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ffmpeg: block output == input for files

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Fixes #4655
This commit is contained in:
Gyan Doshi 2018-08-26 11:22:50 +05:30
parent 5109c38162
commit acc9684dcd
1 changed files with 15 additions and 1 deletions
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16
fftools/ffmpeg_opt.c
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@ -900,13 +900,14 @@ static void add_input_streams(OptionsContext *o, AVFormatContext *ic)
static void assert_file_overwrite(const char *filename)
{
const char *proto_name = avio_find_protocol_name(filename);
if (file_overwrite && no_file_overwrite) {
fprintf(stderr, "Error, both -y and -n supplied. Exiting.\n");
exit_program(1);
}
if (!file_overwrite) {
const char *proto_name = avio_find_protocol_name(filename);
if (proto_name && !strcmp(proto_name, "file") && avio_check(filename, 0) == 0) {
if (stdin_interaction && !no_file_overwrite) {
fprintf(stderr,"File '%s' already exists. Overwrite ? [y/N] ", filename);
@ -925,6 +926,19 @@ static void assert_file_overwrite(const char *filename)
}
}
}
if (proto_name && !strcmp(proto_name, "file")) {
for (int i = 0; i < nb_input_files; i++) {
InputFile *file = input_files[i];
if (file->ctx->iformat->flags & AVFMT_NOFILE)
continue;
if (!strcmp(filename, file->ctx->url)) {
av_log(NULL, AV_LOG_FATAL, "Output %s same as Input #%d - exiting\n", filename, i);
av_log(NULL, AV_LOG_WARNING, "FFmpeg cannot edit existing files in-place.\n");
exit_program(1);
}
}
}
}
static void dump_attachment(AVStream *st, const char *filename)