Video to Gif Error

[jay123210599]

Whenever I use ffmpeg to try to convert a yuv420p video to gif, I get this:

[swscaler @ 0000019797c785c0] [swscaler @ 00000197921477c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979215e7c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979216ef00] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979217f600] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979264be80] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792658e40] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792665e40] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792672e00] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792698500] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792d600c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792d6d080] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792dfbbc0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792e12f80] No accelerated colorspace conversion found from yuv420p to bgr8.

How do I fix this?

[Z2697]

Contribute to FFmpeg.

[jay123210599]

Originally Posted by Z2697

Contribute to FFmpeg.

I'm serious.

[huhn]

there is no information to work with...
you try to use hardware acceleration which the api can't do.

[Z2697]

Originally Posted by jay123210599

I'm serious.

I'm also serious.

[Z2697]

Originally Posted by huhn

there is no information to work with...
you try to use hardware acceleration which the api can't do.

If you mean GPU acceleration that's not actually the case here.
I didn't look into the specific piece of code which triggered this warning but I think what it actually means is instruction sets optimization / acceleration.
The warning is because the optimization / acceleration is not implemented.

[GeoffreyA]

Originally Posted by Z2697

If you mean GPU acceleration that's not actually the case here.
I didn't look into the specific piece of code which triggered this warning but I think what it actually means is instruction sets optimization / acceleration.
The warning is because the optimization / acceleration is not implemented.

Yes. Probably, it's just the plain C code, and that specific path hasn't got an SIMD version.

[GeoffreyA]

Originally Posted by jay123210599

Whenever I use ffmpeg to try to convert a yuv420p video to gif, I get this:

[swscaler @ 0000019797c785c0] [swscaler @ 00000197921477c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979215e7c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979216ef00] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979217f600] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 000001979264be80] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792658e40] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792665e40] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792672e00] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792698500] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792d600c0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792d6d080] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792dfbbc0] No accelerated colorspace conversion found from yuv420p to bgr8.
[swscaler @ 0000019797c785c0] [swscaler @ 0000019792e12f80] No accelerated colorspace conversion found from yuv420p to bgr8.

How do I fix this?

Is the result all right?

[jay123210599]

Here's the command I used:

ffmpeg -i yuv_video.mkv output.gif

Here's the information of my video:

Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High 4:4:4 Predictive@L4
Format settings                          : CABAC / 3 Ref Frames
Format settings, CABAC                   : Yes
Format settings, Reference frames        : 3 frames
Codec ID                                 : V_MPEG4/ISO/AVC
Duration                                 : 8 s 13 ms
Bit rate                                 : 92.5 Mb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 23.976 (23976/1000) FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 1.860
Stream size                              : 88.3 MiB (98%)
Writing library                          : x264 core 157 r2935M 545de2f
Encoding settings                        : cabac=1 / ref=3 / deblock=1:0:0 / analyse=0x1:0x111 / me=hex / subme=7 / psy=0 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=0 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc=cqp / mbtree=0 / qp=0
Default                                  : No
Forced                                   : No
Color range                              : Limited
Matrix coefficients                      : BT.709

[GeoffreyA]

Adding the accurate-rounding flags removes the warning.

-sws_flags accurate_rnd+full_chroma_int

As noted a couple of weeks ago, a palette can be used for better quality, but it takes more time.

https://forum.doom9.org/showthread.p...27#post2011227

ffmpeg -colorspace bt709 -i INPUT -vf palettegen -sws_flags accurate_rnd+full_chroma_int "palette.png"
ffmpeg -colorspace bt709 -i INPUT -i "palette.png" -lavfi paletteuse -sws_flags accurate_rnd+full_chroma_int "OUTPUT.gif"