[FFmpeg-devel] [PATCH] ffmpeg.c: Fallback to duration_dts, when duration_pts can't be determined.

[wm4]

On Tue, 10 Oct 2017 10:36:58 -0700
Sasi Inguva <isasi-at-google.com at ffmpeg.org> wrote:

> This is required for FLV files, for which duration_pts comes out to be zero.
> 
> Signed-off-by: Sasi Inguva <isasi at google.com>
> ---
>  fftools/ffmpeg.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
> index 6d64bc1043..3ee31473dc 100644
> --- a/fftools/ffmpeg.c
> +++ b/fftools/ffmpeg.c
> @@ -2665,8 +2665,13 @@ static int process_input_packet(InputStream *ist, const AVPacket *pkt, int no_eo
>                      ist->next_dts = AV_NOPTS_VALUE;
>              }
>  
> -            if (got_output)
> -                ist->next_pts += av_rescale_q(duration_pts, ist->st->time_base, AV_TIME_BASE_Q);
> +            if (got_output) {
> +                if (duration_pts > 0) {
> +                    ist->next_pts += av_rescale_q(duration_pts, ist->st->time_base, AV_TIME_BASE_Q);
> +                } else {
> +                    ist->next_pts += duration_dts;
> +                }
> +            }
>              break;
>          case AVMEDIA_TYPE_SUBTITLE:
>              if (repeating)

So why can't duration_pts be 0?