[FFmpeg-devel] [PATCH 3/3] avformat/movenc: Add support for AVIF muxing

"zhilizhao(赵志立)" quinkblack at foxmail.com
Wed May 4 05:46:29 EEST 2022



> On May 3, 2022, at 5:35 AM, Vignesh Venkatasubramanian <vigneshv-at-google.com at ffmpeg.org> wrote:
> 
> Add an AVIF muxer by re-using the existing the mov/mp4 muxer.
> 
> AVIF Specification: https://aomediacodec.github.io/av1-avif
> 
> Sample usage for still image:
> ffmpeg -i image.png -c:v libaom-av1 -avif-image 1 image.avif
> 
> Sample usage for animated AVIF image:
> ffmpeg -i video.mp4 animated.avif
> 
> We can re-use any of the AV1 encoding options that will make
> sense for image encoding (like bitrate, tiles, encoding speed,
> etc).
> 
> The files generated by this muxer has been verified to be valid
> AVIF files by the following:
> 1) Displays on Chrome (both still and animated images).
> 2) Displays on Firefox (only still images, firefox does not support
>   animated AVIF yet).
> 3) Verified to be valid by Compliance Warden:
>   https://github.com/gpac/ComplianceWarden
> 
> Fixes the encoder/muxer part of Trac Ticket #7621
> 
> Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
> ---
> configure                |   1 +
> libavformat/allformats.c |   1 +
> libavformat/movenc.c     | 335 ++++++++++++++++++++++++++++++++++++---
> libavformat/movenc.h     |   5 +
> 4 files changed, 317 insertions(+), 25 deletions(-)
> 
> 

[…]

> static int mov_write_video_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext *mov, MOVTrack *track)
> {
>     int ret = AVERROR_BUG;
> @@ -2156,6 +2176,8 @@ static int mov_write_video_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
>     avio_wb32(pb, 0); /* size */
>     if (mov->encryption_scheme != MOV_ENC_NONE) {
>         ffio_wfourcc(pb, "encv");
> +    } else if (track->mode == MODE_AVIF) {
> +        ffio_wfourcc(pb, "av01");

Can the ‘else’ path handle the case?

>     } else {
>         avio_wl32(pb, track->tag); // store it byteswapped
>     }
> @@ -2272,7 +2294,7 @@ static int mov_write_video_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
>         else
>             av_log(mov->fc, AV_LOG_WARNING, "Not writing 'gama' atom. Format is not MOV.\n");
>     }
> -    if (track->mode == MODE_MOV || track->mode == MODE_MP4) {
> +    if (track->mode == MODE_MOV || track->mode == MODE_MP4 || track->mode == MODE_AVIF) {
>         int has_color_info = track->par->color_primaries != AVCOL_PRI_UNSPECIFIED &&
>                              track->par->color_trc != AVCOL_TRC_UNSPECIFIED &&
>                              track->par->color_space != AVCOL_SPC_UNSPECIFIED;
> @@ -2324,6 +2346,9 @@ static int mov_write_video_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContex
>     if (avid)
>         avio_wb32(pb, 0);
> 
> +    if (track->mode == MODE_AVIF)
> +        mov_write_ccst_tag(pb);
> +
>     return update_size(pb, pos);
> }
> 
> @@ -2825,7 +2850,10 @@ static int mov_write_hdlr_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *tra
> 
>     if (track) {
>         hdlr = (track->mode == MODE_MOV) ? "mhlr" : "\0\0\0\0";
> -        if (track->par->codec_type == AVMEDIA_TYPE_VIDEO) {
> +        if (track->mode == MODE_AVIF) {
> +            hdlr_type = "pict";
> +            descr = "PictureHandler";
> +        } else if (track->par->codec_type == AVMEDIA_TYPE_VIDEO) {

I prefer put check inside the ‘if (track->par->codec_type == AVMEDIA_TYPE_VIDEO)’.
It’s a special case of ‘AVMEDIA_TYPE_VIDEO’.

>             hdlr_type = "vide";
>             descr     = "VideoHandler";
>         } else if (track->par->codec_type == AVMEDIA_TYPE_AUDIO) {
> @@ -2892,6 +2920,128 @@ static int mov_write_hdlr_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *tra
>     return update_size(pb, pos);
> }
> 
> +static int mov_write_pitm_tag(AVIOContext *pb, int item_id)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "pitm");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_wb16(pb, item_id); /* item_id */
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_iloc_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "iloc");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_w8(pb, (4 << 4) + 4); /* offset_size(4) and length_size(4) */
> +    avio_w8(pb, 0); /* base_offset_size(4) and reserved(4) */
> +    avio_wb16(pb, 1); /* item_count */
> +
> +    avio_wb16(pb, 1); /* item_id */
> +    avio_wb16(pb, 0); /* data_reference_index */
> +    avio_wb16(pb, 1); /* extent_count */
> +    mov->avif_extent_pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* extent_offset (written later) */
> +    // For animated AVIF, we simply write the first packet's size.
> +    avio_wb32(pb, mov->avif_extent_length); /* extent_length */
> +
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_iinf_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t infe_pos;
> +    int64_t iinf_pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "iinf");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_wb16(pb, 1); /* entry_count */
> +
> +    infe_pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "infe");
> +    avio_w8(pb, 0x2); /* Version */
> +    avio_wb24(pb, 0); /* flags */
> +    avio_wb16(pb, 1); /* item_id */
> +    avio_wb16(pb, 0); /* item_protection_index */
> +    avio_write(pb, "av01", 4); /* item_type */
> +    avio_write(pb, "Color\0", 6); /* item_name */
> +    update_size(pb, infe_pos);
> +
> +    return update_size(pb, iinf_pos);
> +}
> +
> +static int mov_write_ispe_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "ispe");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_wb32(pb, s->streams[0]->codecpar->width); /* image_width */
> +    avio_wb32(pb, s->streams[0]->codecpar->height); /* image_height */
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_pixi_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(s->streams[0]->codecpar->format);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "pixi");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_w8(pb, pixdesc->nb_components); /* num_channels */
> +    for (int i = 0; i < pixdesc->nb_components; ++i) {
> +      avio_w8(pb, pixdesc->comp[i].depth); /* bits_per_channel */
> +    }
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_ipco_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "ipco");
> +    mov_write_ispe_tag(pb, mov, s);
> +    mov_write_pixi_tag(pb, mov, s);
> +    mov_write_av1c_tag(pb, &mov->tracks[0]);
> +    mov_write_colr_tag(pb, &mov->tracks[0], 0);
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_ipma_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "ipma");
> +    avio_wb32(pb, 0); /* Version & flags */
> +    avio_wb32(pb, 1); /* entry_count */
> +    avio_wb16(pb, 1); /* item_ID */
> +    avio_w8(pb, 4); /* association_count */
> +
> +    // ispe association.
> +    avio_w8(pb, 1); /* essential and property_index */
> +    // pixi association.
> +    avio_w8(pb, 2); /* essential and property_index */
> +    // av1C association.
> +    avio_w8(pb, 0x80 | 3); /* essential and property_index */
> +    // colr association.
> +    avio_w8(pb, 4); /* essential and property_index */
> +    return update_size(pb, pos);
> +}
> +
> +static int mov_write_iprp_tag(AVIOContext *pb, MOVMuxContext *mov, AVFormatContext *s)
> +{
> +    int64_t pos = avio_tell(pb);
> +    avio_wb32(pb, 0); /* size */
> +    ffio_wfourcc(pb, "iprp");
> +    mov_write_ipco_tag(pb, mov, s);
> +    mov_write_ipma_tag(pb, mov, s);
> +    return update_size(pb, pos);
> +}
> +
> static int mov_write_hmhd_tag(AVIOContext *pb)
> {
>     /* This atom must be present, but leaving the values at zero
> @@ -3089,7 +3239,7 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVMuxContext *mov,
>             display_matrix = NULL;
>     }
> 
> -    if (track->flags & MOV_TRACK_ENABLED)
> +    if (track->flags & MOV_TRACK_ENABLED || track->mode == MODE_AVIF)
>         flags |= MOV_TKHD_FLAG_ENABLED;

Set track->flags properly to avoid adding the mode check everywhere.

> 
>     if (track->mode == MODE_ISM)
> @@ -3137,7 +3287,7 @@ static int mov_write_tkhd_tag(AVIOContext *pb, MOVMuxContext *mov,
>     if (st && (track->par->codec_type == AVMEDIA_TYPE_VIDEO ||
>                track->par->codec_type == AVMEDIA_TYPE_SUBTITLE)) {
>         int64_t track_width_1616;
> -        if (track->mode == MODE_MOV) {
> +        if (track->mode == MODE_MOV || track->mode == MODE_AVIF) {
>             track_width_1616 = track->par->width * 0x10000ULL;
>         } else {
>             track_width_1616 = av_rescale(st->sample_aspect_ratio.num,
> @@ -3472,7 +3622,8 @@ static int mov_write_trak_tag(AVFormatContext *s, AVIOContext *pb, MOVMuxContext
>             mov_write_tapt_tag(pb, track);
>         }
>     }
> -    mov_write_track_udta_tag(pb, mov, st);
> +    if (track->mode != MODE_AVIF)
> +        mov_write_track_udta_tag(pb, mov, st);

Please check if the check can be removed. mov_write_track_udta_tag() does nothing
for mode other than MOV/MP4.

>     track->entry = entry_backup;
>     track->chunkCount = chunk_backup;
>     return update_size(pb, pos);
> @@ -3947,8 +4098,15 @@ static int mov_write_meta_tag(AVIOContext *pb, MOVMuxContext *mov,
>         mov_write_mdta_hdlr_tag(pb, mov, s);
>         mov_write_mdta_keys_tag(pb, mov, s);
>         mov_write_mdta_ilst_tag(pb, mov, s);
> -    }
> -    else {
> +    } else if (mov->mode == MODE_AVIF) {
> +        mov_write_hdlr_tag(s, pb, &mov->tracks[0]);
> +        // We always write the primary item id as 1 since only one track is
> +        // supported for AVIF.
> +        mov_write_pitm_tag(pb, 1);
> +        mov_write_iloc_tag(pb, mov, s);
> +        mov_write_iinf_tag(pb, mov, s);
> +        mov_write_iprp_tag(pb, mov, s);
> +    } else {
>         /* iTunes metadata tag */
>         mov_write_itunes_hdlr_tag(pb, mov, s);
>         mov_write_ilst_tag(pb, mov, s);
> @@ -4278,10 +4436,11 @@ static int mov_write_moov_tag(AVIOContext *pb, MOVMuxContext *mov,
>     }
> 
>     mov_write_mvhd_tag(pb, mov);
> -    if (mov->mode != MODE_MOV && !mov->iods_skip)
> +    if (mov->mode != MODE_MOV && mov->mode != MODE_AVIF && !mov->iods_skip)
>         mov_write_iods_tag(pb, mov);
>     for (i = 0; i < mov->nb_streams; i++) {
> -        if (mov->tracks[i].entry > 0 || mov->flags & FF_MOV_FLAG_FRAGMENT) {
> +        if (mov->tracks[i].entry > 0 || mov->flags & FF_MOV_FLAG_FRAGMENT ||
> +            mov->mode == MODE_AVIF) {
>             int ret = mov_write_trak_tag(s, pb, mov, &(mov->tracks[i]), i < s->nb_streams ? s->streams[i] : NULL);
>             if (ret < 0)
>                 return ret;
> @@ -4292,7 +4451,7 @@ static int mov_write_moov_tag(AVIOContext *pb, MOVMuxContext *mov,
> 
>     if (mov->mode == MODE_PSP)
>         mov_write_uuidusmt_tag(pb, s);
> -    else
> +    else if (mov->mode != MODE_AVIF)
>         mov_write_udta_tag(pb, mov, s);
> 
>     return update_size(pb, pos);
> @@ -5039,6 +5198,9 @@ static void mov_write_ftyp_tag_internal(AVIOContext *pb, AVFormatContext *s,
>     else if (mov->mode == MODE_3GP) {
>         ffio_wfourcc(pb, has_h264 ? "3gp6"  : "3gp4");
>         minor =     has_h264 ?   0x100 :   0x200;
> +    } else if (mov->mode == MODE_AVIF) {
> +        ffio_wfourcc(pb, mov->is_animated_avif ? "avis" : "avif");
> +        minor = 0;
>     } else if (mov->mode & MODE_3G2) {
>         ffio_wfourcc(pb, has_h264 ? "3g2b"  : "3g2a");
>         minor =     has_h264 ? 0x20000 : 0x10000;
> @@ -5102,6 +5264,31 @@ static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)
>     // compatible brand a second time.
>     if (mov->mode == MODE_ISM) {
>         ffio_wfourcc(pb, "piff");
> +    } else if (mov->mode == MODE_AVIF) {
> +        const AVPixFmtDescriptor *pix_fmt_desc =
> +            av_pix_fmt_desc_get(s->streams[0]->codecpar->format);
> +        const int depth = pix_fmt_desc->comp[0].depth;
> +        if (mov->is_animated_avif) {
> +            // For animated AVIF, major brand is "avis". Add "avif" as a
> +            // compatible brand.
> +            ffio_wfourcc(pb, "avif");
> +            ffio_wfourcc(pb, "msf1");
> +            ffio_wfourcc(pb, "iso8");
> +        }
> +        ffio_wfourcc(pb, "mif1");
> +        ffio_wfourcc(pb, "miaf");
> +        if (depth == 8 || depth == 10) {
> +            // MA1B and MA1A brands are based on AV1 profile. Short hand for
> +            // computing that is based on chroma subsampling type. 420 chroma
> +            // subsampling is MA1B.  444 chroma subsampling is MA1A.
> +            if (!pix_fmt_desc->log2_chroma_w && !pix_fmt_desc->log2_chroma_h) {
> +                // 444 chroma subsampling.
> +                ffio_wfourcc(pb, "MA1A");
> +            } else {
> +                // 420 chroma subsampling.
> +                ffio_wfourcc(pb, "MA1B");
> +            }
> +        }
>     } else if (mov->mode != MODE_MOV) {
>         // We add tfdt atoms when fragmenting, signal this with the iso6 compatible
>         // brand, if not already the major brand. This is compatible with users that
> @@ -5705,7 +5892,7 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
>     if (ret < 0)
>         return ret;
> 
> -    if (mov->flags & FF_MOV_FLAG_FRAGMENT) {
> +    if (mov->flags & FF_MOV_FLAG_FRAGMENT || mov->mode == MODE_AVIF) {
>         int ret;
>         if (mov->moov_written || mov->flags & FF_MOV_FLAG_EMPTY_MOOV) {
>             if (mov->frag_interleave && mov->fragments > 0) {
> @@ -5846,7 +6033,11 @@ int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)
>             avio_write(pb, reformatted_data, size);
>         } else {
>             size = ff_av1_filter_obus(pb, pkt->data, pkt->size);
> +            if (trk->mode == MODE_AVIF && !mov->avif_extent_length) {
> +                mov->avif_extent_length = size;
> +            }
>         }
> +
> #if CONFIG_AC3_PARSER
>     } else if (par->codec_id == AV_CODEC_ID_EAC3) {
>         size = handle_eac3(mov, pkt, trk);
> @@ -6579,11 +6770,15 @@ static int mov_init(AVFormatContext *s)
>     else if (IS_MODE(ipod, IPOD)) mov->mode = MODE_IPOD;
>     else if (IS_MODE(ismv, ISMV)) mov->mode = MODE_ISM;
>     else if (IS_MODE(f4v,   F4V)) mov->mode = MODE_F4V;
> +    else if (IS_MODE(avif, AVIF)) mov->mode = MODE_AVIF;
> #undef IS_MODE
> 
>     if (mov->flags & FF_MOV_FLAG_DELAY_MOOV)
>         mov->flags |= FF_MOV_FLAG_EMPTY_MOOV;
> 
> +    if (mov->mode == MODE_AVIF)
> +        mov->flags |= FF_MOV_FLAG_DELAY_MOOV;
> +
>     /* Set the FRAGMENT flag if any of the fragmentation methods are
>      * enabled. */
>     if (mov->max_fragment_duration || mov->max_fragment_size ||
> @@ -6664,11 +6859,24 @@ static int mov_init(AVFormatContext *s)
>     /* Non-seekable output is ok if using fragmentation. If ism_lookahead
>      * is enabled, we don't support non-seekable output at all. */
>     if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL) &&
> -        (!(mov->flags & FF_MOV_FLAG_FRAGMENT) || mov->ism_lookahead)) {
> +        (!(mov->flags & FF_MOV_FLAG_FRAGMENT) || mov->ism_lookahead ||
> +         mov->mode == MODE_AVIF)) {
>         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
>         return AVERROR(EINVAL);
>     }
> 
> +    /* AVIF output must have exactly one video stream */
> +    if (mov->mode == MODE_AVIF) {
> +        if (s->nb_streams > 1) {
> +            av_log(s, AV_LOG_ERROR, "AVIF output requires exactly one stream\n");
> +            return AVERROR(EINVAL);
> +        }
> +        if (s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) {
> +            av_log(s, AV_LOG_ERROR, "AVIF output requires one video stream\n");
> +            return AVERROR(EINVAL);
> +        }
> +    }
> +
>     mov->nb_streams = s->nb_streams;
>     if (mov->mode & (MODE_MP4|MODE_MOV|MODE_IPOD) && s->nb_chapters)
>         mov->chapter_track = mov->nb_streams++;
> @@ -6811,12 +7019,13 @@ static int mov_init(AVFormatContext *s)
>                         pix_fmt == AV_PIX_FMT_MONOWHITE ||
>                         pix_fmt == AV_PIX_FMT_MONOBLACK;
>             }
> -            if (track->par->codec_id == AV_CODEC_ID_VP9 ||
> -                track->par->codec_id == AV_CODEC_ID_AV1) {
> -                if (track->mode != MODE_MP4) {
> -                    av_log(s, AV_LOG_ERROR, "%s only supported in MP4.\n", avcodec_get_name(track->par->codec_id));
> -                    return AVERROR(EINVAL);
> -                }
> +            if (track->par->codec_id == AV_CODEC_ID_VP9 && track->mode != MODE_MP4) {
> +                av_log(s, AV_LOG_ERROR, "%s only supported in MP4.\n", avcodec_get_name(track->par->codec_id));
> +                return AVERROR(EINVAL);
> +            } else if (track->par->codec_id == AV_CODEC_ID_AV1 &&
> +                       track->mode != MODE_MP4 && track->mode != MODE_AVIF) {
> +                av_log(s, AV_LOG_ERROR, "%s only supported in MP4 and AVIF.\n", avcodec_get_name(track->par->codec_id));
> +                return AVERROR(EINVAL);
>             } else if (track->par->codec_id == AV_CODEC_ID_VP8) {
>                 /* altref frames handling is not defined in the spec as of version v1.0,
>                  * so just forbid muxing VP8 streams altogether until a new version does */
> @@ -7034,7 +7243,7 @@ static int mov_write_header(AVFormatContext *s)
>                             FF_MOV_FLAG_FRAG_EVERY_FRAME)) &&
>             !mov->max_fragment_duration && !mov->max_fragment_size)
>             mov->flags |= FF_MOV_FLAG_FRAG_KEYFRAME;
> -    } else {
> +    } else if (mov->mode != MODE_AVIF) {
>         if (mov->flags & FF_MOV_FLAG_FASTSTART)
>             mov->reserved_header_pos = avio_tell(pb);
>         mov_write_mdat_tag(pb, mov);
> @@ -7322,6 +7531,50 @@ static int mov_check_bitstream(AVFormatContext *s, AVStream *st,
>     return ret;
> }
> 
> +static int avif_write_trailer(AVFormatContext *s)
> +{
> +    AVIOContext *pb = s->pb;
> +    MOVMuxContext *mov = s->priv_data;
> +    int64_t pos_backup, mdat_pos;
> +    uint8_t *buf;
> +    int buf_size, moov_size;
> +
> +    if (mov->moov_written) return 0;
> +
> +    mov->is_animated_avif = s->streams[0]->nb_frames > 1;
> +    mov_write_identification(pb, s);
> +    mov_write_meta_tag(pb, mov, s);
> +
> +    moov_size = get_moov_size(s);
> +    mov->tracks[0].data_offset = avio_tell(pb) + moov_size + 8;
> +
> +    if (mov->is_animated_avif) {
> +        int ret;
> +        if ((ret = mov_write_moov_tag(pb, mov, s)) < 0)
> +            return ret;
> +    }
> +
> +    buf_size = avio_get_dyn_buf(mov->mdat_buf, &buf);
> +    avio_wb32(pb, buf_size + 8);
> +    ffio_wfourcc(pb, "mdat");
> +    mdat_pos = avio_tell(pb);
> +
> +    if (mdat_pos != (uint32_t)mdat_pos) {
> +        av_log(s, AV_LOG_ERROR, "mdat offset does not fit in 32 bits\n");
> +        return AVERROR_INVALIDDATA;
> +    }
> +
> +    avio_write(pb, buf, buf_size);
> +
> +    // write extent offset.
> +    pos_backup = avio_tell(pb);
> +    avio_seek(pb, mov->avif_extent_pos, SEEK_SET);
> +    avio_wb32(pb, mdat_pos); /* rewrite offset */
> +    avio_seek(pb, pos_backup, SEEK_SET);
> +
> +    return 0;
> +}
> +
> #if CONFIG_TGP_MUXER || CONFIG_TG2_MUXER
> static const AVCodecTag codec_3gp_tags[] = {
>     { AV_CODEC_ID_H263,     MKTAG('s','2','6','3') },
> @@ -7404,6 +7657,20 @@ static const AVCodecTag codec_f4v_tags[] = {
>     { AV_CODEC_ID_NONE, 0 },
> };
> 
> +#if CONFIG_AVIF_MUXER
> +static const AVCodecTag codec_avif_tags[] = {
> +    { AV_CODEC_ID_AV1,     MKTAG('a','v','0','1') },
> +    { AV_CODEC_ID_NONE, 0 },
> +};
> +static const AVCodecTag *const codec_avif_tags_list[] = { codec_avif_tags, NULL };
> +
> +static const AVClass mov_avif_muxer_class = {
> +    .class_name = "avif muxer",
> +    .item_name  = av_default_item_name,
> +    .version    = LIBAVUTIL_VERSION_INT,
> +};
> +#endif
> +
> #if CONFIG_MOV_MUXER
> const AVOutputFormat ff_mov_muxer = {
>     .name              = "mov",
> @@ -7566,3 +7833,21 @@ const AVOutputFormat ff_f4v_muxer = {
>     .priv_class        = &mov_isobmff_muxer_class,
> };
> #endif
> +#if CONFIG_AVIF_MUXER
> +const AVOutputFormat ff_avif_muxer = {
> +    .name              = "avif",
> +    .long_name         = NULL_IF_CONFIG_SMALL("AVIF"),
> +    .mime_type         = "image/avif",
> +    .extensions        = "avif",
> +    .priv_data_size    = sizeof(MOVMuxContext),
> +    .video_codec       = AV_CODEC_ID_AV1,
> +    .init              = mov_init,
> +    .write_header      = mov_write_header,
> +    .write_packet      = mov_write_packet,
> +    .write_trailer     = avif_write_trailer,
> +    .deinit            = mov_free,
> +    .flags             = AVFMT_GLOBALHEADER | AVFMT_ALLOW_FLUSH,
> +    .codec_tag         = codec_avif_tags_list,
> +    .priv_class        = &mov_avif_muxer_class,
> +};
> +#endif
> diff --git a/libavformat/movenc.h b/libavformat/movenc.h
> index ca507e0e04..281576cc66 100644
> --- a/libavformat/movenc.h
> +++ b/libavformat/movenc.h
> @@ -43,6 +43,7 @@
> #define MODE_IPOD 0x20
> #define MODE_ISM  0x40
> #define MODE_F4V  0x80
> +#define MODE_AVIF 0x100
> 
> typedef struct MOVIentry {
>     uint64_t     pos;
> @@ -244,6 +245,10 @@ typedef struct MOVMuxContext {
>     MOVPrftBox write_prft;
>     int empty_hdlr_name;
>     int movie_timescale;
> +
> +    int64_t avif_extent_pos;
> +    int avif_extent_length;
> +    int is_animated_avif;
> } MOVMuxContext;
> 
> #define FF_MOV_FLAG_RTP_HINT              (1 <<  0)
> -- 
> 2.36.0.464.gb9c8b46e94-goog
> 
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