On 2/2/2015 9:04 AM, Anatol wrote:
Your cmd-line forces only one kf at "00:00:02.333".
You should either explicitly write down ALL kf's that u want -
"2,4,6,8,...3600",
or use an equation - 'expr:gte(t,n_forced*2)', this one for 2 sec gop
how can keyframes be inserted if he '-vcodec copy'?
On Mon, Feb 2, 2015 at 8:14 AM, Jean-Georges Fritsch <
[email protected]> wrote:
Hello I have been trying to use ffmpeg (version 2.5.3) to insert key frame
in am H.264/mpeg transport stream. But no key frame gets inserted.
Here is the command line:ffmpeg -i input.ts -force_key_frames:v 70
-acodec copy -vcodec copy -async 1 -y output.tsor
ffmpeg -i input.ts -force_key_frames:v 00:00:02.333 -acodec copy -vcodec
copy -async 1 -y output.ts
if you stream copy (-vcodec copy) your video stream, without
decoding/encoding process you can't change anything in the stream
configuration. you have to reencode in order to force keyframes.
for a more useful -force_key_frames usage than your example, Anatol gave
you already some examples.
Let me know what I am doing wrong. BTW I see the output stream contains
PAT/PMT before every frame. Is is the expected behavior?
Thx,
JGF
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