Hi, there is a possible SIMPLE example that do a SIMPLE transcode from
h264/mlaw to mpeg4/aac?
I still have not yet found one that works (ffmpeg/transcode.c not work)
I post my code: there is a problem on avcodec_encode_audio2
-22 Invalid Argument (Input contains NaN)
I want to make code very simple, so I don’t want to use fifo_queue and more,
because the video type is only in one format (webcam)
Dump is correct:
Input #0, avi, from
'/Users/Shinnok/Library/Developer/Xcode/DerivedData/RainBlack-bamexxbsnwvvoqfegnzeexphynmr/Build/Products/Debug/camera.avi':
Duration: 00:00:11.60, start: 0.000000, bitrate: N/A
Stream #0:0: Video: h264 (Baseline) (h264 / 0x34363268), yuv420p(tv),
1280x720, 1003 kb/s, 15 fps, 15 tbr, 15 tbn, 30 tbc
Stream #0:1: Audio: pcm_mulaw ([7][0][0][0] / 0x0007), 8000 Hz, 1 channels,
s16, 64 kb/s
Output #0, mp4, to
'/Users/Shinnok/Library/Developer/Xcode/DerivedData/RainBlack-bamexxbsnwvvoqfegnzeexphynmr/Build/Products/Debug/output.mp4':
Metadata:
encoder : Lavf56.25.101
Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 1280x720, q=2-31,
1200 kb/s, 15360 tbn, 15 tbc
Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 8000 Hz, mono, fltp, 16
kb/s
(It’s in Objc)
Thanks,
Gabriele
__block struct AVFormatContext *inputCtx = NULL;
__block struct AVFormatContext *outputCtx = NULL;
__block int ret = 0;
__block void (^mainProcess)() = ^{
__block struct AVPacket packet;
__block struct AVFrame *frame;
while (true) {
if ((ret = av_read_frame(inputCtx, &packet)) < 0) {
break;
}
frame = av_frame_alloc();
unsigned int streamIdx = packet.stream_index;
int got_packet = 0;
av_packet_rescale_ts(&packet,
inputCtx->streams[streamIdx]->time_base,
inputCtx->streams[streamIdx]->codec->time_base);
enum AVMediaType type =
inputCtx->streams[streamIdx]->codec->codec_type;
int len = 0;
if (type == AVMEDIA_TYPE_VIDEO) {
NSLog(@"Decoded video");
len =
avcodec_decode_video2(inputCtx->streams[streamIdx]->codec, frame, &got_packet,
&packet);
} else if (type == AVMEDIA_TYPE_AUDIO) {
NSLog(@"Decoded audio");
len =
avcodec_decode_audio4(inputCtx->streams[streamIdx]->codec, frame, &got_packet,
&packet);
}
if (len < 0) {
av_frame_free(&frame);
av_log(NULL, AV_LOG_ERROR, "Decoding failed\n");
exit(1);
}
while (got_packet) {
NSLog(@"Encoding...");
AVPacket enc_pkt;
/* encode filtered frame */
enc_pkt.data = NULL;
enc_pkt.size = 0;
av_init_packet(&enc_pkt);
if (type == AVMEDIA_TYPE_VIDEO) {
NSLog(@"Encoding video");
if ((ret =
avcodec_encode_video2(outputCtx->streams[streamIdx]->codec, &enc_pkt, frame,
&got_packet)) < 0) {
av_frame_free(&frame);
exit(1);
}
} else {
NSLog(@"Encoding audio");
frame->pts =
av_frame_get_best_effort_timestamp(frame);
if ((ret =
avcodec_encode_audio2(outputCtx->streams[streamIdx]->codec, &enc_pkt, frame,
&got_packet)) < 0) {
NSLog(@"avcodec_encode_audio2
%s", av_err2str(ret));
av_frame_free(&frame);
exit(1);
}
}
while (got_packet) {
NSLog(@"Write packet");
/* prepare packet for muxing */
enc_pkt.stream_index = streamIdx;
av_packet_rescale_ts(&enc_pkt,
outputCtx->streams[streamIdx]->codec->time_base,
outputCtx->streams[streamIdx]->time_base);
av_log(NULL, AV_LOG_DEBUG, "Muxing
frame\n");
/* mux encoded frame */
ret =
av_interleaved_write_frame(outputCtx, &enc_pkt);
}
}
packet.data += len;
packet.size -= len;
av_frame_free(&frame);
}
av_write_trailer(outputCtx);
dispatch_async(callbackQueue, ^{
NSLog(@"FINISH");
});
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