[FFmpeg-devel] [PATCH v4] examples/decode_video: flush parser to fix missing frame

["zhilizhao(赵志立)"]

> On Apr 11, 2022, at 5:12 PM, zhilizhao(赵志立) <quinkblack at foxmail.com> wrote:
> 
> Ping. The same kind of issue like `doc/examples/transcode_aac: Don't ignore last encoded frame.
> 
> https://patchwork.ffmpeg.org/project/ffmpeg/patch/8fd28808-07f8-9458-b032-8792c67a38fd@gmail.com/

Will apply this weekend unless there are objections.

> 
>> On Jul 14, 2021, at 11:02 AM, Zhao Zhili <quinkblack at foxmail.com> wrote:
>> 
>> ---
>> v4: break when error occured in fread, fix infinite loop introduced by v3
>> v3: check EOF by "eof = !data_size && feof(f);"
>> 
>> doc/examples/decode_video.c | 12 ++++++++----
>> 1 file changed, 8 insertions(+), 4 deletions(-)
>> 
>> diff --git a/doc/examples/decode_video.c b/doc/examples/decode_video.c
>> index 18ee90a6c0..7238e38103 100644
>> --- a/doc/examples/decode_video.c
>> +++ b/doc/examples/decode_video.c
>> @@ -92,6 +92,7 @@ int main(int argc, char **argv)
>>    uint8_t *data;
>>    size_t   data_size;
>>    int ret;
>> +    int eof;
>>    AVPacket *pkt;
>> 
>>    if (argc <= 2) {
>> @@ -150,15 +151,16 @@ int main(int argc, char **argv)
>>        exit(1);
>>    }
>> 
>> -    while (!feof(f)) {
>> +    do {
>>        /* read raw data from the input file */
>>        data_size = fread(inbuf, 1, INBUF_SIZE, f);
>> -        if (!data_size)
>> +        if (ferror(f))
>>            break;
>> +        eof = !data_size;
>> 
>>        /* use the parser to split the data into frames */
>>        data = inbuf;
>> -        while (data_size > 0) {
>> +        while (data_size > 0 || eof) {
>>            ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size,
>>                                   data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
>>            if (ret < 0) {
>> @@ -170,8 +172,10 @@ int main(int argc, char **argv)
>> 
>>            if (pkt->size)
>>                decode(c, frame, pkt, outfilename);
>> +            else if (eof)
>> +                break;
>>        }
>> -    }
>> +    } while (!eof);
>> 
>>    /* flush the decoder */
>>    decode(c, frame, NULL, outfilename);
>> -- 
>> 2.31.1
>> 
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> 
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