[FFmpeg-devel] [PATCH] asfenc: too many payloads in a packet

Michael Niedermayer michaelni at gmx.at
Tue May 13 01:05:54 CEST 2014

On Mon, May 12, 2014 at 03:26:11PM -0700, Aaron Graham wrote:
> In the ASF specification:
> http://www.microsoft.com/en-us/download/details.aspx?id=14995
> the section on Multiple payloads ( describes the bit fields used to
> specify payload length type and number of payloads. The number of payloads
> field is a 6-bit field, meaning a packet can hold a maximum of 63 payloads.
> asfenc.c was not honoring this, and if more than 63 payloads would fit in a
> packet, the "number of payloads" field would overflow into the "payload
> length type" field, causing parsing errors in ffplay.
> You can reproduce this with any AAC file that has several seconds of
> silence in the beginning (lots of very small AAC frames). Use this ffmpeg
> command:
> $ ffmpeg -i silence.m4a -acodec copy silence.asf
> Note that ffplay will get lots of errors.
> Anyway, here's a patch to fix the problem:

patch applied


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