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【飞凌RK3588开发板试用】ffmpeg开发系列之三——编解码

jf_1137202360

2023-3-21 23:31:27 5318 RK3588 飞凌

0 本帖最后由 jf_1137202360 于 2023-3-22 10:03 编辑前言前面我们搭建了ffmpeg的开发环境,进行构建和测试。这一篇实际进行代码编写测试。准备我们可以按照之前的文章从源码构建ffmpeg安装,也可以直接下载编译好的库使用。 wget https://github.com/BtbN/FFmpeg-B ... 4-gpl-shared.tar.xz sudo apt-get install xz-utils xz -d ffmpeg-master-latest-linuxARM64-gpl-shared.tar.xz tar -xvf ffmpeg-master-latest-linuxarm64-gpl-shared.tar 编码测试代码 vi encode_video.c 代码如下 #include #include #include #include #include #include static void encode(AVCodecContext enc_ctx, AVFrame frame, AVPacket pkt, FILE outfile) { int ret; /* send the frame to the encoder / if (frame) printf("Send frame %3"PRId64"n", frame->pts); ret = avcodec_send_frame(enc_ctx, frame); if (ret < 0) { fprintf(stderr, "Error sending a frame for encodingn"); exit(1); } while (ret >= 0) { ret = avcodec_receive_packet(enc_ctx, pkt); if (ret == AVERROR(EAGAIN) \|\| ret == AVERROR_EOF) return; else if (ret < 0) { fprintf(stderr, "Error during encodingn"); exit(1); } printf("Write packet %3"PRId64" (size=%5d)n", pkt->pts, pkt->size); fwrite(pkt->data, 1, pkt->size, outfile); av_packet_unref(pkt); } } int main(int argc, char argv) { const char filename, codec_name; const AVCodec codec; AVCodecContext c= NULL; int i, ret, x, y; FILE f; AVFrame frame; AVPacket pkt; uint8_t endcode[] = { 0, 0, 1, 0xb7 }; if (argc <= 2) { fprintf(stderr, "Usage: %s n", argv[0]); exit(0); } filename = argv[1]; codec_name = argv[2]; /* find the mpeg1video encoder / codec = avcodec_find_encoder_by_name(codec_name); if (!codec) { fprintf(stderr, "Codec '%s' not foundn", codec_name); exit(1); } c = avcodec_alloc_context3(codec); if (!c) { fprintf(stderr, "Could not allocate video codec contextn"); exit(1); } pkt = av_packet_alloc(); if (!pkt) exit(1); / put sample parameters / c->bit_rate = 400000; / resolution must be a multiple of two / c->width = 352; c->height = 288; / frames per second / c->time_base = (AVRational){1, 25}; c->framerate = (AVRational){25, 1}; / emit one intra frame every ten frames * check frame pict_type before passing frame * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I * then gop_size is ignored and the output of encoder * will always be I frame irrespective to gop_size / c->gop_size = 10; c->max_b_frames = 1; c->pix_fmt = AV_PIX_FMT_YUV420P; if (codec->id == AV_CODEC_ID_H264) av_opt_set(c->priv_data, "preset", "slow", 0); / open it / ret = avcodec_open2(c, codec, NULL); if (ret < 0) { fprintf(stderr, "Could not open codec: %sn", av_err2str(ret)); exit(1); } f = fopen(filename, "wb"); if (!f) { fprintf(stderr, "Could not open %sn", filename); exit(1); } frame = av_frame_alloc(); if (!frame) { fprintf(stderr, "Could not allocate video framen"); exit(1); } frame->format = c->pix_fmt; frame->width = c->width; frame->height = c->height; ret = av_frame_get_buffer(frame, 0); if (ret < 0) { fprintf(stderr, "Could not allocate the video frame datan"); exit(1); } / encode 1 second of video / for (i = 0; i < 25; i++) { fflush(stdout); / Make sure the frame data is writable. On the first round, the frame is fresh from av_frame_get_buffer() and therefore we know it is writable. But on the next rounds, encode() will have called avcodec_send_frame(), and the codec may have kept a reference to the frame in its internal structures, that makes the frame unwritable. av_frame_make_writable() checks that and allocates a new buffer for the frame only if necessary. / ret = av_frame_make_writable(frame); if (ret < 0) exit(1); / Prepare a dummy image. In real code, this is where you would have your own logic for filling the frame. FFmpeg does not care what you put in the frame. / / Y / for (y = 0; y < c->height; y++) { for (x = 0; x < c->width; x++) { frame->data[0][y frame->linesize[0] + x] = x + y + i * 3; } } /* Cb and Cr / for (y = 0; y < c->height/2; y++) { for (x = 0; x < c->width/2; x++) { frame->data[1][y frame->linesize[1] + x] = 128 + y + i * 2; frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5; } } frame->pts = i; /* encode the image / encode(c, frame, pkt, f); } / flush the encoder / encode(c, NULL, pkt, f); / Add sequence end code to have a real MPEG file. It makes only sense because this tiny examples writes packets directly. This is called "elementary stream" and only works for some codecs. To create a valid file, you usually need to write packets into a proper file format or protocol; see mux.c. / if (codec->id == AV_CODEC_ID_MPEG1VIDEO \|\| codec->id == AV_CODEC_ID_MPEG2VIDEO) fwrite(endcode, 1, sizeof(endcode), f); fclose(f); avcodec_free_context(&c); av_frame_free(&frame); av_packet_free(&pkt); return 0; } 复制代码* 编译 gcc encode_video.c -Iffmpeg-master-latest-linuxarm64-gpl-shared/include -Lffmpeg-master-latest-linuxarm64-gpl-shared/lib -lavcodec -lavutil -lswresample -o encode 运行 export LD_LIBRARY_PATH=/root/ffmpeg-master-latest-linuxarm64-gpl-shared/lib:$LD_LIBRARY_PATH ./encode encode.bin mpeg1video 结果 root@ok3588:~# export LD_LIBRARY_PATH=/root/ffmpeg-master-latest-linuxarm64-gpl-shared/lib:$LD_LIBRARY_PATH root@ok3588:~# ./encode encode.bin mpeg1video Send frame 0 Send frame 1 Write packet 0 (size= 6731) Send frame 2 Write packet 2 (size= 3727) Send frame 3 Write packet 1 (size= 1698) Send frame 4 Write packet 4 (size= 2744) Send frame 5 Write packet 3 (size= 1676) Send frame 6 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 6 (size= 2955) Send frame 7 Write packet 5 (size= 1810) Send frame 8 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 8 (size= 3170) Send frame 9 Write packet 7 (size= 1937) Send frame 10 Write packet 10 (size=12306) Send frame 11 Write packet 9 (size= 2173) Send frame 12 Write packet 12 (size= 3770) Send frame 13 Write packet 11 (size= 2064) Send frame 14 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 14 (size= 3340) Send frame 15 Write packet 13 (size= 1941) Send frame 16 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 16 (size= 3121) Send frame 17 Write packet 15 (size= 1897) Send frame 18 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 18 (size= 3392) Send frame 19 Write packet 17 (size= 2172) Send frame 20 Write packet 20 (size=12266) Send frame 21 Write packet 19 (size= 2169) Send frame 22 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 22 (size= 4000) Send frame 23 Write packet 21 (size= 2018) Send frame 24 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 [mpeg1video @ 0x55ac6488f0] warning, clipping 1 dct coefficients to -255..255 Write packet 24 (size= 3072) Write packet 23 (size= 1935) root@ok3588:~# 复制代码解码测试代码 vi decode_video.c 代码如下 #include #include #include #include #define INBUF_SIZE 4096 static void pgm_save(unsigned char* buf, int wrap, int xsize, int ysize, char* filename) { FILE* f; int i; f = fopen(filename, "wb"); fprintf(f, "P5n%d %dn%dn", xsize, ysize, 255); for (i = 0; i < ysize; i++) fwrite(buf + i * wrap, 1, xsize, f); fclose(f); } static void decode(AVCodecContext* dec_ctx, AVFrame* frame, AVPacket* pkt, const char* filename) { char buf[1024]; int ret; ret = avcodec_send_packet(dec_ctx, pkt); if (ret < 0) { fprintf(stderr, "Error sending a packet for decodingn"); exit(1); } while (ret >= 0) { ret = avcodec_receive_frame(dec_ctx, frame); if (ret == AVERROR(EAGAIN) \|\| ret == AVERROR_EOF) return; else if (ret < 0) { fprintf(stderr, "Error during decodingn"); exit(1); } printf("saving frame %3"PRId64"n", dec_ctx->frame_num); fflush(stdout); /* the picture is allocated by the decoder. no need to free it / snprintf(buf, sizeof(buf), "%s-%"PRId64, filename, dec_ctx->frame_num); pgm_save(frame->data[0], frame->linesize[0], frame->width, frame->height, buf); } } int main(int argc, char* argv) { const char* filename, * outfilename; const AVCodec* codec; AVCodecParserContext* parser; AVCodecContext* c = NULL; FILE* f; AVFrame* frame; uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; uint8_t* data; size_t data_size; int ret; int eof; AVPacket* pkt; if (argc <= 2) { fprintf(stderr, "Usage: %s n" "And check your input file is encoded by mpeg1video please.n", argv[0]); exit(0); } filename = argv[1]; outfilename = argv[2]; pkt = av_packet_alloc(); if (!pkt) exit(1); /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) / memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE); / find the MPEG-1 video decoder / codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO); if (!codec) { fprintf(stderr, "Codec not foundn"); exit(1); } parser = av_parser_init(codec->id); if (!parser) { fprintf(stderr, "parser not foundn"); exit(1); } c = avcodec_alloc_context3(codec); if (!c) { fprintf(stderr, "Could not allocate video codec contextn"); exit(1); } / For some codecs, such as msmpeg4 and mpeg4, width and height MUST be initialized there because this information is not available in the bitstream. / / open it / if (avcodec_open2(c, codec, NULL) < 0) { fprintf(stderr, "Could not open codecn"); exit(1); } f = fopen(filename, "rb"); if (!f) { fprintf(stderr, "Could not open %sn", filename); exit(1); } frame = av_frame_alloc(); if (!frame) { fprintf(stderr, "Could not allocate video framen"); exit(1); } do { / read raw data from the input file / data_size = fread(inbuf, 1, INBUF_SIZE, f); if (ferror(f)) break; eof = !data_size; / use the parser to split the data into frames / data = inbuf; while (data_size > 0 \|\| eof) { ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size, data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0); if (ret < 0) { fprintf(stderr, "Error while parsingn"); exit(1); } data += ret; data_size -= ret; if (pkt->size) decode(c, frame, pkt, outfilename); else if (eof) break; } } while (!eof); / flush the decoder / decode(c, frame, NULL, outfilename); fclose(f); av_parser_close(parser); avcodec_free_context(&c); av_frame_free(&frame); av_packet_free(&pkt); return 0; } 复制代码* 编译 gcc decode_video.c -Iffmpeg-master-latest-linuxarm64-gpl-shared/include -Lffmpeg-master-latest-linuxarm64-gpl-shared/lib -lavcodec -lavutil -lswresample -o decode 运行 export LD_LIBRARY_PATH=/root/ffmpeg-master-latest-linuxarm64-gpl-shared/lib:$LD_LIBRARY_PATH ./decode encode.bin decode.bin 结果 root@ok3588:~# ./decode encode.bin decode.bin saving frame 1 saving frame 2 saving frame 3 saving frame 4 saving frame 5 saving frame 6 saving frame 7 saving frame 8 saving frame 9 saving frame 10 saving frame 11 saving frame 12 saving frame 13 saving frame 14 saving frame 15 saving frame 16 saving frame 17 saving frame 18 saving frame 19 saving frame 20 saving frame 21 saving frame 22 saving frame 23 saving frame 24 saving frame 25 root@ok3588:~# ls decode* -al -rwxr-xr-x 1 root root 14736 Mar 21 23:15 decode -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-1 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-10 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-11 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-12 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-13 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-14 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-15 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-16 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-17 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-18 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-19 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-2 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-20 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-21 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-22 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-23 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-24 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-25 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-3 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-4 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-5 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-6 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-7 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-8 -rw-r--r-- 1 root root 101391 Mar 21 23:20 decode.bin-9 -rw-r--r-- 1 root root 6279 Mar 21 23:05 decode_video.c root@ok3588:~# 复制代码播放可以导出编码的文件到PC进行播放 .ffplay.exe -i encode.bin 总结由于开发板运行Ubuntu系统性能非常强,能联网进行apt安装包,所以可以直接在开发板上进行开发,免去了交叉编译的麻烦,开发非常方便。通过ffmpeg编解码测试也可以体验到该开发板进行多媒体开发非常简繁方便,且运行高效。 0
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