[FFmpeg-user] Use force_key_frames to obtain keyframes at exactly the same positions as in the input stream?

[Henk D. Schoneveld]

> On 02 May 2015, at 22:32, Anatol <anatol2002 at gmail.com> wrote:
> 
> Henk,
> Live streaming, not files.
OK, I was thinking with options as pause and go back in time, but you only intend linear streaming.
Sorry for the misunderstanding.
> 
> On Sat, May 2, 2015 at 10:32 PM, Henk D. Schoneveld <belcampo at zonnet.nl>
> wrote:
> 
>> 
>>> On 02 May 2015, at 21:11, Anatol <anatol2002 at gmail.com> wrote:
>>> 
>>> Henk,
>>> Its a real problem, if the streams are un-aligned, the playback gets into
>>> jump-forward-backward mood.
>> If you create a 5min source file and split in 5 1 minute chunks with the
>> help of the hls function of ffmpeg.
>> Then create 3 other quality streams form these chunks.
>> This results in a total of 4 hls compatible streams where switching
>> between each of them should be without any problem I think.
>>> It's not a problem to get source file key frames and to have them encoded
>>> into the rest of the files.
>>> The problem is with a live streaming, because it is not possible to query
>>> it for the keyframe lications
>>> 
>>> Reuben,
>>> The whole idea is to avoid intense CPU consumption for LIVE streaming.
>>> 
>>> 
>>> On Sat, May 2, 2015 at 8:31 PM, Reuben Martin <reuben.m at gmail.com>
>> wrote:
>>> 
>>>> On Saturday, May 02, 2015 06:00:32 PM Haris Zukanovic wrote:
>>>>> My case is live streaming.
>>>>> I have tried it and definitely keyframes are not aligned between input
>>>>> and output streams.
>>>>> For all encoded output streams it is very simple to obtain alignement
>>>>> with setting the fixed GOP size. But the PTS and keyframes of input are
>>>>> never aligned with that.
>>>>> 
>>>> 
>>>> I’ve had success with it as long as I encode all the derivative streams
>> at
>>>> once from the same encoder process. This of course can consume
>> significant
>>>> CPU
>>>> resources.
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>> 
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