>
> diff -rc ./bs1770gain-0.4.4-beta2/libffsox-2/ffsox_frame_writer.c
> ./bs1770gain-0.4.4-beta3/libffsox-2/ffsox_frame_writer.c
> *** ./bs1770gain-0.4.4-beta2/libffsox-2/ffsox_frame_writer.c
> 2015-06-14 18:11:19.000000000 +0200
> --- ./bs1770gain-0.4.4-beta3/libffsox-2/ffsox_frame_writer.c
> 2015-06-22 09:12:36.000000000 +0200
> ***************
> *** 145,150 ****
> --- 145,154 ----
>
> if (0!=*got_packet) {
> av_packet_rescale_ts(pkt,cc->time_base,st->time_base);
> + // where do the "magic" factor 0.5 come from?
> + pkt->dts>>=1;
> + pkt->pts>>=1;
> + pkt->duration>>=1;
>
> if (ffsox_stream_interleaved_write(so,pkt)<0) {
> DMESSAGE("writing packet");
>
> Maybe Carl Eugen can provide some insight into how to align the time
> scales between streams.
I tested and this solve the stuttering for me too, but I have no idea
about the mathematics involved here.
--
Happy hacking
Petter Reinholdtsen
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