ffmpeg 中copy 参数表示不对源媒体进行转码，保留原始编码方式 m4a是音频封装（BOX），能封装mp3/aac编码...
* May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the * frame size is not restricted. * - decoding: may be set by some decoders to indicate constant frame size */intframe_size; 根据2,尝试设置 AV_CODEC_CAP_VARIABLE_FRAME_SIZE ,设置方式如下: audioCodec->capabi...
pCodec = avcodec_find_decoder(pCodecCtx->codec_id);//查找解码器 if (pCodec == NULL) { printf("Codec not found.\n"); return -1; } if (avcodec_open2(pCodecCtx, pCodec, NULL)<0) {//打开解码器 printf("Could not open codec.\n"); return -1; } /* * 在此处添加输出视频信息...
fprintf(stderr, "Could not open destination file %s\n", src_filename); exit(1); } /* create resampler context */ swr_ctx = swr_alloc(); if (!swr_ctx) { fprintf(stderr, "Could not allocate resampler context\n"); ret = AVERROR(ENOMEM); goto end; } /* set options */ av_...
// Set audio settings from codec info. wanted_spec.freq = aCodecCtx->sample_rate; wanted_spec.format = AUDIO_S16SYS; wanted_spec.channels = aCodecCtx->channels; wanted_spec.silence = 0; wanted_spec.samples = SDL_AUDIO_BUFFER_SIZE; ...
if ((ret = avcodec_parameters_copy(newStream->codecpar, stream->codecpar)) <0) { LOGD("avcodec_parameters_copy fail %s",av_err2str(ret)); return; } /** 遇到问题:mp4转换为avi时,播放提示“reference count 1 overflow,chroma_log2_weight_denom 1696 is out of range” ...
.id = AV_CODEC_ID_H264, ... }; h264 封装格式定义: h264 复用器(输出封装格式)定义: 1 2 3 4 5 6 7 8 9 10 11AVOutputFormat ff_h264_muxer = { .name ="h264", .long_name = NULL_IF_CONFIG_SMALL("raw H.264 video"), .extensions...
CodecCtx->frame_size,pCodecCtx->sample_fmt,1);frame_buf=(uint8_t*)av_malloc(size);//一次读取一帧音频的字节数readSize=frame->nb_samples*channels*sampleByte;char*buf=newchar[readSize];avcodec_fill_audio_frame(frame,pCodecCtx->channels,pCodecCtx->sample_fmt,(constuint8_t*)frame_buf,size...
ffmpeg编解码部分的功能主要是通过模块AVCodec来完成的,通过libavcodec库进行Encode与Decode操作。多媒体编码格式的种类有很多,但是还是有很多通用的基本操作参数设置,下面来详细介绍这些公用的参数。 通过命令ffmpeg --help full可以看到AVCodecContext参数列表信息。该选项下面的所有参数均为编解码可以使用的参数。
avconv -i'Video2.WMV'\-vcodec libx264 -preset ultrafast -profile:v baseline \-acodec aac -strict experimental \-r24-b 255k -ar44100-ab 59k'Video2.mp4' 'circular_buffer_size' option was set but it is not supported on this build (pthread support is requ ...