[FFmpeg-devel] [PATCH 1/2] avformat/movenc: Add movie_timescale option to AVIF

["zhilizhao(赵志立)"]

> On Jan 5, 2023, at 06:16, Vignesh Venkatasubramanian <vigneshv-at-google.com at ffmpeg.org> wrote:
> 
> Allow specifying the movie_timescale options to AVIF ouptut.
> 
> This also makes sure that when movie_timescale is not specified,
> the default value of 1000 is used instead of 0. Animated AVIF
> files which don't specify the movie_timescale will have the
> correct duration written in the track and movie headers after this
> change (instead of writing 0).
> 
> Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
> ---
> libavformat/movenc.c | 6 ++++++
> 1 file changed, 6 insertions(+)
> 
> diff --git a/libavformat/movenc.c b/libavformat/movenc.c
> index 7d49892283..36c76f7f60 100644
> --- a/libavformat/movenc.c
> +++ b/libavformat/movenc.c
> @@ -7758,6 +7758,11 @@ static const AVCodecTag codec_f4v_tags[] = {
> };
> 
> #if CONFIG_AVIF_MUXER
> +
> +static const AVOption avif_options[] = {
> +    { "movie_timescale", "set movie timescale", offsetof(MOVMuxContext, movie_timescale), AV_OPT_TYPE_INT, {.i64 = MOV_TIMESCALE}, 1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
> +    { NULL },
> +};

If there is a chance to add more options which is shared with
mov_isobmff_muxer_class, define a common option to avoid
duplication. Otherwise keep it as this.

> static const AVCodecTag codec_avif_tags[] = {
>     { AV_CODEC_ID_AV1,     MKTAG('a','v','0','1') },
>     { AV_CODEC_ID_NONE, 0 },
> @@ -7767,6 +7772,7 @@ static const AVCodecTag *const codec_avif_tags_list[] = { codec_avif_tags, NULL
> static const AVClass mov_avif_muxer_class = {
>     .class_name = "avif muxer",
>     .item_name  = av_default_item_name,
> +    .option     = avif_options,
>     .version    = LIBAVUTIL_VERSION_INT,
> };
> #endif
> -- 
> 2.39.0.314.g84b9a713c41-goog
> 
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