[FFmpeg-devel] [FFmpeg-user] fMP4 generation speed

[Ronak]

> On Jul 25, 2018, at 11:42 PM, Liu Steven <lq at chinaffmpeg.org> wrote:
> 
> 
> 
>> 在 2018年7月26日，上午11:30，Ronak Patel <ronak2121 at yahoo.com> 写道：
>> 
>> 
>> 
>>> On Jul 25, 2018, at 11:25 PM, Ronak Patel <ronak2121-at-yahoo.com at ffmpeg.org> wrote:
>>> 
>>> 
>>> 
>>>> On Jul 25, 2018, at 11:12 PM, Liu Steven <lq at chinaffmpeg.org> wrote:
>>>> 
>>>> 
>>>> 
>>>>> 在 2018年7月26日，上午7:04，Ronak Patel <ronak2121-at-yahoo.com at ffmpeg.org> 写道：
>>>>> 
>>>>> Hi,
>>>>> 
>>>>> We’d like to start working on this real soon and want to make sure we properly fix this. We understand this code is used by more than just fMP4 assets and even live streaming use cases.
>>>>> 
>>>>> Can anyone please help shed some light on all use cases we should make sure are working after we make our fixes?
>>>>> 
>>>>> We’re afraid that the number of use cases here are unknown and we’ll be stuck fixing this for an unknown time.
>>>>> 
>>>>> Can anyone please shed some light on this?
>>>> 
>>>> you can try -f segment or -f hls or -f dash to do waht you want try, if all of them cannot suuport your feature, you can submmit patch here.
>>>> or you can submmit a new hls muxer patch here if you cannot fix all the parameters for the old hls muxer.
>>>> 
>> 
>> Ok I’m going to try to fix mpegts, live streams, fmp4 and the other options that you already have.
>> 
>> Are there any unit tests or other tests we can run to ensure everything is still working?
>> 
>> If not we will have to make sure it works manually.
> You can add fate for the current hls.
> 
> BTW, you can try hls_list_size 0 to make sure it can make the feature which you need.


I tried this, but it has no effect. So, here's what I'm thinking to solve this:

1. The HLS Manifest Header should be written in the hls_init method, not in the hls_window one.
2. Hls_window should only append a new segment definition to the end of the manifest file.
3. We can write out HLS_X_ENDLIST if we've reached the end of the file, or if the option says to attach it.

Would there be any reason why this algorithm wouldn't work to solve all possible use cases? We wouldn't have to keep regenerating the entire file just to append a new segment to the end of it.

Ronak