[FFmpeg-user] Split video frame accurate respecting GOP's

[me at renecalles.de]

Thanks,

i know that from ffprobe but thought it's maybe also implemented in 
ffmpeg.

The critical part is to pass frame numbers to ffmpeg, as i understand 
frame accurate seeking is not possible in ffmpeg.

Or is there any workaround for that? Another solution could be an 
option in ffmpeg to split the video every n minutes, but without a 
script using the -ss and -t options.

Best,
René



On Tue, 25 Oct 2011 16:33:39 +0200, belcampo wrote:
> On 10/25/2011 03:48 PM, me at renecalles.de wrote:
>> Hi Deepika, belcampo,
>>
>> thank you both for your input.
>>
>> I'm thinking in some kind of more general solution.
>> The idea is to parse the video, looking for I-Frames in a defined 
>> interval and split directly before the I-Frame appears.
>> This could also solve the fixed / non-fixed GOP situation.
> Search:
> 
> http://www.google.nl/url?sa=t&rct=j&q=extract%20list%20of%20keyframes%20belcampo&source=web&cd=1&ved=0CBwQFjAA&url=http%3A%2F%2Fffmpeg-users.933282.n4.nabble.com%2FCreating-a-list-of-I-frames-td2299316.html&ei=bcimTojxDc30-gasnN2vCQ&usg=AFQjCNGE63wbQ4bx7TfpJT4fIH_aglfN5w&cad=rja
>>
>> The -ss and -t solution makes me feel a bit uncomfortable as it not 
>> really "under control".
>>
>> Regards,
>> René
>>
>>
>>
>> On Tue, 25 Oct 2011 12:49:55 +0200, belcampo wrote:
>>> On 10/25/2011 11:58 AM, Deepika wrote:
>>>> Hi rene,
>>>>
>>>> Please take a look at -ss and -t options to split the file. If you 
>>>> have fixed gops at regular intervals this should solve your problem.
>>>>
>>>> Regards,
>>>> Deepika
>>>> On 10/25/2011 05:04 PM, me at renecalles.de wrote:
>>>>> Hi there,
>>>>>
>>>>> i would like to split video streams frame accurate for separate 
>>>>> encoding on different machines.
>>>>>
>>>>> For that in my theory i need to split those files frame accurate 
>>>>> respecting the GOP's.
>>>>>
>>>>> Now my question is, is there any way to do it with ffmpeg or do i 
>>>>> have do stick with libav?
>>>>>
>>>>> Any hint is appreciated.
>>> Search for [issue2114] GOP-based multithreading(h264 encoding
>>> performance boost of 78%)
>>> I asked for this in june 2010. If your source is as mentioned above
>>> "you have fixed gops at regular intervals" as with DVB-S mpeg2 
>>> files
>>> which have GOPs of 12-frames it's easy. If it's h264, the 
>>> HD-channels
>>> it's more tedious. There is a solution, if you use 
>>> tsMuxeR/tsMuxerGUI
>>> you can split the source in parts, where tsMuxeR takes care of
>>> splitting at GOP-boundaries, each part starts with an I-frame.
>>> mkvtoolnix has the same ability.
>>>>>
>>>>> Thanks a lot.
>>>>>
>>>>> René
>>>>> _______________________________________________
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