Hi,
the command of 'ffmpeg -h encoder=libx265' print the following message:
Encoder libx265 [libx265 H.265 / HEVC]:
General capabilities: delay threads
Threading capabilities: auto
Supported pixel formats: yuv420p yuv422p yuv444p gbrp yuv420p10le
yuv422p10le yuv444p10le gbrp10le gray gray10le
libx265 AVOptions:
-crf <float> E..V..... set the x265 crf (from -1 to
FLT_MAX) (default -1)
-forced-idr <boolean> E..V..... if forcing keyframes, force them as
IDR frames (default false)
-preset <string> E..V..... set the x265 preset
-tune <string> E..V..... set the x265 tune parameter
-profile <string> E..V..... set the x265 profile
-x265-params <string> E..V..... set the x265 configuration using a
:-separated list of key=value parameters
I build x265 with bitdepth=10, but ffmpeg fails to do transcoding hevc 10bit
into hevc 8bit. Its error message is shown as below:
x265 [error]: main profile not supported, internal bit depth 10.
[libx265 @ 0x4a4dac0] Invalid or incompatible profile set: main.
[libx265 @ 0x4a4dac0] Possible profiles: main main10 mainstillpicture msp
main-intra main10-intra main444-8 main444-intra main444-stillpicture main422-10
main422-10-intra main444-10 main444-10-intra main12 main12-intra main422-12
main422-12-intra main444-12 main444-12-intra main444-16-intra
main444-16-stillpicture
Error initializing output stream 0:0 -- Error while opening encoder for output
stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
I read x265 source code, and find x265_param_apply_profile() will check profile
and bitdepth:
/* Check if profile bit-depth requirement is exceeded by internal bit depth
*/
bool bInvalidDepth = false;
#if X265_DEPTH > 8
if (!strcmp(profile, "main") || !strcmp(profile, "mainstillpicture") ||
!strcmp(profile, "msp") ||
!strcmp(profile, "main444-8") || !strcmp(profile, "main-intra") ||
!strcmp(profile, "main444-intra") || !strcmp(profile,
"main444-stillpicture"))
bInvalidDepth = true;
#endif
#if X265_DEPTH > 10
if (!strcmp(profile, "main10") || !strcmp(profile, "main422-10") ||
!strcmp(profile, "main444-10") ||
!strcmp(profile, "main10-intra") || !strcmp(profile,
"main422-10-intra") || !strcmp(profile, "main444-10-intra"))
bInvalidDepth = true;
#endif
#if X265_DEPTH > 12
if (!strcmp(profile, "main12") || !strcmp(profile, "main422-12") ||
!strcmp(profile, "main444-12") ||
!strcmp(profile, "main12-intra") || !strcmp(profile,
"main422-12-intra") || !strcmp(profile, "main444-12-intra"))
bInvalidDepth = true;
#endif
if (bInvalidDepth)
{
x265_log(param, X265_LOG_ERROR, "%s profile not supported, internal bit
depth %d.\n", profile, X265_DEPTH);
return -1;
}
I think x265 with bitdepth=10 can be used to encode yuv420.
is that right?
Thanks!
Regards
Andrew
At 2019-05-09 18:57:15, "Dennis Mungai" <dmng...@gmail.com> wrote:
>On Thu, 9 May 2019 at 13:04, qw <applema...@163.com> wrote:
>
>> Hi,
>>
>>
>> If I build libx265 with bitdepth=10bit, and link it with ffmpeg, what's
>> command line to transcode video with libx265 8/10bit?
>>
>>
>Hmm, add either global option below:
>
>(a). -bits_per_raw_sample 10 and the encoder will pick both the profile and
>the appropriate pixel format for 10-bit encoding, or
>(b): -bits_per_raw_sample 8 and the encoder will pick both the profile and
>the appropriate pixel format for 8-bit encoding.
>
>Can you show us the output of ffmpeg -h encoder=libx265 ?
>
>According to https://ffmpeg.org/ffmpeg-codecs.html#libx265 you can also set
>profile restrictions via -profile:v , mapped in the encoder:
>https://x265.readthedocs.io/en/default/cli.html#profile-level-tier
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