In webm specification, it supports cropping information. (https://www.webmproject.org/docs/container/) In ffmpeg, the implementation of webm is a subset of matroska. In matroskadec.c, those cropping related four fields are forced to 0.
for the sample file with crop (crop_bottom =8, crop_top=crop_left=crop_right=0.) ffmpeg.exe -i test_with_container_crop.webm -pix_fmt yuv420p -y output.yuv original ffmpeg code - the output.yuv resolution is 1920x1088 changed code - the output.yuv resolution is 1920x1080 Previous discussion :https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=7668 --- libavformat/matroskadec.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index d582f566a2..2023fd4977 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -210,6 +210,10 @@ typedef struct MatroskaTrackVideo { uint64_t pixel_width; uint64_t pixel_height; EbmlBin color_space; + uint64_t pixel_cropt; + uint64_t pixel_cropl; + uint64_t pixel_cropb; + uint64_t pixel_cropr; uint64_t display_unit; uint64_t interlaced; uint64_t field_order; @@ -517,10 +521,10 @@ static EbmlSyntax matroska_track_video[] = { { MATROSKA_ID_VIDEOALPHAMODE, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, alpha_mode), { .u = 0 } }, { MATROSKA_ID_VIDEOCOLOR, EBML_NEST, 0, sizeof(MatroskaTrackVideoColor), offsetof(MatroskaTrackVideo, color), { .n = matroska_track_video_color } }, { MATROSKA_ID_VIDEOPROJECTION, EBML_NEST, 0, 0, offsetof(MatroskaTrackVideo, projection), { .n = matroska_track_video_projection } }, - { MATROSKA_ID_VIDEOPIXELCROPB, EBML_NONE }, - { MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE }, - { MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE }, - { MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE }, + { MATROSKA_ID_VIDEOPIXELCROPT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_cropt), {.u = 0 } }, + { MATROSKA_ID_VIDEOPIXELCROPL, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_cropl), {.u = 0 } }, + { MATROSKA_ID_VIDEOPIXELCROPB, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_cropb), {.u = 0 } }, + { MATROSKA_ID_VIDEOPIXELCROPR, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, pixel_cropr), {.u = 0 } }, { MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } }, { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } }, { MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } }, @@ -2879,6 +2883,11 @@ static int matroska_parse_tracks(AVFormatContext *s) st->codecpar->width = track->video.pixel_width; st->codecpar->height = track->video.pixel_height; + st->codecpar->container_crop_top = track->video.pixel_cropt; + st->codecpar->container_crop_left = track->video.pixel_cropl; + st->codecpar->container_crop_bottom = track->video.pixel_cropb; + st->codecpar->container_crop_right = track->video.pixel_cropr; + if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_INTERLACED) st->codecpar->field_order = mkv_field_order(matroska, track->video.field_order); else if (track->video.interlaced == MATROSKA_VIDEO_INTERLACE_FLAG_PROGRESSIVE) -- 2.30.0.windows.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
