[FFmpeg-devel] [PATCH 2/2] avformat/img2enc: use unmatched filename for an invalid or missing sequence pattern

[Marton Balint]

On Mon, 13 Jun 2022, Marton Balint wrote:

> Also warn the user that for single images -update should be used, for sequences
> a proper pattern should be specified.
>
> Fixes ticket #9748.

Ping for this. Note that this patch will show a warning for any 
non-sequence image filename (unless the -update option is specified) 
in order to help the user avoid unexpected results with filenames 
containing %d.

Regards,
Marton

>
> Signed-off-by: Marton Balint <cus at passwd.hu>
> ---
> libavformat/img2enc.c | 18 +++++++++++-------
> 1 file changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
> index 82a04e639b..50e469dd96 100644
> --- a/libavformat/img2enc.c
> +++ b/libavformat/img2enc.c
> @@ -163,13 +163,17 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
>         }
>     } else if (av_get_frame_filename2(filename, sizeof(filename), s->url,
>                                       img->img_number,
> -                                      AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0 &&
> -               img->img_number > img->start_img_number) {
> -        av_log(s, AV_LOG_ERROR,
> -               "Could not get frame filename number %d from pattern '%s'. "
> -               "Use '-frames:v 1' for a single image, or '-update' option, or use a pattern such as %%03d within the filename.\n",
> -               img->img_number, s->url);
> -        return AVERROR(EINVAL);
> +                                      AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
> +        if (img->img_number == img->start_img_number) {
> +            av_log(s, AV_LOG_WARNING, "The specified filename '%s' does not contain an image sequence pattern or a pattern is invalid.\n", s->url);
> +            av_log(s, AV_LOG_WARNING,
> +                   "Use a pattern such as %%03d for an image sequence or "
> +                   "use the -update option (with -frames:v 1 if needed) to write a single image.\n");
> +            av_strlcpy(filename, s->url, sizeof(filename));
> +        } else {
> +            av_log(s, AV_LOG_ERROR, "Cannot write more than one file with the same name. Are you missing the -update option or a sequence pattern?\n");
> +            return AVERROR(EINVAL);
> +        }
>     }
>     for (i = 0; i < 4; i++) {
>         av_dict_copy(&options, img->protocol_opts, 0);
> -- 
> 2.34.1
>
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