[FFmpeg-devel] [PATCH v6] avcodec/h264_slice: add warning log when droping picture at 'h264_select_output_frame'

[lance.lmwang at gmail.com]

On Thu, Dec 30, 2021 at 05:19:09PM +0800, zozobreak at 163.com wrote:
> This will lost the droped picture's infomation, lead to hard to debug when this error happens.

Please stop top posting.
As warning message, I think it's enough to print out "no picture ooo", if you want
to debug, please use gdb or add more debug message for yourself in you local branch. 

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> zozobreak at 163.com
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> From: lance.lmwang
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> Date: 2021-12-30 17:00
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> To: ffmpeg-devel
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> Subject: Re: [FFmpeg-devel] [PATCH v6] avcodec/h264_slice: add warning log when droping picture at 'h264_select_output_frame'
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> On Thu, Dec 30, 2021 at 03:24:28PM +0800, zourenyi wrote:
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> > since there is only debug log 'no picture ooo' when droping a picture,
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> > I spent much time to troubleshooting a wrong sps 'num_reorder_frames' param changed by webrtc's 'ParseAndRewriteSps',
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> > FFmpeg keeped silence about this error, so a warning log is much helpfull about this.
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> > Signed-off-by: zourenyi <zozobreak at 163.com>
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> > ---
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> >  libavcodec/h264_slice.c | 8 +++++++-
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> >  1 file changed, 7 insertions(+), 1 deletion(-)
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> > diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
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> > index c21004df97..f347d8ee1a 100644
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> > --- a/libavcodec/h264_slice.c
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> > +++ b/libavcodec/h264_slice.c
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> > @@ -1533,7 +1533,13 @@ static int h264_select_output_frame(H264Context *h)
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> >              }
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> >          }
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> >      } else {
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> > -        av_log(h->avctx, AV_LOG_DEBUG, "no picture %s\n", out_of_order ? "ooo" : "");
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> > +        if (out_of_order) {
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> > +            av_log(h->avctx, AV_LOG_WARNING,
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> > +                   "drop picture(%c, %d/%" PRId64 ") because out of order\n",
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> > +                   av_get_picture_type_char(out->f->pict_type), out->poc, out->f->pts);
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> > +        } else {
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> > +            av_log(h->avctx, AV_LOG_DEBUG, "no picture\n");
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> > +        }
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> >      }
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> I prefer to not change the old message, just use warning level for ooo, like below:
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> int loglevel = out_of_order ? AV_LOG_WARNING : AV_LOG_DEBUG;
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> av_log(h->avctx, loglevel,  "no picture %s\n", out_of_order ? "ooo" : "");
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> >      return 0;
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> > --
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> > 2.34.1
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> >
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> > _______________________________________________
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> --
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> Thanks,
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> 
> Limin Wang
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-- 
Thanks,
Limin Wang