On 10/16/2016 9:30 PM, James Almer wrote:
> On 10/16/2016 5:11 PM, Andreas Cadhalpun wrote:
>> The problem was introduced in commit 1273bc6.
>>
>> Signed-off-by: Andreas Cadhalpun <andreas.cadhal...@googlemail.com>
>> ---
>> libavformat/matroskadec.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
>> index 8847c62..a5d3c0e 100644
>> --- a/libavformat/matroskadec.c
>> +++ b/libavformat/matroskadec.c
>> @@ -1759,7 +1759,7 @@ static int mkv_field_order(MatroskaDemuxContext
>> *matroska, int64_t field_order)
>>
>> /* workaround a bug in our Matroska muxer, introduced in version 57.36
>> alongside
>> * this function, and fixed in 57.52 */
>> - if (sscanf(matroska->muxingapp, "Lavf%d.%d.%d", &major, &minor, µ)
>> == 3)
>> + if (matroska->muxingapp && sscanf(matroska->muxingapp, "Lavf%d.%d.%d",
>> &major, &minor, µ) == 3)
>
> LGTM.
>
> Matroska files are supposed to always have that element, but even ffmpeg used
> to mux files without it at some point when bitexact flag was enabled, so i
> guess plenty of files out there are missing it.
>
>> bttb = (major == 57 && minor >= 36 && minor <= 51 && micro >= 100);
>>
>> switch (field_order) {
>>
Just tried a file missing the muxingapp element, meaning matroska->muxingapp
is NULL, and sscanf simply returns -1 and sets errno to EINVAL.
Where does it crash for you and using what file?
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