There are a few problems with the code.
1. Use calloc not malloc initialising your structures2. You call encode_frame
ONCE at the end of your main while loop3. Code as it stands crashes with and
invalid index at line 269. Joolz
NOTE: Please start using [email protected] as this email account will be
closed on 31/12/2017
On Thursday, 7 December 2017, 1:41, Leandro Moreira
<[email protected]> wrote:
Hi there,
It turns out that I was sending the frames to the decoder format context
instead of the encoder context format. Anyway, I solved this and I'm seeing
some different messages, the file was generated but it can't be played on vlc,
although I can listen its sound.
The entire file is on github
https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/transcoding/2_transcoding.c
Questions:
1) How can I fix the yellow messages? (which I suppose are the warning level
log) or where should I keep my focus to fix? [libx264 @ 0x7faa4c801200] MB
rate (489600000) > level limit (2073600) (yellow) [mp4 @ 0x7faa4c800000] track
1: codec frame size is not set (yellow) [libx264 @ 0x7faa4c801200] forced
frame type (5) at 4 was changed to frame type (3)(yellow) [libx264 @
0x7faa4c801200] forced frame type (5) at 9 was changed to frame type
(3)(yellow) [libx264 @ 0x7faa4c801200] forced frame type (5) at 17 was changed
to frame type (3)(yellow)2) How can I send x264opts? (I tried
AVCodecContext->priv_data and it didn't work)
FFmpegLibAV messages
[libx264 @ 0x7faa4c801200] using SAR=1/1[libx264 @ 0x7faa4c801200] MB rate
(489600000) > level limit (2073600) (yellow)[libx264 @ 0x7faa4c801200] using
cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX[libx264 @ 0x7faa4c801200]
profile High, level 5.2[mp4 @ 0x7faa4c800000] track 1: codec frame size is not
set (yellow)
[libx264 @ 0x7faa4c801200] forced frame type (5) at 4 was changed to frame type
(3)(yellow)[libx264 @ 0x7faa4c801200] forced frame type (5) at 9 was changed to
frame type (3)(yellow)[libx264 @ 0x7faa4c801200] forced frame type (5) at 17
was changed to frame type (3)(yellow)
VLC message:
[000000010100a4b8] core decoder error: Could not convert timestamp
675061246497[000000010100a4b8] clock decoder error: Timestamp conversion failed
(delay 1000000, buffering 100000, bound 9000000)[000000010100a4b8] core decoder
error: Could not convert timestamp 675069579830[000000010100a4b8] clock decoder
error: Timestamp conversion failed (delay 1000000, buffering 100000, bound
9000000)[000000010100a4b8] core decoder error: Could not convert timestamp
675077913164
On Sun, Dec 3, 2017 at 10:39 PM Leandro Moreira
<[email protected]> wrote:
I'm trying to code a simple transcoder, using the new API, that replicates to
the following command line:
ffmpeg -i input.mp4 -c:v libx264 -x264-params
keyint=60:min-keyint=60:no-scenecut=1 -c:a copy output.mp4
I followed the transcoding example on Doxygen documentation but using the new
API.
My attempt to code it didn't work, either I get a single audio stream on an
mp4, that works, or a video stream on an mp4 that doesn't work.
I don't see any error message, the messages I see are these:
[libx264 @ 0x7fd0ae038000] using SAR=1/1[libx264 @ 0x7fd0ae038000] MB rate
(489600000) > level limit (2073600)[libx264 @ 0x7fd0ae038000] using cpu
capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX[libx264 @ 0x7fd0ae038000] profile
High, level 5.2
The whole file
https://github.com/leandromoreira/ffmpeg-libav-tutorial/blob/transcoding/2_transcoding.c
Anyway, what I did was:
I created a transcode context type:
typedef struct TrancodeContext {
char *file_name;
AVFormatContext *format_context;
int audio_stream_index;
int video_stream_index;
AVStream *stream[2];
AVCodec *codec[2];
AVCodecContext *codec_context[2];
} TranscodeContext;
Prepared the decoder with the functions:
- avformat_alloc_context,
- avformat_open_input,
- avformat_find_stream_info,
- avcodec_find_decoder,
- avcodec_alloc_context3,
- avcodec_parameters_to_context,
- avcodec_open2
Prepared the encoder with the functions:
- avformat_alloc_output_context2,
- avformat_new_stream,
- avcodec_find_encoder_by_name,
- avcodec_alloc_context3,
- avcodec_parameters_from_context,
- avcodec_find_encoder,
- avcodec_alloc_context3,
- avformat_new_stream,
- avcodec_open2,
- avcodec_parameters_from_context,
- avio_open,
- avformat_write_header
Read all the packets:
while (av_read_frame(decoder_context->format_context, input_packet) >= 0)
Decode the video packets into frames:
- avcodec_send_packet,
- avcodec_receive_frame
Encode the frame into the encoder:
- avcodec_send_frame,
- avcodec_receive_packet,
- av_packet_rescale_ts,
- av_interleaved_write_frame
Copy audio stream directly to the encoder:
- av_packet_rescale_ts,
- av_interleaved_write_frame
Finish with av_write_trailer
Can you see anything suspicious on that? I tried really hard
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