Add a parameter to libaom-av1 encoder to enforce some of the single image constraints in the AV1 encoder. Setting this flag will limit the encoder to producing exactly one frame and the sequence header that is produced by the encoder will be conformant to the AVIF specification [1].
Part of Fixing Trac ticket #7621 [1] https://aomediacodec.github.io/av1-avif Signed-off-by:: Vignesh Venkatasubramanian <vigne...@google.com> --- libavcodec/libaomenc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/libavcodec/libaomenc.c b/libavcodec/libaomenc.c index 054903e6e2..0411773bbf 100644 --- a/libavcodec/libaomenc.c +++ b/libavcodec/libaomenc.c @@ -100,6 +100,7 @@ typedef struct AOMEncoderContext { int enable_restoration; int usage; int tune; + int still_picture; int enable_rect_partitions; int enable_1to4_partitions; int enable_ab_partitions; @@ -747,6 +748,18 @@ static av_cold int aom_init(AVCodecContext *avctx, if (res < 0) return res; + if (ctx->still_picture) { + // Set the maximum number of frames to 1. This will let libaom set + // still_picture and reduced_still_picture_header to 1 in the Sequence + // Header as required by AVIF still images. + enccfg.g_limit = 1; + // Reduce memory usage for still images. + enccfg.g_lag_in_frames = 0; + // All frames will be key frames. + enccfg.kf_max_dist = 0; + enccfg.kf_mode = AOM_KF_DISABLED; + } + /* Construct Encoder Context */ res = aom_codec_enc_init(&ctx->encoder, iface, &enccfg, flags); if (res != AOM_CODEC_OK) { @@ -1291,6 +1304,7 @@ static const AVOption options[] = { { "psnr", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AOM_TUNE_PSNR}, 0, 0, VE, "tune"}, { "ssim", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = AOM_TUNE_SSIM}, 0, 0, VE, "tune"}, FF_AV1_PROFILE_OPTS + { "still-picture", "Encode in single frame mode (typically used for still AVIF images).", OFFSET(still_picture), AV_OPT_TYPE_BOOL, {.i64 = 0}, -1, 1, VE }, { "enable-rect-partitions", "Enable rectangular partitions", OFFSET(enable_rect_partitions), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, VE}, { "enable-1to4-partitions", "Enable 1:4/4:1 partitions", OFFSET(enable_1to4_partitions), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, VE}, { "enable-ab-partitions", "Enable ab shape partitions", OFFSET(enable_ab_partitions), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, VE}, -- 2.35.1.1178.g4f1659d476-goog _______________________________________________ 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".
