<p>Your source is neither YUV nor Y4M, going by the extension (and also the FFmpeg error you received). x265 is referring to a raw <strong>uncompressed</strong> bitstream by those extensions, not simply the pixel format. A <code>.h264</code> is a raw H.264-encoded bitstream.</p>

<p>To use ffmpeg only, start the cmd like this:</p>

<pre><code>ffmpeg -f h264 -i video.h264 -c:v libx265 ....
</code></pre>

<p>To use the x265 standalone encoder, use</p>

<pre><code>ffmpeg -f h264 -i video.h264 -f yuv4mpegpipe - | x265 --input - --fps 24 ....
</code></pre>

CC BY-SA 3.0
2017-02-23T05:44:05.257Z
2017-02-23T06:38:26.057Z
2017-02-23T06:38:26.057Z
Gyan
<p>I have some raw H.264 10bit videos need to convert to HEVC format, but the encoder only takes some frames (600/170000) to encode, and the video is full of noise. What is the correct way to encode those videos?</p>

<p>The command I used: </p>

<pre><code>x265 --input video.h264 --fps 24 --input-res 1920x1080 --output video.hevc
</code></pre>

<p>EDIT #1: I just tried to use ffmpeg but give me following error</p>

<blockquote>
  <p>Truncating packet of size 24883200 to 538208<br>
  [rawvideo @ 0x1561e80] Invalid buffer size, packet size 538207 &lt; expected frame_size 24883200
  Error while decoding stream #0:0: Invalid argument</p>
</blockquote>

<p>EDIT #2: ffmpeg cmd</p>

<pre><code> ffmpeg -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt yuv420p10le -i video.h264 -c:v libx265 -crf 18 -preset medium -x265-params profile=main10:level-idc=50:high-tier:vbv-bufsize=100000:vbv-maxrate=100000 video.hevc
</code></pre>

CC BY-SA 3.0
2017-02-22T10:51:53.797Z
What's your ffmpeg cmd? Note that for x265, `infile can be YUV or Y4M`
Gyan
CC BY-SA 3.0
2017-02-22T23:34:01.240Z
@Mulvya I updated the post with the ffmpeg cmd. In x265 part, my source is YUV but I don't know how to convert it to Y4M.
Hartman
<encoding><h.265>
How to encode with x265 cli
Hartman
# How to encode with x265 cli

(Asked by: username_0 on 2017-02-22)

I have some raw H.264 10bit videos need to convert to HEVC format, but the encoder only takes some frames (600/170000) to encode, and the video is full of noise. What is the correct way to encode those videos?
The command I used: 
x265 --input video.h264 --fps 24 --input-res 1920x1080 --output video.hevc

EDIT #1: I just tried to use ffmpeg but give me following error

Truncating packet of size 24883200 to 538208
  [rawvideo @ 0x1561e80] Invalid buffer size, packet size 538207 < expected frame_size 24883200
  Error while decoding stream #0:0: Invalid argument

EDIT #2: ffmpeg cmd
 ffmpeg -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt yuv420p10le -i video.h264 -c:v libx265 -crf 18 -preset medium -x265-params profile=main10:level-idc=50:high-tier:vbv-bufsize=100000:vbv-maxrate=100000 video.hevc

**Tags:** encoding, h.265

> **Comments:**
> **username_1**: What's your ffmpeg cmd? Note that for x265, `infile can be YUV or Y4M`  
> **username_0**: @Mulvya I updated the post with the ffmpeg cmd. In x265 part, my source is YUV but I don't know how to convert it to Y4M.  

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## 1 answers

### Answer by username_1 on 2017-02-23. Score: 2 | Accepted answer

Your source is neither YUV nor Y4M, going by the extension (and also the FFmpeg error you received). x265 is referring to a raw uncompressed bitstream by those extensions, not simply the pixel format. A .h264 is a raw H.264-encoded bitstream.
To use ffmpeg only, start the cmd like this:
ffmpeg -f h264 -i video.h264 -c:v libx265 ....

To use the x265 standalone encoder, use
ffmpeg -f h264 -i video.h264 -f yuv4mpegpipe - | x265 --input - --fps 24 ....


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