Message ID | 54b29ce3-ca3a-58cf-0c44-adbaf4ef9541@gmail.com |
---|---|
State | Superseded |
Headers | show |
On 26/01/18 13:11, Jun Zhao wrote: > V2: - deduce output format from file extension, because VP8/VP9 encoder > need to a muxer (e,g ivf or/and mp4). > > From 9828a8889d5279202c2e8ef9429eb06ad869842b Mon Sep 17 00:00:00 2001 > From: Jun Zhao <jun.zhao@intel.com> > Date: Thu, 11 Jan 2018 15:00:30 +0800 > Subject: [PATCH V2] example/vaapi_transcode: Add a VA-API transcode example. > > Add VA-API transcoding example, useage like: > ./vaapi_transcode input_stream h264_vaapi output_stream, > and the example can't handle resolution change case. > > test case like: > - ./vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 > - ./vaapi_transcode input.mp4 vp8_vaapi output_vp8.ivf > > Signed-off-by: Jun Zhao <jun.zhao@intel.com> > Signed-off-by: Liu, Kaixuan <kaixuan.liu@intel.com> > --- > configure | 2 + > doc/examples/Makefile | 1 + > doc/examples/vaapi_transcode.c | 301 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 304 insertions(+) > create mode 100644 doc/examples/vaapi_transcode.c Generally looks good, some minor things below. Thanks, - Mark > diff --git a/configure b/configure > index fcfa7aa442..92aef31cbe 100755 > --- a/configure > +++ b/configure > @@ -1526,6 +1526,7 @@ EXAMPLE_LIST=" > transcode_aac_example > transcoding_example > vaapi_encode_example > + vaapi_transcode_example > " > > EXTERNAL_AUTODETECT_LIBRARY_LIST=" > @@ -3320,6 +3321,7 @@ scaling_video_example_deps="avutil swscale" > transcode_aac_example_deps="avcodec avformat swresample" > transcoding_example_deps="avfilter avcodec avformat avutil" > vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder" > +vaapi_transcode_example_deps="avcodec avformat avutil" Should probably depend on something VAAPI? It will build fine without it, but can't actually work at all. > > # EXTRALIBS_LIST > cpu_init_extralibs="pthreads_extralibs" > diff --git a/doc/examples/Makefile b/doc/examples/Makefile > index da5af36532..928ff306b3 100644 > --- a/doc/examples/Makefile > +++ b/doc/examples/Makefile > @@ -20,6 +20,7 @@ EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video > EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac > EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding > EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode > +EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode > > EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF)) > EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF)) > diff --git a/doc/examples/vaapi_transcode.c b/doc/examples/vaapi_transcode.c > new file mode 100644 > index 0000000000..af1550f5f2 > --- /dev/null > +++ b/doc/examples/vaapi_transcode.c > @@ -0,0 +1,301 @@ > +/* > + * Video Acceleration API (video transcoding) transcode sample > + * > + * This file is part of FFmpeg. > + * > + * FFmpeg is free software; you can redistribute it and/or > + * modify it under the terms of the GNU Lesser General Public > + * License as published by the Free Software Foundation; either > + * version 2.1 of the License, or (at your option) any later version. > + * > + * FFmpeg is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU > + * Lesser General Public License for more details. > + * > + * You should have received a copy of the GNU Lesser General Public > + * License along with FFmpeg; if not, write to the Free Software > + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA > + */ > + > +/** > + * @file > + * Intel VAAPI-accelerated transcoding example. > + * > + * @example vaapi_transcode.c > + * This example shows how to do VAAPI-accelerated transcoding. > + * Usage: vaapi_transcode input_stream h264_vaapi output_stream > + * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 > + * - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf > + */ > + > +#include <stdio.h> > +#include <errno.h> > + > +#include <libavutil/hwcontext.h> > +#include <libavcodec/avcodec.h> > +#include <libavformat/avformat.h> > + > +static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; > +static AVBufferRef *hw_device_ctx = NULL; > +static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL; > +static int video_stream = -1; > +static AVStream *ost; > +static int initialized = 0; > + > +static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx, > + const enum AVPixelFormat *pix_fmts) > +{ > + const enum AVPixelFormat *p; > + > + for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) { > + if (*p == AV_PIX_FMT_VAAPI) > + return *p; > + } > + > + fprintf(stderr, "Unable to decode this file using VA-API.\n"); > + return AV_PIX_FMT_NONE; > +} > + > +static int open_input_file(const char *filename) > +{ > + int ret; > + AVCodec *decoder = NULL; > + AVStream *video = NULL; > + > + if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { > + fprintf(stderr, "Cannot open input file '%s', Error code: %s\n", > + filename, av_err2str(ret)); > + return ret; > + } > + > + if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { > + fprintf(stderr, "Cannot find input stream information. Error code: %s\n", > + av_err2str(ret)); > + return ret; > + } > + > + ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); > + if (ret < 0) { > + fprintf(stderr, "Cannot find a video stream in the input file. " > + "Error code: %s\n", av_err2str(ret)); > + return ret; > + } > + video_stream = ret; > + > + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) > + return AVERROR(ENOMEM); > + > + video = ifmt_ctx->streams[video_stream]; > + if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) { > + fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n", > + av_err2str(ret)); > + return ret; > + } > + > + decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); Missing return value check. > + decoder_ctx->get_format = get_vaapi_format; > + > + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) > + fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n", > + av_err2str(ret)); > + > + return ret; > +} > + > +static int encode_write(AVFrame *frame) > +{ > + int ret = 0; > + AVPacket enc_pkt; > + > + av_init_packet(&enc_pkt); > + enc_pkt.data = NULL; > + enc_pkt.size = 0; > + > + if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) { > + fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret)); > + goto end; > + } > + while (1) { > + ret = avcodec_receive_packet(encoder_ctx, &enc_pkt); > + if (ret) > + break; > + > + enc_pkt.stream_index = 0; > + av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base, > + ofmt_ctx->streams[0]->time_base); > + ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); > + if (ret < 0) { > + fprintf(stderr, "Error during writing data to output file. " > + "Error code: %s\n", av_err2str(ret)); > + return -1; > + } > + } > + > +end: > + if (ret == AVERROR_EOF) > + return 0; > + ret = ((ret == AVERROR(EAGAIN)) ? 0:-1); > + return ret; > +} > + > +static int dec_enc(AVPacket *pkt, AVCodec *enc_codec, const char *file) > +{ > + AVFrame *frame; > + int ret = 0; > + > + ret = avcodec_send_packet(decoder_ctx, pkt); > + if (ret < 0) { > + fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret)); > + return ret; > + } > + > + while (ret >= 0) { > + if (!(frame = av_frame_alloc())) > + return AVERROR(ENOMEM); > + > + ret = avcodec_receive_frame(decoder_ctx, frame); > + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { > + av_frame_free(&frame); > + return 0; > + } else if (ret < 0) { > + fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret)); > + goto fail; > + } > + > + if (!initialized) { > + /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec. > + Only after we get a decoded frame, can we obtain its hw_frames_ctx */ > + encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx); > + if (!encoder_ctx->hw_frames_ctx) { > + ret = AVERROR(ENOMEM); > + goto fail; > + } > + /* set AVCodecContext Parameters for encoder, here we keep them stay > + * the same as decoder. > + * xxx: now the the sample can't handle resolution change case. > + */ > + encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate); > + encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI; > + encoder_ctx->width = decoder_ctx->width; > + encoder_ctx->height = decoder_ctx->height; > + > + if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) { > + fprintf(stderr, "Failed to open encode codec. Error code: %s\n", > + av_err2str(ret)); > + goto fail; > + } > + > + if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) { > + fprintf(stderr, "Failed to allocate stream for output format.\n"); > + ret = AVERROR(ENOMEM); > + goto fail; > + } > + > + ost->time_base = encoder_ctx->time_base; > + ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx); > + if (ret < 0) { > + fprintf(stderr, "Failed to copy the stream parameters. " > + "Error code: %s\n", av_err2str(ret)); > + goto fail; > + } > + > + ret = avio_open(&ofmt_ctx->pb, file, AVIO_FLAG_WRITE); > + if (ret < 0) { > + fprintf(stderr, "Cannot open output file. " > + "Error code: %s\n", av_err2str(ret)); > + goto fail; > + } > + > + /* write the stream header */ > + if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) { > + fprintf(stderr, "Error while writing stream header. " > + "Error code: %s\n", av_err2str(ret)); > + goto fail; > + } > + > + initialized = 1; > + } > + > + if ((ret = encode_write(frame)) < 0) > + fprintf(stderr, "Error during encoding and writing.\n"); > + > +fail: > + av_frame_free(&frame); > + if (ret < 0) > + return ret; > + } > + return 0; > +} > + > +int main(int argc, char **argv) { > + int ret = 0; > + AVPacket dec_pkt; > + AVCodec *enc_codec; > + > + if (argc != 4) { > + fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n" > + "The output format is guessed according to the file extension.\n" > + "\n", argv[0]); > + return -1; > + } > + > + av_register_all(); > + > + ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0); > + if (ret < 0) { > + fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret)); > + return -1; > + } > + > + if ((ret = open_input_file(argv[1])) < 0) > + goto end; > + > + if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) { > + fprintf(stderr, "Could not find encoder '%s'\n", argv[2]); > + ret = -1; > + goto end; > + } > + > + if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) { > + fprintf(stderr, "Failed to deduce output format from file extension. Error code: " > + "%s\n", av_err2str(ret)); > + goto end; > + } > + > + if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) { > + ret = AVERROR(ENOMEM); > + goto end; > + } > + > + /* read all packets and only transcoding video */ > + while (ret >= 0) { > + if ((ret = av_read_frame(ifmt_ctx, &dec_pkt)) < 0) > + break; > + > + if (video_stream == dec_pkt.stream_index) > + ret = dec_enc(&dec_pkt, enc_codec, argv[3]); > + > + av_packet_unref(&dec_pkt); > + } > + > + /* flush decoder */ > + dec_pkt.data = NULL; > + dec_pkt.size = 0; > + ret = dec_enc(&dec_pkt, enc_codec, argv[3]); > + av_packet_unref(&dec_pkt); > + > + /* flush encoder */ > + ret = encode_write(NULL); > + > + /* write the trailer for output stream */ > + av_write_trailer(ofmt_ctx); This encode/write step shouldn't be called if the output hasn't been opened. For example, if you give it a file which is valid but can't be decoded with VAAPI then you get a segfault here. > + > +end: > + avformat_close_input(&ifmt_ctx); > + avformat_close_input(&ofmt_ctx); > + avcodec_free_context(&decoder_ctx); > + avcodec_free_context(&encoder_ctx); > + av_buffer_unref(&hw_device_ctx); > + return ret; > +} > -- > 2.14.1 >
diff --git a/configure b/configure index fcfa7aa442..92aef31cbe 100755 --- a/configure +++ b/configure @@ -1526,6 +1526,7 @@ EXAMPLE_LIST=" transcode_aac_example transcoding_example vaapi_encode_example + vaapi_transcode_example " EXTERNAL_AUTODETECT_LIBRARY_LIST=" @@ -3320,6 +3321,7 @@ scaling_video_example_deps="avutil swscale" transcode_aac_example_deps="avcodec avformat swresample" transcoding_example_deps="avfilter avcodec avformat avutil" vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder" +vaapi_transcode_example_deps="avcodec avformat avutil" # EXTRALIBS_LIST cpu_init_extralibs="pthreads_extralibs" diff --git a/doc/examples/Makefile b/doc/examples/Makefile index da5af36532..928ff306b3 100644 --- a/doc/examples/Makefile +++ b/doc/examples/Makefile @@ -20,6 +20,7 @@ EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE) += scaling_video EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) += transcode_aac EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode +EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF)) EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF)) diff --git a/doc/examples/vaapi_transcode.c b/doc/examples/vaapi_transcode.c new file mode 100644 index 0000000000..af1550f5f2 --- /dev/null +++ b/doc/examples/vaapi_transcode.c @@ -0,0 +1,301 @@ +/* + * Video Acceleration API (video transcoding) transcode sample + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * Intel VAAPI-accelerated transcoding example. + * + * @example vaapi_transcode.c + * This example shows how to do VAAPI-accelerated transcoding. + * Usage: vaapi_transcode input_stream h264_vaapi output_stream + * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 + * - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf + */ + +#include <stdio.h> +#include <errno.h> + +#include <libavutil/hwcontext.h> +#include <libavcodec/avcodec.h> +#include <libavformat/avformat.h> + +static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL; +static AVBufferRef *hw_device_ctx = NULL; +static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL; +static int video_stream = -1; +static AVStream *ost; +static int initialized = 0; + +static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx, + const enum AVPixelFormat *pix_fmts) +{ + const enum AVPixelFormat *p; + + for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) { + if (*p == AV_PIX_FMT_VAAPI) + return *p; + } + + fprintf(stderr, "Unable to decode this file using VA-API.\n"); + return AV_PIX_FMT_NONE; +} + +static int open_input_file(const char *filename) +{ + int ret; + AVCodec *decoder = NULL; + AVStream *video = NULL; + + if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) { + fprintf(stderr, "Cannot open input file '%s', Error code: %s\n", + filename, av_err2str(ret)); + return ret; + } + + if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) { + fprintf(stderr, "Cannot find input stream information. Error code: %s\n", + av_err2str(ret)); + return ret; + } + + ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); + if (ret < 0) { + fprintf(stderr, "Cannot find a video stream in the input file. " + "Error code: %s\n", av_err2str(ret)); + return ret; + } + video_stream = ret; + + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) + return AVERROR(ENOMEM); + + video = ifmt_ctx->streams[video_stream]; + if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) { + fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n", + av_err2str(ret)); + return ret; + } + + decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); + decoder_ctx->get_format = get_vaapi_format; + + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) + fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n", + av_err2str(ret)); + + return ret; +} + +static int encode_write(AVFrame *frame) +{ + int ret = 0; + AVPacket enc_pkt; + + av_init_packet(&enc_pkt); + enc_pkt.data = NULL; + enc_pkt.size = 0; + + if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) { + fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret)); + goto end; + } + while (1) { + ret = avcodec_receive_packet(encoder_ctx, &enc_pkt); + if (ret) + break; + + enc_pkt.stream_index = 0; + av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base, + ofmt_ctx->streams[0]->time_base); + ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); + if (ret < 0) { + fprintf(stderr, "Error during writing data to output file. " + "Error code: %s\n", av_err2str(ret)); + return -1; + } + } + +end: + if (ret == AVERROR_EOF) + return 0; + ret = ((ret == AVERROR(EAGAIN)) ? 0:-1); + return ret; +} + +static int dec_enc(AVPacket *pkt, AVCodec *enc_codec, const char *file) +{ + AVFrame *frame; + int ret = 0; + + ret = avcodec_send_packet(decoder_ctx, pkt); + if (ret < 0) { + fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret)); + return ret; + } + + while (ret >= 0) { + if (!(frame = av_frame_alloc())) + return AVERROR(ENOMEM); + + ret = avcodec_receive_frame(decoder_ctx, frame); + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) { + av_frame_free(&frame); + return 0; + } else if (ret < 0) { + fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret)); + goto fail; + } + + if (!initialized) { + /* we need to ref hw_frames_ctx of decoder to initialize encoder's codec. + Only after we get a decoded frame, can we obtain its hw_frames_ctx */ + encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx); + if (!encoder_ctx->hw_frames_ctx) { + ret = AVERROR(ENOMEM); + goto fail; + } + /* set AVCodecContext Parameters for encoder, here we keep them stay + * the same as decoder. + * xxx: now the the sample can't handle resolution change case. + */ + encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate); + encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI; + encoder_ctx->width = decoder_ctx->width; + encoder_ctx->height = decoder_ctx->height; + + if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) { + fprintf(stderr, "Failed to open encode codec. Error code: %s\n", + av_err2str(ret)); + goto fail; + } + + if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) { + fprintf(stderr, "Failed to allocate stream for output format.\n"); + ret = AVERROR(ENOMEM); + goto fail; + } + + ost->time_base = encoder_ctx->time_base; + ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx); + if (ret < 0) { + fprintf(stderr, "Failed to copy the stream parameters. " + "Error code: %s\n", av_err2str(ret)); + goto fail; + } + + ret = avio_open(&ofmt_ctx->pb, file, AVIO_FLAG_WRITE); + if (ret < 0) { + fprintf(stderr, "Cannot open output file. " + "Error code: %s\n", av_err2str(ret)); + goto fail; + } + + /* write the stream header */ + if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) { + fprintf(stderr, "Error while writing stream header. " + "Error code: %s\n", av_err2str(ret)); + goto fail; + } + + initialized = 1; + } + + if ((ret = encode_write(frame)) < 0) + fprintf(stderr, "Error during encoding and writing.\n"); + +fail: + av_frame_free(&frame); + if (ret < 0) + return ret; + } + return 0; +} + +int main(int argc, char **argv) { + int ret = 0; + AVPacket dec_pkt; + AVCodec *enc_codec; + + if (argc != 4) { + fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n" + "The output format is guessed according to the file extension.\n" + "\n", argv[0]); + return -1; + } + + av_register_all(); + + ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0); + if (ret < 0) { + fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret)); + return -1; + } + + if ((ret = open_input_file(argv[1])) < 0) + goto end; + + if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) { + fprintf(stderr, "Could not find encoder '%s'\n", argv[2]); + ret = -1; + goto end; + } + + if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) { + fprintf(stderr, "Failed to deduce output format from file extension. Error code: " + "%s\n", av_err2str(ret)); + goto end; + } + + if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) { + ret = AVERROR(ENOMEM); + goto end; + } + + /* read all packets and only transcoding video */ + while (ret >= 0) { + if ((ret = av_read_frame(ifmt_ctx, &dec_pkt)) < 0) + break; + + if (video_stream == dec_pkt.stream_index) + ret = dec_enc(&dec_pkt, enc_codec, argv[3]); + + av_packet_unref(&dec_pkt); + } + + /* flush decoder */ + dec_pkt.data = NULL; + dec_pkt.size = 0; + ret = dec_enc(&dec_pkt, enc_codec, argv[3]); + av_packet_unref(&dec_pkt); + + /* flush encoder */ + ret = encode_write(NULL); + + /* write the trailer for output stream */ + av_write_trailer(ofmt_ctx); + +end: + avformat_close_input(&ifmt_ctx); + avformat_close_input(&ofmt_ctx); + avcodec_free_context(&decoder_ctx); + avcodec_free_context(&encoder_ctx); + av_buffer_unref(&hw_device_ctx); + return ret; +}