[FFmpeg-devel] [PATCH 1/3] avformat/avformat: Remove dead check, write-only assignment

[Andreas Rheinhardt]

Andreas Rheinhardt:
> For muxers, the internal AVCodecContext is basically unused
> except in avformat_transfer_internal_stream_timing_info()
> (which sets time_base and ticks_per_frame) and
> av_stream_get_codec_timebase() (a getter for time_base).
> This makes ticks_per_frame write-only, so don't set it.
> 
> Also remove an always-false check for the AVCodecContext's
> codec_tag.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>
> ---
>  libavformat/avformat.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/libavformat/avformat.c b/libavformat/avformat.c
> index 8e8c6fbe55..1a99598d6f 100644
> --- a/libavformat/avformat.c
> +++ b/libavformat/avformat.c
> @@ -775,11 +775,6 @@ int avformat_transfer_internal_stream_timing_info(const AVOutputFormat *ofmt,
>              || copy_tb == AVFMT_TBCF_R_FRAMERATE) {
>              enc_ctx->time_base.num = ist->r_frame_rate.den;
>              enc_ctx->time_base.den = 2*ist->r_frame_rate.num;
> -#if FF_API_TICKS_PER_FRAME
> -FF_DISABLE_DEPRECATION_WARNINGS
> -            enc_ctx->ticks_per_frame = 2;
> -FF_ENABLE_DEPRECATION_WARNINGS
> -#endif
>          } else
>  #endif
>              if (copy_tb == AVFMT_TBCF_AUTO && dec_ctx->framerate.num &&
> @@ -792,7 +787,6 @@ FF_ENABLE_DEPRECATION_WARNINGS
>  #if FF_API_TICKS_PER_FRAME
>  FF_DISABLE_DEPRECATION_WARNINGS
>              enc_ctx->time_base.num *= dec_ctx->ticks_per_frame;
> -            enc_ctx->ticks_per_frame = 2;
>  FF_ENABLE_DEPRECATION_WARNINGS
>  #endif
>          }
> @@ -812,7 +806,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
>          }
>      }
>  
> -    if ((enc_ctx->codec_tag == AV_RL32("tmcd") || ost->codecpar->codec_tag == AV_RL32("tmcd"))
> +    if (ost->codecpar->codec_tag == AV_RL32("tmcd")
>          && dec_ctx_tb.num < dec_ctx_tb.den
>          && dec_ctx_tb.num > 0
>          && 121LL*dec_ctx_tb.num > dec_ctx_tb.den) {

Will apply this patchset tomorrow unless there are objections.

- Andreas