[FFmpeg-devel] [PATCH 1/2] avformat/vividas: simplify, use av_rescale_q() instead
lance.lmwang at gmail.com
lance.lmwang at gmail.com
Sun May 3 16:20:46 EEST 2020
On Tue, Apr 28, 2020 at 11:49:16AM +0800, lance.lmwang at gmail.com wrote:
> From: Limin Wang <lance.lmwang at gmail.com>
>
> note it'll cause a small difference in accuracy for the pts, please see the testing result below:
> $ wget http://samples.ffmpeg.org/archive/all/unknown+unknown+unknown+unknown+5029_paramount_en_1250.viv
> $ ./ffmpeg -t 0.04 -i ./unknown+unknown+unknown+unknown+5029_paramount_en_1250.viv -f null -
> old:
> pts: 522
> pts: 1044
> pts: 1567
> pts: 3918
> pts: 8097
> pts: 12277
> pts: 16457
> ...
>
> new:
> pts: 522
> pts: 1045
> pts: 1567
> pts: 3918
> pts: 8098
> pts: 12278
> pts: 16457
> ...
>
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
> libavformat/vividas.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavformat/vividas.c b/libavformat/vividas.c
> index 4f54a4302e..b0f9f35ac2 100644
> --- a/libavformat/vividas.c
> +++ b/libavformat/vividas.c
> @@ -646,7 +646,7 @@ static int viv_read_packet(AVFormatContext *s,
> pkt->stream_index = 1;
> astream = s->streams[pkt->stream_index];
>
> - pkt->pts = av_rescale(viv->audio_sample, astream->time_base.den, astream->time_base.num) / astream->codecpar->sample_rate;
> + pkt->pts = av_rescale_q(viv->audio_sample, av_make_q(1, astream->codecpar->sample_rate), astream->time_base);
> viv->audio_sample += viv->audio_subpackets[viv->current_audio_subpacket].pcm_bytes / 2 / astream->codecpar->channels;
> pkt->flags |= AV_PKT_FLAG_KEY;
> viv->current_audio_subpacket++;
ping the patchset.
> --
> 2.21.0
>
--
Thanks,
Limin Wang
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