> On Dec 27, 2021, at 2:38 PM, zhilizhao(赵志立) <[email protected]> wrote:
>
>> On Dec 27, 2021, at 1:57 PM, Gyan Doshi <[email protected]> wrote:
>>
>> As per ISO 14496-12, sample duration of 0 is invalid except for
>> the last entry.
>>
>> In addition, also catch 0 value for sample count.
>> ---
>> libavformat/mov.c | 12 ++++++++++++
>> 1 file changed, 12 insertions(+)
>>
>> diff --git a/libavformat/mov.c b/libavformat/mov.c
>> index 2aed6e80ef..fb7406cdd6 100644
>> --- a/libavformat/mov.c
>> +++ b/libavformat/mov.c
>> @@ -2968,6 +2968,18 @@ static int mov_read_stts(MOVContext *c, AVIOContext
>> *pb, MOVAtom atom)
>> av_log(c->fc, AV_LOG_TRACE, "sample_count=%d, sample_duration=%d\n",
>> sample_count, sample_duration);
>>
>> + if (!sample_count) {
>> + av_log(c->fc, AV_LOG_WARNING, "invalid sample count of 0 in stts
>> for st %d at entry %u; changing to 1.\n",
>> + c->fc->nb_streams-1, i);
>
> No, zero is a valid value, for example, fragmented mp4.
Ok, it’s sample_count, not entry_count.
>
>> + sc->stts_data[i].count = sample_count = 1;
>> + }
>> +
>> + if (!sample_duration && i != entries-1) {
>> + av_log(c->fc, AV_LOG_WARNING, "invalid sample delta of 0 in stts
>> for st %d at entry %u; changing to 1.\n",
>> + c->fc->nb_streams-1, i);
>> + sc->stts_data[i].duration = sample_duration = 1;
>> + }
>> +
>> duration+=(int64_t)sample_duration*(uint64_t)sample_count;
>> total_sample_count+=sample_count;
>> }
>> --
>> 2.33.0
>>
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