[FFmpeg-devel] [PATCH] avformat/hlsenc: Check ret on avformat_write_header

[Brendan McGrath]

On 26/01/18 14:30, 刘歧 wrote:
>
>> On 24 Jan 2018, at 09:24, Brendan McGrath <redmcg at redmandi.dyndns.org> wrote:
>>
>> Encoding currently fails when using hls_ts_options with the fmp4
>> segment type.
>>
>> This is due to the fact that avformat_write_header does not process
>> the passed options when the avformat is already initialized.
>>
>> When using fmp4, the hls_ts_options are parsed and the avformat
>> initialized within hls_mux_init.
>>
>> This patch checks the return of avformat_write_header so that if
>> it is greater than zero (indicating the avformat is already
>> initialized) then it does not error.
>>
>> Signed-off-by: Brendan McGrath <redmcg at redmandi.dyndns.org>
>> ---
>> I'm not sure if hls_ts_options is supposed to be used with fmp4 as the
>> description is currently:
>> hls_ts_options    <string>     E....... set hls mpegts list of options for the container format used for hls
>>
>> If it is (and the code within hls_mux_init seems to indicate that it is) - then this
>> patch fixes that (and the next will change the description - perhaps the option should
>> be renamed too?).
> maybe fmp4 need not use this option in short time.
I guess the options are:
a) Use 'hls_ts_options' for both mpegts and fmp4 (just change the 
description and ignore the fact the name isn't quite right);
b) Create a new option exclusively for fmp4 (say 'hls_fmp4_options' and 
change the code to use this for fmp4); or
c) Create a new option for both mpegts and fmp4 (say 
'hls_container_options' and deprecate 'hls_ts_options' - but allowing 
both for mpegts in the interim)

a) is he easiest to implement - but b) and c) are more user friendly. If 
there's a precedent - we should probably follow that.
>> I also considered checking if ret was < 0 and erroring immediately rather than relying
>> on av_dict_count. But I wasn't sure if that check had been intentionally left out
>> so the av_dict_free would take place.
>>
>> Let me know if the preference is for another if statement for ret < 0.
>>
>> libavformat/hlsenc.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
>> index 42e437f..d83d3b9 100644
>> --- a/libavformat/hlsenc.c
>> +++ b/libavformat/hlsenc.c
>> @@ -1878,7 +1878,7 @@ static int hls_write_header(AVFormatContext *s)
>>
>>          av_dict_copy(&options, hls->format_options, 0);
>>          ret = avformat_write_header(vs->avf, &options);
>> -        if (av_dict_count(options)) {
>> +        if (ret <= 0 && av_dict_count(options)) {
>>              av_log(s, AV_LOG_ERROR, "Some of provided format options in '%s' are not recognized\n", hls->format_options_str);
>>              ret = AVERROR(EINVAL);
>>              av_dict_free(&options);
>> -- 
>> 2.7.4
>>
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>
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