user6298: I'm trying encode a video stream using HEVC with ffmpeg and create a MPEG-TS file. I need to be able to insert IDR frames to certain locations in the stream. I came across the flag -force_key_frames under ffmpeg documentation, but it doesn't seem to work for me. 
Here is the command I tried:
ffmpeg -s:v 1280x720 -i input.yuv -c:v libx265 -x265-params crf=20:keyint=25:fps=25:preset=ultrafast -force_key_frames 1,12,30,111 -f mpegts out.ts
Please help me to sort out this issue.
Thanks.

user9105: ffmpeg's libx265 wrapper is very minimal, and doesn't pass on very many settings.  e.g. -pass 1 requires manually setting -x265-params pass=1.
Also, if x265 is anything like x264, don't use ultrafast except for lossless or for testing things.
sorry for not taking the time to dig this up myself, but have a look and see if you can get your desired I frame locations into x265-params.  Probably not, though.
If you want to hack some C code, have a look at libx264.c and libx265.c, and maybe you can see how to ffmpeg sends frame-type requests to x264.  And maybe you can port that to the libx265 wrapper.

6298: <p>I'm trying encode a video stream using HEVC with ffmpeg and create a MPEG-TS file. I need to be able to insert IDR frames to certain locations in the stream. I came across the flag <code>-force_key_frames</code> under ffmpeg documentation, but it doesn't seem to work for me. </p>

<p>Here is the command I tried:</p>

<p><code>ffmpeg -s:v 1280x720 -i input.yuv -c:v libx265 -x265-params crf=20:keyint=25:fps=25:preset=ultrafast -force_key_frames 1,12,30,111 -f mpegts out.ts</code></p>

<p>Please help me to sort out this issue.</p>

<p>Thanks.</p>
 9105: <p>ffmpeg's <code>libx265</code> wrapper is very minimal, and doesn't pass on very many settings.  e.g. <code>-pass 1</code> requires manually setting <code>-x265-params pass=1</code>.</p>

<p>Also, if x265 is anything like x264, don't use ultrafast except for lossless or for testing things.</p>

<p>sorry for not taking the time to dig this up myself, but have a look and see if you can get your desired I frame locations into x265-params.  Probably not, though.</p>

<p>If you want to hack some C code, have a look at <code>libx264.c</code> and <code>libx265.c</code>, and maybe you can see how to ffmpeg sends frame-type requests to x264.  And maybe you can port that to the libx265 wrapper.</p>
