Re: [FFmpeg-devel] [PATCH] avformat/mpegts: initialize max_packet_size when sub-demuxer

[Marton Balint <cus@passwd.hu>]

On Sat, 5 Feb 2022, Gyan Doshi wrote:

> bca30570d2 added a user option to set max_packet_size replacing
> a hardcoded value. This had a side-effect of leaving the field
> set to 0 when packet demuxing is carried out from another demuxer
> using avpriv functions, which could lead to demux failure.
>
> Hardcoded max_packet_size inside avpriv_mpegts_parse_open to
> 2048000 to avoid this. Value chosen to be 10x that of default value
> to accommodate large payloads.

I don't understand why the default is different from the normal mpegts 
case. Large payloads can happen there as well, and previously it was 
assumed that splitting is OK, because it will be parsed anyway.

Regards,
Marton


> ---
> libavformat/mpegts.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
> index da15223b8a..e23f596490 100644
> --- a/libavformat/mpegts.c
> +++ b/libavformat/mpegts.c
> @@ -3377,6 +3377,7 @@ MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
>         return NULL;
>     /* no stream case, currently used by RTP */
>     ts->raw_packet_size = TS_PACKET_SIZE;
> +    ts->max_packet_size = 2048000;
>     ts->stream = s;
>     ts->auto_guess = 1;
>
> -- 
> 2.34.1
>
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