Quoting Andreas Unterweger (2015-01-25 12:32:58)
>  From 2afcf0d976dcba457fcfd8ec9b6fb67bc3161655 Mon Sep 17 00:00:00 2001
> From: Andreas Unterweger <[email protected]>
> Date: Sun, 25 Jan 2015 12:29:05 +0100
> Subject: [PATCH 3/3] Generate proper PTS for the muxer and set the container
>   time base to get rid of the newly introduced warning when only the
>   container's codec time base is set
> 
> ---
>   doc/examples/transcode_aac.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/doc/examples/transcode_aac.c b/doc/examples/transcode_aac.c
> index 3bc2f69..c7ed05c 100644
> --- a/doc/examples/transcode_aac.c
> +++ b/doc/examples/transcode_aac.c
> @@ -184,6 +184,10 @@ static int open_output_file(const char *filename,
>       /** Allow the use of the experimental AAC encoder */
>       (*output_codec_context)->strict_std_compliance = 
> FF_COMPLIANCE_EXPERIMENTAL;
>   
> +    /** Set the sample rate for the container */
> +    stream->time_base.den = input_codec_context->sample_rate;
> +    stream->time_base.num = 1;
> +
>       /**
>        * Some container formats (like MP4) require global headers to be 
> present
>        * Mark the encoder so that it behaves accordingly.
> @@ -565,6 +569,13 @@ static int encode_audio_frame(AVFrame *frame,
>       int error;
>       init_packet(&output_packet);
>   
> +    /** Set an artificial timestamp for the container later */
> +    static long pts = 0;

The proper type here is int64_t.

Also, since unfortunately many people copypaste from examples verbatim
without reading/understanding what they are doing, they might also take
this static variable, thus introducing "hidden" global state into their
programs. Perhaps it'd be better to make it explicitly global.

-- 
Anton Khirnov
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