Opened 5 years ago

Closed 5 years ago

#3242 closed defect (fixed)

libswscale incorrectly presents warning about "Deprecated pixel format"

Reported by: jnvsor Owned by:
Priority: minor Component: swscale
Version: git-master Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: yes
Analyzed by developer: no


libswscale incorrectly presents warning about "Deprecated pixel format" on padded rgb pixel formats

#ffmpeg-devel leads me to believe BGR0 isn't deprecated so this is a bug

sws_init_context gives a warning if c->srcFormat changes from the start of the function, before that if statement however it calls:
sws_setColorspaceDetails which calls
handle_formats which calls
handle_0alpha which changes the pixel formats and triggers the warning

av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
                             SwsFilter *dstFilter)

    if (!c->contrast && !c->saturation && !c->dstFormatBpp)
        sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,
                                 c->dstRange, 0, 1 << 16, 1 << 16);

    if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)
        av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],
                             int srcRange, const int table[4], int dstRange,
                             int brightness, int contrast, int saturation)
    const AVPixFmtDescriptor *desc_dst;
    const AVPixFmtDescriptor *desc_src;
    memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
    memmove(c->dstColorspaceTable, table, sizeof(int) * 4);


static void handle_formats(SwsContext *c)
    c->src0Alpha |= handle_0alpha(&c->srcFormat);
    c->dst0Alpha |= handle_0alpha(&c->dstFormat);
    c->srcXYZ    |= handle_xyz(&c->srcFormat);
    c->dstXYZ    |= handle_xyz(&c->dstFormat);
    if (c->srcXYZ || c->dstXYZ)

static int handle_0alpha(enum AVPixelFormat *format)
    switch (*format) {
    case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;
    case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;
    case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;
    case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;
    default:                                          return 0;


# the only bgr0 pixel format I know of is x11grab but any rgb padded input should do it
ffmpeg -f x11grab -i :0.0 -filter:v "scale=w=0:h=0" -c:v libx264 -pix_fmt yuv444p out.avi
[x11grab @ 0xd0cd80] device: :0.0 -> display: :0.0 x: 0 y: 0 width: 640 height: 480
[x11grab @ 0xd0cd80] shared memory extension found
Input #0, x11grab, from ':0.0':
  Duration: N/A, start: 1387920952.573846, bitrate: 294617 kb/s
    Stream #0:0: Video: rawvideo (BGR[0] / 0x524742), bgr0, 640x480, 294617 kb/s, 29.97 tbr, 1000k tbn, 29.97 tbc
File 'out.avi' already exists. Overwrite ? [y/N] y
[swscaler @ 0xcfd020] deprecated pixel format used, make sure you did set range correctly

Change History (2)

comment:1 Changed 5 years ago by jnvsor

  • Version changed from unspecified to git-master

comment:2 Changed 5 years ago by michael

  • Reproduced by developer set
  • Resolution set to fixed
  • Status changed from new to closed
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