diff --git a/libavcodec/pnmenc.c b/libavcodec/pnmenc.c
index 80c7b66332..2e8b6372a3 100644
--- a/libavcodec/pnmenc.c
+++ b/libavcodec/pnmenc.c
@@ -23,6 +23,7 @@
 #include "libavutil/imgutils.h"
 #include "libavutil/pixdesc.h"
 #include "avcodec.h"
+#include "encode.h"
 #include "internal.h"
 
 static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
@@ -34,7 +35,7 @@ static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
     int size = av_image_get_buffer_size(avctx->pix_fmt,
                                         avctx->width, avctx->height, 1);
 
-    if ((ret = ff_alloc_packet2(avctx, pkt, size + 200, 0)) < 0)
+    if ((ret = ff_get_encode_buffer(avctx, pkt, size + 200, 0)) < 0)
         return ret;
 
     bytestream_start =
@@ -141,8 +142,8 @@ static int pnm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                 ptr2 += p->linesize[2];
         }
     }
-    pkt->size   = bytestream - bytestream_start;
     pkt->flags |= AV_PKT_FLAG_KEY;
+    av_shrink_packet(pkt, bytestream - bytestream_start);
     *got_packet = 1;
 
     return 0;
@@ -154,6 +155,7 @@ const AVCodec ff_pgm_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("PGM (Portable GrayMap) image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PGM,
+    .capabilities   = AV_CODEC_CAP_DR1,
     .encode2        = pnm_encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_NONE
@@ -168,6 +170,7 @@ const AVCodec ff_pgmyuv_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("PGMYUV (Portable GrayMap YUV) image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PGMYUV,
+    .capabilities   = AV_CODEC_CAP_DR1,
     .encode2        = pnm_encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_NONE
@@ -182,6 +185,7 @@ const AVCodec ff_ppm_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("PPM (Portable PixelMap) image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PPM,
+    .capabilities   = AV_CODEC_CAP_DR1,
     .encode2        = pnm_encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]){
         AV_PIX_FMT_RGB24, AV_PIX_FMT_RGB48BE, AV_PIX_FMT_NONE
@@ -196,6 +200,7 @@ const AVCodec ff_pbm_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("PBM (Portable BitMap) image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PBM,
+    .capabilities   = AV_CODEC_CAP_DR1,
     .encode2        = pnm_encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_MONOWHITE,
                                                   AV_PIX_FMT_NONE },
@@ -209,6 +214,7 @@ const AVCodec ff_pfm_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("PFM (Portable FloatMap) image"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_PFM,
+    .capabilities   = AV_CODEC_CAP_DR1,
     .encode2        = pnm_encode_frame,
     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_GBRPF32,
                                                     AV_PIX_FMT_NONE },